[JitDiff X64] [Copilot] Add ArrayBuilder.AddRange and use it instead of List ...

[MihuBot]

Job completed in 18 minutes (remote runner delay: 1 minute 31 seconds).

Using arguments: -NoPRLink

Diffs

Found 85 files with textual diffs.

Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 45954941
Total bytes of diff: 45962441
Total bytes of delta: 7500 (0.02 % of base)
Total relative delta: 8.68
    diff is a regression.
    relative diff is a regression.


Total byte diff includes 5942 bytes from reconciling methods
	Base had    0 unique methods,        0 unique bytes
	Diff had    8 unique methods,     5942 unique bytes

Top file regressions (bytes):
        7060 : System.Private.CoreLib.dasm (0.09 % of base)
         309 : System.IO.Ports.dasm (0.61 % of base)
          66 : System.IO.IsolatedStorage.dasm (0.29 % of base)
          65 : System.Diagnostics.Process.dasm (0.06 % of base)

4 total files with Code Size differences (0 improved, 4 regressed), 256 unchanged.

Top method regressions (bytes):
        1040 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this (FullOpts) (0 base, 1 diff methods)
         730 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[System.Numerics.Vector`1[float]]:AddRange(System.Collections.Generic.IEnumerable`1[System.Numerics.Vector`1[float]]):this (FullOpts) (0 base, 1 diff methods)
         704 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[System.Nullable`1[int]]:AddRange(System.Collections.Generic.IEnumerable`1[System.Nullable`1[int]]):this (FullOpts) (0 base, 1 diff methods)
         702 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[double]:AddRange(System.Collections.Generic.IEnumerable`1[double]):this (FullOpts) (0 base, 1 diff methods)
         693 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[short]:AddRange(System.Collections.Generic.IEnumerable`1[short]):this (FullOpts) (0 base, 1 diff methods)
         691 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[byte]:AddRange(System.Collections.Generic.IEnumerable`1[byte]):this (FullOpts) (0 base, 1 diff methods)
         691 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[int]:AddRange(System.Collections.Generic.IEnumerable`1[int]):this (FullOpts) (0 base, 1 diff methods)
         691 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[long]:AddRange(System.Collections.Generic.IEnumerable`1[long]):this (FullOpts) (0 base, 1 diff methods)
         158 (25.28 % of base) : System.IO.Ports.dasm - System.IO.Ports.SerialPort:GetPortNames_OSX():System.String[] (FullOpts)
         151 (20.63 % of base) : System.IO.Ports.dasm - System.IO.Ports.SerialPort:GetPortNames_FreeBSD():System.String[] (FullOpts)
         120 (101.69 % of base) : System.Private.CoreLib.dasm - System.Threading.TimerQueue+TimerQueueDebuggerTypeProxy:get_Items():System.Threading.TimerQueueTimer[]:this (FullOpts)
         108 (63.91 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetFileSystemInfos():System.IO.FileSystemInfo[]:this (FullOpts)
         104 (52.53 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetDirectories():System.IO.DirectoryInfo[]:this (FullOpts)
         104 (52.53 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetFiles():System.IO.FileInfo[]:this (FullOpts)
         102 (74.45 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetDirectories(System.String,System.IO.EnumerationOptions):System.IO.DirectoryInfo[]:this (FullOpts)
         102 (74.45 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetFiles(System.String,System.IO.EnumerationOptions):System.IO.FileInfo[]:this (FullOpts)
         102 (91.07 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetFileSystemInfos(System.String,System.IO.EnumerationOptions):System.IO.FileSystemInfo[]:this (FullOpts)
          69 (41.82 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetDirectories(System.String):System.String[] (FullOpts)
          69 (41.82 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetFiles(System.String):System.String[] (FullOpts)
          69 (41.82 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetFileSystemEntries(System.String):System.String[] (FullOpts)
          66 (11.60 % of base) : System.IO.IsolatedStorage.dasm - System.IO.IsolatedStorage.Helper:GetExistingRandomDirectory(System.String):System.String (FullOpts)
          65 (21.89 % of base) : System.Diagnostics.Process.dasm - System.Diagnostics.Process:EnsureHandleCountPopulated():this (FullOpts)
          54 (50.00 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetDirectories(System.String,System.String,System.IO.EnumerationOptions):System.String[] (FullOpts)
          54 (50.00 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetFiles(System.String,System.String,System.IO.EnumerationOptions):System.String[] (FullOpts)
          54 (50.00 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetFileSystemEntries(System.String,System.String,System.IO.EnumerationOptions):System.String[] (FullOpts)
           7 (2.83 % of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[System.__Canon]:ToArray():System.__Canon[]:this (FullOpts)

Top method regressions (percentages):
         691 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[byte]:AddRange(System.Collections.Generic.IEnumerable`1[byte]):this (FullOpts) (0 base, 1 diff methods)
         702 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[double]:AddRange(System.Collections.Generic.IEnumerable`1[double]):this (FullOpts) (0 base, 1 diff methods)
         691 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[int]:AddRange(System.Collections.Generic.IEnumerable`1[int]):this (FullOpts) (0 base, 1 diff methods)
         691 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[long]:AddRange(System.Collections.Generic.IEnumerable`1[long]):this (FullOpts) (0 base, 1 diff methods)
         693 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[short]:AddRange(System.Collections.Generic.IEnumerable`1[short]):this (FullOpts) (0 base, 1 diff methods)
        1040 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this (FullOpts) (0 base, 1 diff methods)
         704 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[System.Nullable`1[int]]:AddRange(System.Collections.Generic.IEnumerable`1[System.Nullable`1[int]]):this (FullOpts) (0 base, 1 diff methods)
         730 (Infinity of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[System.Numerics.Vector`1[float]]:AddRange(System.Collections.Generic.IEnumerable`1[System.Numerics.Vector`1[float]]):this (FullOpts) (0 base, 1 diff methods)
         120 (101.69 % of base) : System.Private.CoreLib.dasm - System.Threading.TimerQueue+TimerQueueDebuggerTypeProxy:get_Items():System.Threading.TimerQueueTimer[]:this (FullOpts)
         102 (91.07 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetFileSystemInfos(System.String,System.IO.EnumerationOptions):System.IO.FileSystemInfo[]:this (FullOpts)
         102 (74.45 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetDirectories(System.String,System.IO.EnumerationOptions):System.IO.DirectoryInfo[]:this (FullOpts)
         102 (74.45 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetFiles(System.String,System.IO.EnumerationOptions):System.IO.FileInfo[]:this (FullOpts)
         108 (63.91 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetFileSystemInfos():System.IO.FileSystemInfo[]:this (FullOpts)
         104 (52.53 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetDirectories():System.IO.DirectoryInfo[]:this (FullOpts)
         104 (52.53 % of base) : System.Private.CoreLib.dasm - System.IO.DirectoryInfo:GetFiles():System.IO.FileInfo[]:this (FullOpts)
          54 (50.00 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetDirectories(System.String,System.String,System.IO.EnumerationOptions):System.String[] (FullOpts)
          54 (50.00 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetFiles(System.String,System.String,System.IO.EnumerationOptions):System.String[] (FullOpts)
          54 (50.00 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetFileSystemEntries(System.String,System.String,System.IO.EnumerationOptions):System.String[] (FullOpts)
          69 (41.82 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetDirectories(System.String):System.String[] (FullOpts)
          69 (41.82 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetFiles(System.String):System.String[] (FullOpts)
          69 (41.82 % of base) : System.Private.CoreLib.dasm - System.IO.Directory:GetFileSystemEntries(System.String):System.String[] (FullOpts)
         158 (25.28 % of base) : System.IO.Ports.dasm - System.IO.Ports.SerialPort:GetPortNames_OSX():System.String[] (FullOpts)
          65 (21.89 % of base) : System.Diagnostics.Process.dasm - System.Diagnostics.Process:EnsureHandleCountPopulated():this (FullOpts)
         151 (20.63 % of base) : System.IO.Ports.dasm - System.IO.Ports.SerialPort:GetPortNames_FreeBSD():System.String[] (FullOpts)
          66 (11.60 % of base) : System.IO.IsolatedStorage.dasm - System.IO.IsolatedStorage.Helper:GetExistingRandomDirectory(System.String):System.String (FullOpts)
           7 (2.83 % of base) : System.Private.CoreLib.dasm - System.Collections.Generic.ArrayBuilder`1[System.__Canon]:ToArray():System.__Canon[]:this (FullOpts)

26 total methods with Code Size differences (0 improved, 26 regressed), 283141 unchanged.

--------------------------------------------------------------------------------

Artifacts:

• build-clr-checked-main.zip (87 MB)
• build-artifacts-main.zip (698 MB)
• build-clr-checked-pr.zip (87 MB)
• build-artifacts-pr.zip (699 MB)
• jit-diffs-main.zip (154 MB)
• jit-diffs-pr.zip (154 MB)
• diff-frameworks.txt (10 KB)
• ShortDiffsRegressions.md (57 KB)
• LongDiffsRegressions.md (183 KB)

[MihuBot]

Top method regressions

120 (101.69 % of base) - System.Threading.TimerQueue+TimerQueueDebuggerTypeProxy:get_Items():System.Threading.TimerQueueTimer[]:this

 ; Assembly listing for method System.Threading.TimerQueue+TimerQueueDebuggerTypeProxy:get_Items():System.Threading.TimerQueueTimer[]:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
+; 0 inlinees with PGO data; 4 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T03] (  3,  3   )     ref  ->  rdi         this class-hnd single-def <System.Threading.TimerQueue+TimerQueueDebuggerTypeProxy>
-;# V01 OutArgs      [V01    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
-;  V02 tmp1         [V02,T01] (  3,  6   )     ref  ->  rbx         class-hnd exact single-def "NewObj constructor temp" <System.Collections.Generic.List`1[System.Threading.TimerQueueTimer]>
-;  V03 tmp2         [V03,T00] (  5, 10   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.Threading.TimerQueue+<GetTimersForDebugger>d__7>
-;  V04 tmp3         [V04,T02] (  3,  6   )     ref  ->  rbx         class-hnd exact single-def "Inlining Arg" <System.Threading.TimerQueue>
+;  V00 this         [V00,T02] (  3,  3   )     ref  ->  rdi         this class-hnd single-def <System.Threading.TimerQueue+TimerQueueDebuggerTypeProxy>
+;  V01 loc0         [V01    ] (  8,  5.50)  struct (16) [rbp-0x20]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.ArrayBuilder`1[System.Threading.TimerQueueTimer]>
+;# V02 OutArgs      [V02    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
+;  V03 tmp1         [V03,T00] (  5, 10   )     ref  ->  r15         class-hnd exact single-def "NewObj constructor temp" <System.Threading.TimerQueue+<GetTimersForDebugger>d__7>
+;  V04 tmp2         [V04,T01] (  3,  6   )     ref  ->  rbx         class-hnd exact single-def "Inlining Arg" <System.Threading.TimerQueue>
+;  V05 tmp3         [V05,T04] (  3,  2   )     ref  ->  rbx         class-hnd exact "Inline return value spill temp" <System.Threading.TimerQueueTimer[]>
+;  V06 tmp4         [V06,T03] (  5,  2.50)     ref  ->  rbx         class-hnd "Inline stloc first use temp" <System.Threading.TimerQueueTimer[]>
+;* V07 tmp5         [V07    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "NewArr temp" <System.Threading.TimerQueueTimer[]>
+;  V08 tmp6         [V08    ] (  4,  3   )     ref  ->  [rbp-0x20]  do-not-enreg[X] addr-exposed "field V01._array (fldOffset=0x0)" P-DEP
+;  V09 tmp7         [V09    ] (  6,  4.50)     int  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed "field V01._count (fldOffset=0x8)" P-DEP
 ;
-; Lcl frame size = 0
+; Lcl frame size = 16
 
 G_M47681_IG01:
        push     rbp
        push     r15
        push     rbx
-       lea      rbp, [rsp+0x10]
-						;; size=9 bbWeight=1 PerfScore 3.50
+       sub      rsp, 16
+       lea      rbp, [rsp+0x20]
+       xor      eax, eax
+       mov      qword ptr [rbp-0x20], rax
+						;; size=19 bbWeight=1 PerfScore 5.00
 G_M47681_IG02:
+       vxorps   xmm0, xmm0, xmm0
+       vmovdqu  xmmword ptr [rbp-0x20], xmm0
        mov      rbx, gword ptr [rdi+0x08]
        cmp      byte  ptr [rbx], bl
        mov      rdi, 0xD1FFAB1E      ; System.Threading.TimerQueue+<GetTimersForDebugger>d__7
        call     CORINFO_HELP_NEWSFAST
        mov      r15, rax
        mov      dword ptr [r15+0x20], -2
        call     System.Environment:get_CurrentManagedThreadId():int
        mov      dword ptr [r15+0x24], eax
        lea      rdi, bword ptr [r15+0x10]
        mov      rsi, rbx
        call     CORINFO_HELP_ASSIGN_REF
-       mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.List`1[System.Threading.TimerQueueTimer]
-       call     CORINFO_HELP_NEWSFAST
-       mov      rbx, rax
-       mov      rdi, rbx
-       mov      rsi, r15
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       call     [rax]System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       mov      rdi, rbx
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=102 bbWeight=1 PerfScore 17.00
+       lea      rdi, [rbp-0x20]
+       mov      rdx, r15
+       mov      rsi, 0xD1FFAB1E      ; System.Collections.Generic.ArrayBuilder`1[System.Threading.TimerQueueTimer]
+       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       call     [rax]System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       cmp      dword ptr [rbp-0x18], 0
+       je       SHORT G_M47681_IG05
+						;; size=97 bbWeight=1 PerfScore 19.83
 G_M47681_IG03:
+       mov      rbx, gword ptr [rbp-0x20]
+       mov      esi, dword ptr [rbp-0x18]
+       cmp      esi, dword ptr [rbx+0x08]
+       jge      SHORT G_M47681_IG04
+       movsxd   rsi, dword ptr [rbp-0x18]
+       mov      rdi, 0xD1FFAB1E      ; System.Threading.TimerQueueTimer[]
+       call     CORINFO_HELP_NEWARR_1_PTR
+       mov      rbx, rax
+       mov      rdi, gword ptr [rbp-0x20]
+       mov      rsi, rbx
+       mov      edx, dword ptr [rbp-0x18]
+       mov      rax, 0xD1FFAB1E      ; code for System.Array:Copy(System.Array,System.Array,int)
+       call     [rax]System.Array:Copy(System.Array,System.Array,int)
+						;; size=56 bbWeight=0.50 PerfScore 8.00
+G_M47681_IG04:
+       jmp      SHORT G_M47681_IG07
+						;; size=2 bbWeight=0.50 PerfScore 1.00
+G_M47681_IG05:
+       mov      rdi, 0xD1FFAB1E      ; global ptr
+       test     byte  ptr [rdi], 1
+       je       SHORT G_M47681_IG09
+						;; size=15 bbWeight=0.50 PerfScore 2.12
+G_M47681_IG06:
+       mov      rax, 0xD1FFAB1E      ; data for System.Array+EmptyArray`1[System.Threading.TimerQueueTimer]:Value
+       mov      rbx, gword ptr [rax]
+						;; size=13 bbWeight=0.50 PerfScore 1.12
+G_M47681_IG07:
+       mov      rax, rbx
+						;; size=3 bbWeight=1 PerfScore 0.25
+G_M47681_IG08:
+       add      rsp, 16
        pop      rbx
        pop      r15
        pop      rbp
-       tail.jmp [rax]System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=7 bbWeight=1 PerfScore 5.50
+       ret      
+						;; size=9 bbWeight=1 PerfScore 2.75
+G_M47681_IG09:
+       mov      rdi, 0xD1FFAB1E      ; System.Array+EmptyArray`1[System.Threading.TimerQueueTimer]
+       mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_GET_GCSTATIC_BASE
+       call     [rax]CORINFO_HELP_GET_GCSTATIC_BASE
+       jmp      SHORT G_M47681_IG06
+						;; size=24 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 118, prolog size 9, PerfScore 26.00, instruction count 28, allocated bytes for code 118 (MethodHash=e1f445be) for method System.Threading.TimerQueue+TimerQueueDebuggerTypeProxy:get_Items():System.Threading.TimerQueueTimer[]:this (FullOpts)
+; Total bytes of code 238, prolog size 19, PerfScore 40.08, instruction count 56, allocated bytes for code 238 (MethodHash=e1f445be) for method System.Threading.TimerQueue+TimerQueueDebuggerTypeProxy:get_Items():System.Threading.TimerQueueTimer[]:this (FullOpts)
 ; ============================================================

108 (63.91 % of base) - System.IO.DirectoryInfo:GetFileSystemInfos():System.IO.FileSystemInfo[]:this

 ; Assembly listing for method System.IO.DirectoryInfo:GetFileSystemInfos():System.IO.FileSystemInfo[]:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 2 single block inlinees; 0 inlinees without PGO data
+; 0 inlinees with PGO data; 3 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T00] (  4,  4   )     ref  ->  rbx         this class-hnd single-def <System.IO.DirectoryInfo>
 ;# V01 OutArgs      [V01    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
-;  V02 tmp1         [V02,T02] (  2,  4   )     ref  ->  r15         class-hnd single-def "Inlining Arg" <System.IO.EnumerationOptions>
-;  V03 tmp2         [V03,T01] (  3,  6   )     ref  ->  r14         class-hnd exact single-def "NewObj constructor temp" <System.Collections.Generic.List`1[System.IO.FileSystemInfo]>
-;  V04 tmp3         [V04,T03] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
+;  V02 tmp1         [V02    ] (  8,  5.50)  struct (16) [rbp-0x18]  do-not-enreg[XS] must-init addr-exposed ld-addr-op "Inline ldloca(s) first use temp" <System.Collections.Generic.ArrayBuilder`1[System.IO.FileSystemInfo]>
+;  V03 tmp2         [V03,T01] (  2,  4   )     ref  ->   r8         class-hnd single-def "Inlining Arg" <System.IO.EnumerationOptions>
+;  V04 tmp3         [V04,T04] (  3,  2   )     ref  ->  rbx         class-hnd "Inline return value spill temp" <System.IO.FileSystemInfo[]>
+;  V05 tmp4         [V05,T03] (  5,  2.50)     ref  ->  rbx         class-hnd "Inline stloc first use temp" <System.IO.FileSystemInfo[]>
+;* V06 tmp5         [V06    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "NewArr temp" <System.IO.FileSystemInfo[]>
+;  V07 tmp6         [V07    ] (  4,  3   )     ref  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed "field V02._array (fldOffset=0x0)" P-DEP
+;  V08 tmp7         [V08    ] (  6,  4.50)     int  ->  [rbp-0x10]  do-not-enreg[X] addr-exposed "field V02._count (fldOffset=0x8)" P-DEP
+;  V09 tmp8         [V09,T02] (  2,  4   )     ref  ->  rdx         single-def "argument with side effect"
 ;
-; Lcl frame size = 8
+; Lcl frame size = 24
 
 G_M51267_IG01:
        push     rbp
-       push     r15
-       push     r14
        push     rbx
-       push     rax
+       sub      rsp, 24
        lea      rbp, [rsp+0x20]
+       xor      eax, eax
+       mov      qword ptr [rbp-0x18], rax
        mov      rbx, rdi
-						;; size=15 bbWeight=1 PerfScore 5.75
+						;; size=20 bbWeight=1 PerfScore 4.25
 G_M51267_IG02:
        mov      rdi, 0xD1FFAB1E      ; global ptr
        test     byte  ptr [rdi], 1
-       je       SHORT G_M51267_IG05
-						;; size=15 bbWeight=1 PerfScore 4.25
+       je       G_M51267_IG10
+						;; size=19 bbWeight=1 PerfScore 4.25
 G_M51267_IG03:
-       mov      rdi, 0xD1FFAB1E      ; data for System.IO.EnumerationOptions:<Compatible>k__BackingField
-       mov      r15, gword ptr [rdi]
-       mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.List`1[System.IO.FileSystemInfo]
-       call     CORINFO_HELP_NEWSFAST
-       mov      r14, rax
+       mov      rsi, 0xD1FFAB1E      ; data for System.IO.EnumerationOptions:<Compatible>k__BackingField
+       mov      r8, gword ptr [rsi]
+       vxorps   xmm0, xmm0, xmm0
+       vmovdqu  xmmword ptr [rbp-0x18], xmm0
        mov      rsi, gword ptr [rbx+0x08]
        mov      rdi, rbx
-       mov      r8, r15
        mov      rdx, 0xD1FFAB1E      ; '*'
        mov      ecx, 3
        mov      rax, 0xD1FFAB1E      ; code for System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
        call     [rax]System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
-       mov      rsi, rax
-       mov      rdi, r14
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       call     [rax]System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       mov      rdi, r14
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=99 bbWeight=1 PerfScore 14.25
+       mov      rdx, rax
+       lea      rdi, [rbp-0x18]
+       mov      rsi, 0xD1FFAB1E      ; System.Collections.Generic.ArrayBuilder`1[System.IO.FileSystemInfo]
+       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       call     [rax]System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       cmp      dword ptr [rbp-0x10], 0
+       je       SHORT G_M51267_IG06
+						;; size=91 bbWeight=1 PerfScore 16.83
 G_M51267_IG04:
-       add      rsp, 8
-       pop      rbx
-       pop      r14
-       pop      r15
-       pop      rbp
-       tail.jmp [rax]System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=13 bbWeight=1 PerfScore 6.25
+       mov      rbx, gword ptr [rbp-0x18]
+       mov      esi, dword ptr [rbp-0x10]
+       cmp      esi, dword ptr [rbx+0x08]
+       jge      SHORT G_M51267_IG05
+       movsxd   rsi, dword ptr [rbp-0x10]
+       mov      rdi, 0xD1FFAB1E      ; System.IO.FileSystemInfo[]
+       call     CORINFO_HELP_NEWARR_1_PTR
+       mov      rbx, rax
+       mov      rdi, gword ptr [rbp-0x18]
+       mov      rsi, rbx
+       mov      edx, dword ptr [rbp-0x10]
+       mov      rax, 0xD1FFAB1E      ; code for System.Array:Copy(System.Array,System.Array,int)
+       call     [rax]System.Array:Copy(System.Array,System.Array,int)
+						;; size=56 bbWeight=0.50 PerfScore 8.00
 G_M51267_IG05:
+       jmp      SHORT G_M51267_IG08
+						;; size=2 bbWeight=0.50 PerfScore 1.00
+G_M51267_IG06:
+       mov      rdi, 0xD1FFAB1E      ; global ptr
+       test     byte  ptr [rdi], 1
+       je       SHORT G_M51267_IG11
+						;; size=15 bbWeight=0.50 PerfScore 2.12
+G_M51267_IG07:
+       mov      rax, 0xD1FFAB1E      ; data for System.Array+EmptyArray`1[System.IO.FileSystemInfo]:Value
+       mov      rbx, gword ptr [rax]
+						;; size=13 bbWeight=0.50 PerfScore 1.12
+G_M51267_IG08:
+       mov      rax, rbx
+						;; size=3 bbWeight=1 PerfScore 0.25
+G_M51267_IG09:
+       add      rsp, 24
+       pop      rbx
+       pop      rbp
+       ret      
+						;; size=7 bbWeight=1 PerfScore 2.25
+G_M51267_IG10:
        mov      rdi, 0xD1FFAB1E      ; System.IO.EnumerationOptions
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_GET_GCSTATIC_BASE
        call     [rax]CORINFO_HELP_GET_GCSTATIC_BASE
        jmp      G_M51267_IG03
 						;; size=27 bbWeight=0 PerfScore 0.00
+G_M51267_IG11:
+       mov      rdi, 0xD1FFAB1E      ; System.Array+EmptyArray`1[System.IO.FileSystemInfo]
+       mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_GET_GCSTATIC_BASE
+       call     [rax]CORINFO_HELP_GET_GCSTATIC_BASE
+       jmp      SHORT G_M51267_IG07
+						;; size=24 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 169, prolog size 12, PerfScore 30.50, instruction count 38, allocated bytes for code 169 (MethodHash=84ba37bc) for method System.IO.DirectoryInfo:GetFileSystemInfos():System.IO.FileSystemInfo[]:this (FullOpts)
+; Total bytes of code 277, prolog size 17, PerfScore 40.08, instruction count 59, allocated bytes for code 277 (MethodHash=84ba37bc) for method System.IO.DirectoryInfo:GetFileSystemInfos():System.IO.FileSystemInfo[]:this (FullOpts)
 ; ============================================================

104 (52.53 % of base) - System.IO.DirectoryInfo:GetDirectories():System.IO.DirectoryInfo[]:this

 ; Assembly listing for method System.IO.DirectoryInfo:GetDirectories():System.IO.DirectoryInfo[]:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 2 single block inlinees; 0 inlinees without PGO data
+; 0 inlinees with PGO data; 3 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T00] (  4,  4   )     ref  ->  rbx         this class-hnd single-def <System.IO.DirectoryInfo>
 ;# V01 OutArgs      [V01    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
-;  V02 tmp1         [V02,T02] (  2,  4   )     ref  ->  r15         class-hnd single-def "Inlining Arg" <System.IO.EnumerationOptions>
-;  V03 tmp2         [V03,T01] (  3,  6   )     ref  ->  r14         class-hnd exact single-def "NewObj constructor temp" <System.Collections.Generic.List`1[System.IO.DirectoryInfo]>
-;  V04 tmp3         [V04,T03] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
-;  V05 tmp4         [V05,T04] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
+;  V02 tmp1         [V02    ] (  8,  5.50)  struct (16) [rbp-0x18]  do-not-enreg[XS] must-init addr-exposed ld-addr-op "Inline ldloca(s) first use temp" <System.Collections.Generic.ArrayBuilder`1[System.IO.DirectoryInfo]>
+;  V03 tmp2         [V03,T01] (  2,  4   )     ref  ->   r8         class-hnd single-def "Inlining Arg" <System.IO.EnumerationOptions>
+;  V04 tmp3         [V04,T05] (  3,  2   )     ref  ->  rbx         class-hnd exact "Inline return value spill temp" <System.IO.DirectoryInfo[]>
+;  V05 tmp4         [V05,T04] (  5,  2.50)     ref  ->  rbx         class-hnd "Inline stloc first use temp" <System.IO.DirectoryInfo[]>
+;* V06 tmp5         [V06    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "NewArr temp" <System.IO.DirectoryInfo[]>
+;  V07 tmp6         [V07    ] (  4,  3   )     ref  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed "field V02._array (fldOffset=0x0)" P-DEP
+;  V08 tmp7         [V08    ] (  6,  4.50)     int  ->  [rbp-0x10]  do-not-enreg[X] addr-exposed "field V02._count (fldOffset=0x8)" P-DEP
+;  V09 tmp8         [V09,T02] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
+;  V10 tmp9         [V10,T03] (  2,  4   )     ref  ->  rdx         single-def "argument with side effect"
 ;
-; Lcl frame size = 8
+; Lcl frame size = 24
 
 G_M64888_IG01:
        push     rbp
-       push     r15
-       push     r14
        push     rbx
-       push     rax
+       sub      rsp, 24
        lea      rbp, [rsp+0x20]
+       xor      eax, eax
+       mov      qword ptr [rbp-0x18], rax
        mov      rbx, rdi
-						;; size=15 bbWeight=1 PerfScore 5.75
+						;; size=20 bbWeight=1 PerfScore 4.25
 G_M64888_IG02:
        mov      rdi, 0xD1FFAB1E      ; global ptr
        test     byte  ptr [rdi], 1
-       je       G_M64888_IG05
+       je       G_M64888_IG10
 						;; size=19 bbWeight=1 PerfScore 4.25
 G_M64888_IG03:
-       mov      rdi, 0xD1FFAB1E      ; data for System.IO.EnumerationOptions:<Compatible>k__BackingField
-       mov      r15, gword ptr [rdi]
-       mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.List`1[System.IO.DirectoryInfo]
-       call     CORINFO_HELP_NEWSFAST
-       mov      r14, rax
+       mov      rsi, 0xD1FFAB1E      ; data for System.IO.EnumerationOptions:<Compatible>k__BackingField
+       mov      r8, gword ptr [rsi]
+       vxorps   xmm0, xmm0, xmm0
+       vmovdqu  xmmword ptr [rbp-0x18], xmm0
        mov      rsi, gword ptr [rbx+0x08]
        mov      rdi, rbx
-       mov      r8, r15
        mov      rdx, 0xD1FFAB1E      ; '*'
        mov      ecx, 2
        mov      rax, 0xD1FFAB1E      ; code for System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
        call     [rax]System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
        mov      rsi, rax
        mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.IEnumerable`1[System.IO.DirectoryInfo]
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_CHKCASTANY
        call     [rax]CORINFO_HELP_CHKCASTANY
-       mov      rsi, rax
-       mov      rdi, r14
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       call     [rax]System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       mov      rdi, r14
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=124 bbWeight=1 PerfScore 18.00
+       mov      rdx, rax
+       lea      rdi, [rbp-0x18]
+       mov      rsi, 0xD1FFAB1E      ; System.Collections.Generic.ArrayBuilder`1[System.IO.DirectoryInfo]
+       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       call     [rax]System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       cmp      dword ptr [rbp-0x10], 0
+       je       SHORT G_M64888_IG06
+						;; size=116 bbWeight=1 PerfScore 20.58
 G_M64888_IG04:
-       add      rsp, 8
-       pop      rbx
-       pop      r14
-       pop      r15
-       pop      rbp
-       tail.jmp [rax]System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=13 bbWeight=1 PerfScore 6.25
+       mov      rbx, gword ptr [rbp-0x18]
+       mov      esi, dword ptr [rbp-0x10]
+       cmp      esi, dword ptr [rbx+0x08]
+       jge      SHORT G_M64888_IG05
+       movsxd   rsi, dword ptr [rbp-0x10]
+       mov      rdi, 0xD1FFAB1E      ; System.IO.DirectoryInfo[]
+       call     CORINFO_HELP_NEWARR_1_PTR
+       mov      rbx, rax
+       mov      rdi, gword ptr [rbp-0x18]
+       mov      rsi, rbx
+       mov      edx, dword ptr [rbp-0x10]
+       mov      rax, 0xD1FFAB1E      ; code for System.Array:Copy(System.Array,System.Array,int)
+       call     [rax]System.Array:Copy(System.Array,System.Array,int)
+						;; size=56 bbWeight=0.50 PerfScore 8.00
 G_M64888_IG05:
+       jmp      SHORT G_M64888_IG08
+						;; size=2 bbWeight=0.50 PerfScore 1.00
+G_M64888_IG06:
+       mov      rdi, 0xD1FFAB1E      ; global ptr
+       test     byte  ptr [rdi], 1
+       je       SHORT G_M64888_IG11
+						;; size=15 bbWeight=0.50 PerfScore 2.12
+G_M64888_IG07:
+       mov      rax, 0xD1FFAB1E      ; data for System.Array+EmptyArray`1[System.IO.DirectoryInfo]:Value
+       mov      rbx, gword ptr [rax]
+						;; size=13 bbWeight=0.50 PerfScore 1.12
+G_M64888_IG08:
+       mov      rax, rbx
+						;; size=3 bbWeight=1 PerfScore 0.25
+G_M64888_IG09:
+       add      rsp, 24
+       pop      rbx
+       pop      rbp
+       ret      
+						;; size=7 bbWeight=1 PerfScore 2.25
+G_M64888_IG10:
        mov      rdi, 0xD1FFAB1E      ; System.IO.EnumerationOptions
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_GET_GCSTATIC_BASE
        call     [rax]CORINFO_HELP_GET_GCSTATIC_BASE
        jmp      G_M64888_IG03
 						;; size=27 bbWeight=0 PerfScore 0.00
+G_M64888_IG11:
+       mov      rdi, 0xD1FFAB1E      ; System.Array+EmptyArray`1[System.IO.DirectoryInfo]
+       mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_GET_GCSTATIC_BASE
+       call     [rax]CORINFO_HELP_GET_GCSTATIC_BASE
+       jmp      SHORT G_M64888_IG07
+						;; size=24 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 198, prolog size 12, PerfScore 34.25, instruction count 42, allocated bytes for code 198 (MethodHash=6c3b0287) for method System.IO.DirectoryInfo:GetDirectories():System.IO.DirectoryInfo[]:this (FullOpts)
+; Total bytes of code 302, prolog size 17, PerfScore 43.83, instruction count 63, allocated bytes for code 302 (MethodHash=6c3b0287) for method System.IO.DirectoryInfo:GetDirectories():System.IO.DirectoryInfo[]:this (FullOpts)
 ; ============================================================

104 (52.53 % of base) - System.IO.DirectoryInfo:GetFiles():System.IO.FileInfo[]:this

 ; Assembly listing for method System.IO.DirectoryInfo:GetFiles():System.IO.FileInfo[]:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 2 single block inlinees; 0 inlinees without PGO data
+; 0 inlinees with PGO data; 3 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T00] (  4,  4   )     ref  ->  rbx         this class-hnd single-def <System.IO.DirectoryInfo>
 ;# V01 OutArgs      [V01    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
-;  V02 tmp1         [V02,T02] (  2,  4   )     ref  ->  r15         class-hnd single-def "Inlining Arg" <System.IO.EnumerationOptions>
-;  V03 tmp2         [V03,T01] (  3,  6   )     ref  ->  r14         class-hnd exact single-def "NewObj constructor temp" <System.Collections.Generic.List`1[System.IO.FileInfo]>
-;  V04 tmp3         [V04,T03] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
-;  V05 tmp4         [V05,T04] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
+;  V02 tmp1         [V02    ] (  8,  5.50)  struct (16) [rbp-0x18]  do-not-enreg[XS] must-init addr-exposed ld-addr-op "Inline ldloca(s) first use temp" <System.Collections.Generic.ArrayBuilder`1[System.IO.FileInfo]>
+;  V03 tmp2         [V03,T01] (  2,  4   )     ref  ->   r8         class-hnd single-def "Inlining Arg" <System.IO.EnumerationOptions>
+;  V04 tmp3         [V04,T05] (  3,  2   )     ref  ->  rbx         class-hnd exact "Inline return value spill temp" <System.IO.FileInfo[]>
+;  V05 tmp4         [V05,T04] (  5,  2.50)     ref  ->  rbx         class-hnd "Inline stloc first use temp" <System.IO.FileInfo[]>
+;* V06 tmp5         [V06    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "NewArr temp" <System.IO.FileInfo[]>
+;  V07 tmp6         [V07    ] (  4,  3   )     ref  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed "field V02._array (fldOffset=0x0)" P-DEP
+;  V08 tmp7         [V08    ] (  6,  4.50)     int  ->  [rbp-0x10]  do-not-enreg[X] addr-exposed "field V02._count (fldOffset=0x8)" P-DEP
+;  V09 tmp8         [V09,T02] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
+;  V10 tmp9         [V10,T03] (  2,  4   )     ref  ->  rdx         single-def "argument with side effect"
 ;
-; Lcl frame size = 8
+; Lcl frame size = 24
 
 G_M35469_IG01:
        push     rbp
-       push     r15
-       push     r14
        push     rbx
-       push     rax
+       sub      rsp, 24
        lea      rbp, [rsp+0x20]
+       xor      eax, eax
+       mov      qword ptr [rbp-0x18], rax
        mov      rbx, rdi
-						;; size=15 bbWeight=1 PerfScore 5.75
+						;; size=20 bbWeight=1 PerfScore 4.25
 G_M35469_IG02:
        mov      rdi, 0xD1FFAB1E      ; global ptr
        test     byte  ptr [rdi], 1
-       je       G_M35469_IG05
+       je       G_M35469_IG10
 						;; size=19 bbWeight=1 PerfScore 4.25
 G_M35469_IG03:
-       mov      rdi, 0xD1FFAB1E      ; data for System.IO.EnumerationOptions:<Compatible>k__BackingField
-       mov      r15, gword ptr [rdi]
-       mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.List`1[System.IO.FileInfo]
-       call     CORINFO_HELP_NEWSFAST
-       mov      r14, rax
+       mov      rsi, 0xD1FFAB1E      ; data for System.IO.EnumerationOptions:<Compatible>k__BackingField
+       mov      r8, gword ptr [rsi]
+       vxorps   xmm0, xmm0, xmm0
+       vmovdqu  xmmword ptr [rbp-0x18], xmm0
        mov      rsi, gword ptr [rbx+0x08]
        mov      rdi, rbx
-       mov      r8, r15
        mov      rdx, 0xD1FFAB1E      ; '*'
        mov      ecx, 1
        mov      rax, 0xD1FFAB1E      ; code for System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
        call     [rax]System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
        mov      rsi, rax
        mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.IEnumerable`1[System.IO.FileInfo]
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_CHKCASTANY
        call     [rax]CORINFO_HELP_CHKCASTANY
-       mov      rsi, rax
-       mov      rdi, r14
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       call     [rax]System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       mov      rdi, r14
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=124 bbWeight=1 PerfScore 18.00
+       mov      rdx, rax
+       lea      rdi, [rbp-0x18]
+       mov      rsi, 0xD1FFAB1E      ; System.Collections.Generic.ArrayBuilder`1[System.IO.FileInfo]
+       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       call     [rax]System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       cmp      dword ptr [rbp-0x10], 0
+       je       SHORT G_M35469_IG06
+						;; size=116 bbWeight=1 PerfScore 20.58
 G_M35469_IG04:
-       add      rsp, 8
-       pop      rbx
-       pop      r14
-       pop      r15
-       pop      rbp
-       tail.jmp [rax]System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=13 bbWeight=1 PerfScore 6.25
+       mov      rbx, gword ptr [rbp-0x18]
+       mov      esi, dword ptr [rbp-0x10]
+       cmp      esi, dword ptr [rbx+0x08]
+       jge      SHORT G_M35469_IG05
+       movsxd   rsi, dword ptr [rbp-0x10]
+       mov      rdi, 0xD1FFAB1E      ; System.IO.FileInfo[]
+       call     CORINFO_HELP_NEWARR_1_PTR
+       mov      rbx, rax
+       mov      rdi, gword ptr [rbp-0x18]
+       mov      rsi, rbx
+       mov      edx, dword ptr [rbp-0x10]
+       mov      rax, 0xD1FFAB1E      ; code for System.Array:Copy(System.Array,System.Array,int)
+       call     [rax]System.Array:Copy(System.Array,System.Array,int)
+						;; size=56 bbWeight=0.50 PerfScore 8.00
 G_M35469_IG05:
+       jmp      SHORT G_M35469_IG08
+						;; size=2 bbWeight=0.50 PerfScore 1.00
+G_M35469_IG06:
+       mov      rdi, 0xD1FFAB1E      ; global ptr
+       test     byte  ptr [rdi], 1
+       je       SHORT G_M35469_IG11
+						;; size=15 bbWeight=0.50 PerfScore 2.12
+G_M35469_IG07:
+       mov      rax, 0xD1FFAB1E      ; data for System.Array+EmptyArray`1[System.IO.FileInfo]:Value
+       mov      rbx, gword ptr [rax]
+						;; size=13 bbWeight=0.50 PerfScore 1.12
+G_M35469_IG08:
+       mov      rax, rbx
+						;; size=3 bbWeight=1 PerfScore 0.25
+G_M35469_IG09:
+       add      rsp, 24
+       pop      rbx
+       pop      rbp
+       ret      
+						;; size=7 bbWeight=1 PerfScore 2.25
+G_M35469_IG10:
        mov      rdi, 0xD1FFAB1E      ; System.IO.EnumerationOptions
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_GET_GCSTATIC_BASE
        call     [rax]CORINFO_HELP_GET_GCSTATIC_BASE
        jmp      G_M35469_IG03
 						;; size=27 bbWeight=0 PerfScore 0.00
+G_M35469_IG11:
+       mov      rdi, 0xD1FFAB1E      ; System.Array+EmptyArray`1[System.IO.FileInfo]
+       mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_GET_GCSTATIC_BASE
+       call     [rax]CORINFO_HELP_GET_GCSTATIC_BASE
+       jmp      SHORT G_M35469_IG07
+						;; size=24 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 198, prolog size 12, PerfScore 34.25, instruction count 42, allocated bytes for code 198 (MethodHash=8bdd7572) for method System.IO.DirectoryInfo:GetFiles():System.IO.FileInfo[]:this (FullOpts)
+; Total bytes of code 302, prolog size 17, PerfScore 43.83, instruction count 63, allocated bytes for code 302 (MethodHash=8bdd7572) for method System.IO.DirectoryInfo:GetFiles():System.IO.FileInfo[]:this (FullOpts)
 ; ============================================================

102 (74.45 % of base) - System.IO.DirectoryInfo:GetDirectories(System.String,System.IO.EnumerationOptions):System.IO.DirectoryInfo[]:this

 ; Assembly listing for method System.IO.DirectoryInfo:GetDirectories(System.String,System.IO.EnumerationOptions):System.IO.DirectoryInfo[]:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
+; 0 inlinees with PGO data; 1 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T00] (  4,  4   )     ref  ->  rbx         this class-hnd single-def <System.IO.DirectoryInfo>
-;  V01 arg1         [V01,T02] (  3,  3   )     ref  ->  r15         class-hnd single-def <System.String>
-;  V02 arg2         [V02,T03] (  3,  3   )     ref  ->  r14         class-hnd single-def <System.IO.EnumerationOptions>
-;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
-;  V04 tmp1         [V04,T01] (  3,  6   )     ref  ->  r13         class-hnd exact single-def "NewObj constructor temp" <System.Collections.Generic.List`1[System.IO.DirectoryInfo]>
-;  V05 tmp2         [V05,T04] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
-;  V06 tmp3         [V06,T05] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
+;  V00 this         [V00,T00] (  4,  4   )     ref  ->  rdi         this class-hnd single-def <System.IO.DirectoryInfo>
+;  V01 arg1         [V01,T01] (  3,  3   )     ref  ->   r8         class-hnd single-def <System.String>
+;  V02 arg2         [V02,T02] (  3,  3   )     ref  ->  rcx         class-hnd single-def <System.IO.EnumerationOptions>
+;  V03 loc0         [V03    ] (  8,  5.50)  struct (16) [rbp-0x18]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.ArrayBuilder`1[System.IO.DirectoryInfo]>
+;# V04 OutArgs      [V04    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
+;  V05 tmp1         [V05,T06] (  3,  2   )     ref  ->  rbx         class-hnd exact "Inline return value spill temp" <System.IO.DirectoryInfo[]>
+;  V06 tmp2         [V06,T05] (  5,  2.50)     ref  ->  rbx         class-hnd "Inline stloc first use temp" <System.IO.DirectoryInfo[]>
+;* V07 tmp3         [V07    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "NewArr temp" <System.IO.DirectoryInfo[]>
+;  V08 tmp4         [V08    ] (  4,  3   )     ref  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed "field V03._array (fldOffset=0x0)" P-DEP
+;  V09 tmp5         [V09    ] (  6,  4.50)     int  ->  [rbp-0x10]  do-not-enreg[X] addr-exposed "field V03._count (fldOffset=0x8)" P-DEP
+;  V10 tmp6         [V10,T03] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
+;  V11 tmp7         [V11,T04] (  2,  4   )     ref  ->  rdx         single-def "argument with side effect"
 ;
-; Lcl frame size = 0
+; Lcl frame size = 24
 
 G_M13984_IG01:
        push     rbp
-       push     r15
-       push     r14
-       push     r13
        push     rbx
+       sub      rsp, 24
        lea      rbp, [rsp+0x20]
-       mov      rbx, rdi
-       mov      r15, rsi
-       mov      r14, rdx
-						;; size=22 bbWeight=1 PerfScore 6.25
+       xor      eax, eax
+       mov      qword ptr [rbp-0x18], rax
+       mov      r8, rsi
+       mov      rcx, rdx
+						;; size=23 bbWeight=1 PerfScore 4.50
 G_M13984_IG02:
-       mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.List`1[System.IO.DirectoryInfo]
-       call     CORINFO_HELP_NEWSFAST
-       mov      r13, rax
-       mov      rsi, gword ptr [rbx+0x08]
-       mov      rdi, rbx
-       mov      rdx, r15
-       mov      r8, r14
+       vxorps   xmm0, xmm0, xmm0
+       vmovdqu  xmmword ptr [rbp-0x18], xmm0
+       mov      rsi, gword ptr [rdi+0x08]
+       mov      rdx, r8
+       mov      r8, rcx
        mov      ecx, 2
        mov      rax, 0xD1FFAB1E      ; code for System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
        call     [rax]System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
        mov      rsi, rax
        mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.IEnumerable`1[System.IO.DirectoryInfo]
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_CHKCASTANY
        call     [rax]CORINFO_HELP_CHKCASTANY
-       mov      rsi, rax
-       mov      rdi, r13
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       call     [rax]System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       mov      rdi, r13
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=104 bbWeight=1 PerfScore 15.75
+       mov      rdx, rax
+       lea      rdi, [rbp-0x18]
+       mov      rsi, 0xD1FFAB1E      ; System.Collections.Generic.ArrayBuilder`1[System.IO.DirectoryInfo]
+       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       call     [rax]System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       cmp      dword ptr [rbp-0x10], 0
+       je       SHORT G_M13984_IG05
+						;; size=96 bbWeight=1 PerfScore 18.33
 G_M13984_IG03:
+       mov      rbx, gword ptr [rbp-0x18]
+       mov      esi, dword ptr [rbp-0x10]
+       cmp      esi, dword ptr [rbx+0x08]
+       jge      SHORT G_M13984_IG04
+       movsxd   rsi, dword ptr [rbp-0x10]
+       mov      rdi, 0xD1FFAB1E      ; System.IO.DirectoryInfo[]
+       call     CORINFO_HELP_NEWARR_1_PTR
+       mov      rbx, rax
+       mov      rdi, gword ptr [rbp-0x18]
+       mov      rsi, rbx
+       mov      edx, dword ptr [rbp-0x10]
+       mov      rax, 0xD1FFAB1E      ; code for System.Array:Copy(System.Array,System.Array,int)
+       call     [rax]System.Array:Copy(System.Array,System.Array,int)
+						;; size=56 bbWeight=0.50 PerfScore 8.00
+G_M13984_IG04:
+       jmp      SHORT G_M13984_IG07
+						;; size=2 bbWeight=0.50 PerfScore 1.00
+G_M13984_IG05:
+       mov      rdi, 0xD1FFAB1E      ; global ptr
+       test     byte  ptr [rdi], 1
+       je       SHORT G_M13984_IG09
+						;; size=15 bbWeight=0.50 PerfScore 2.12
+G_M13984_IG06:
+       mov      rax, 0xD1FFAB1E      ; data for System.Array+EmptyArray`1[System.IO.DirectoryInfo]:Value
+       mov      rbx, gword ptr [rax]
+						;; size=13 bbWeight=0.50 PerfScore 1.12
+G_M13984_IG07:
+       mov      rax, rbx
+						;; size=3 bbWeight=1 PerfScore 0.25
+G_M13984_IG08:
+       add      rsp, 24
        pop      rbx
-       pop      r13
-       pop      r14
-       pop      r15
        pop      rbp
-       tail.jmp [rax]System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=11 bbWeight=1 PerfScore 6.50
+       ret      
+						;; size=7 bbWeight=1 PerfScore 2.25
+G_M13984_IG09:
+       mov      rdi, 0xD1FFAB1E      ; System.Array+EmptyArray`1[System.IO.DirectoryInfo]
+       mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_GET_GCSTATIC_BASE
+       call     [rax]CORINFO_HELP_GET_GCSTATIC_BASE
+       jmp      SHORT G_M13984_IG06
+						;; size=24 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 137, prolog size 13, PerfScore 28.50, instruction count 35, allocated bytes for code 137 (MethodHash=2d28c95f) for method System.IO.DirectoryInfo:GetDirectories(System.String,System.IO.EnumerationOptions):System.IO.DirectoryInfo[]:this (FullOpts)
+; Total bytes of code 239, prolog size 17, PerfScore 37.58, instruction count 55, allocated bytes for code 239 (MethodHash=2d28c95f) for method System.IO.DirectoryInfo:GetDirectories(System.String,System.IO.EnumerationOptions):System.IO.DirectoryInfo[]:this (FullOpts)
 ; ============================================================

102 (74.45 % of base) - System.IO.DirectoryInfo:GetFiles(System.String,System.IO.EnumerationOptions):System.IO.FileInfo[]:this

 ; Assembly listing for method System.IO.DirectoryInfo:GetFiles(System.String,System.IO.EnumerationOptions):System.IO.FileInfo[]:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
+; 0 inlinees with PGO data; 1 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T00] (  4,  4   )     ref  ->  rbx         this class-hnd single-def <System.IO.DirectoryInfo>
-;  V01 arg1         [V01,T02] (  3,  3   )     ref  ->  r15         class-hnd single-def <System.String>
-;  V02 arg2         [V02,T03] (  3,  3   )     ref  ->  r14         class-hnd single-def <System.IO.EnumerationOptions>
-;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
-;  V04 tmp1         [V04,T01] (  3,  6   )     ref  ->  r13         class-hnd exact single-def "NewObj constructor temp" <System.Collections.Generic.List`1[System.IO.FileInfo]>
-;  V05 tmp2         [V05,T04] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
-;  V06 tmp3         [V06,T05] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
+;  V00 this         [V00,T00] (  4,  4   )     ref  ->  rdi         this class-hnd single-def <System.IO.DirectoryInfo>
+;  V01 arg1         [V01,T01] (  3,  3   )     ref  ->   r8         class-hnd single-def <System.String>
+;  V02 arg2         [V02,T02] (  3,  3   )     ref  ->  rcx         class-hnd single-def <System.IO.EnumerationOptions>
+;  V03 loc0         [V03    ] (  8,  5.50)  struct (16) [rbp-0x18]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.ArrayBuilder`1[System.IO.FileInfo]>
+;# V04 OutArgs      [V04    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
+;  V05 tmp1         [V05,T06] (  3,  2   )     ref  ->  rbx         class-hnd exact "Inline return value spill temp" <System.IO.FileInfo[]>
+;  V06 tmp2         [V06,T05] (  5,  2.50)     ref  ->  rbx         class-hnd "Inline stloc first use temp" <System.IO.FileInfo[]>
+;* V07 tmp3         [V07    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "NewArr temp" <System.IO.FileInfo[]>
+;  V08 tmp4         [V08    ] (  4,  3   )     ref  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed "field V03._array (fldOffset=0x0)" P-DEP
+;  V09 tmp5         [V09    ] (  6,  4.50)     int  ->  [rbp-0x10]  do-not-enreg[X] addr-exposed "field V03._count (fldOffset=0x8)" P-DEP
+;  V10 tmp6         [V10,T03] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
+;  V11 tmp7         [V11,T04] (  2,  4   )     ref  ->  rdx         single-def "argument with side effect"
 ;
-; Lcl frame size = 0
+; Lcl frame size = 24
 
 G_M17685_IG01:
        push     rbp
-       push     r15
-       push     r14
-       push     r13
        push     rbx
+       sub      rsp, 24
        lea      rbp, [rsp+0x20]
-       mov      rbx, rdi
-       mov      r15, rsi
-       mov      r14, rdx
-						;; size=22 bbWeight=1 PerfScore 6.25
+       xor      eax, eax
+       mov      qword ptr [rbp-0x18], rax
+       mov      r8, rsi
+       mov      rcx, rdx
+						;; size=23 bbWeight=1 PerfScore 4.50
 G_M17685_IG02:
-       mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.List`1[System.IO.FileInfo]
-       call     CORINFO_HELP_NEWSFAST
-       mov      r13, rax
-       mov      rsi, gword ptr [rbx+0x08]
-       mov      rdi, rbx
-       mov      rdx, r15
-       mov      r8, r14
+       vxorps   xmm0, xmm0, xmm0
+       vmovdqu  xmmword ptr [rbp-0x18], xmm0
+       mov      rsi, gword ptr [rdi+0x08]
+       mov      rdx, r8
+       mov      r8, rcx
        mov      ecx, 1
        mov      rax, 0xD1FFAB1E      ; code for System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
        call     [rax]System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
        mov      rsi, rax
        mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.IEnumerable`1[System.IO.FileInfo]
        mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_CHKCASTANY
        call     [rax]CORINFO_HELP_CHKCASTANY
-       mov      rsi, rax
-       mov      rdi, r13
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       call     [rax]System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       mov      rdi, r13
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=104 bbWeight=1 PerfScore 15.75
+       mov      rdx, rax
+       lea      rdi, [rbp-0x18]
+       mov      rsi, 0xD1FFAB1E      ; System.Collections.Generic.ArrayBuilder`1[System.IO.FileInfo]
+       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       call     [rax]System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       cmp      dword ptr [rbp-0x10], 0
+       je       SHORT G_M17685_IG05
+						;; size=96 bbWeight=1 PerfScore 18.33
 G_M17685_IG03:
+       mov      rbx, gword ptr [rbp-0x18]
+       mov      esi, dword ptr [rbp-0x10]
+       cmp      esi, dword ptr [rbx+0x08]
+       jge      SHORT G_M17685_IG04
+       movsxd   rsi, dword ptr [rbp-0x10]
+       mov      rdi, 0xD1FFAB1E      ; System.IO.FileInfo[]
+       call     CORINFO_HELP_NEWARR_1_PTR
+       mov      rbx, rax
+       mov      rdi, gword ptr [rbp-0x18]
+       mov      rsi, rbx
+       mov      edx, dword ptr [rbp-0x10]
+       mov      rax, 0xD1FFAB1E      ; code for System.Array:Copy(System.Array,System.Array,int)
+       call     [rax]System.Array:Copy(System.Array,System.Array,int)
+						;; size=56 bbWeight=0.50 PerfScore 8.00
+G_M17685_IG04:
+       jmp      SHORT G_M17685_IG07
+						;; size=2 bbWeight=0.50 PerfScore 1.00
+G_M17685_IG05:
+       mov      rdi, 0xD1FFAB1E      ; global ptr
+       test     byte  ptr [rdi], 1
+       je       SHORT G_M17685_IG09
+						;; size=15 bbWeight=0.50 PerfScore 2.12
+G_M17685_IG06:
+       mov      rax, 0xD1FFAB1E      ; data for System.Array+EmptyArray`1[System.IO.FileInfo]:Value
+       mov      rbx, gword ptr [rax]
+						;; size=13 bbWeight=0.50 PerfScore 1.12
+G_M17685_IG07:
+       mov      rax, rbx
+						;; size=3 bbWeight=1 PerfScore 0.25
+G_M17685_IG08:
+       add      rsp, 24
        pop      rbx
-       pop      r13
-       pop      r14
-       pop      r15
        pop      rbp
-       tail.jmp [rax]System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=11 bbWeight=1 PerfScore 6.50
+       ret      
+						;; size=7 bbWeight=1 PerfScore 2.25
+G_M17685_IG09:
+       mov      rdi, 0xD1FFAB1E      ; System.Array+EmptyArray`1[System.IO.FileInfo]
+       mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_GET_GCSTATIC_BASE
+       call     [rax]CORINFO_HELP_GET_GCSTATIC_BASE
+       jmp      SHORT G_M17685_IG06
+						;; size=24 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 137, prolog size 13, PerfScore 28.50, instruction count 35, allocated bytes for code 137 (MethodHash=4accbaea) for method System.IO.DirectoryInfo:GetFiles(System.String,System.IO.EnumerationOptions):System.IO.FileInfo[]:this (FullOpts)
+; Total bytes of code 239, prolog size 17, PerfScore 37.58, instruction count 55, allocated bytes for code 239 (MethodHash=4accbaea) for method System.IO.DirectoryInfo:GetFiles(System.String,System.IO.EnumerationOptions):System.IO.FileInfo[]:this (FullOpts)
 ; ============================================================

102 (91.07 % of base) - System.IO.DirectoryInfo:GetFileSystemInfos(System.String,System.IO.EnumerationOptions):System.IO.FileSystemInfo[]:this

 ; Assembly listing for method System.IO.DirectoryInfo:GetFileSystemInfos(System.String,System.IO.EnumerationOptions):System.IO.FileSystemInfo[]:this (FullOpts)
 ; Emitting BLENDED_CODE for generic X64 + VEX + EVEX on Unix
 ; FullOpts code
 ; optimized code
 ; rbp based frame
 ; partially interruptible
 ; No PGO data
+; 0 inlinees with PGO data; 1 single block inlinees; 1 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 this         [V00,T00] (  4,  4   )     ref  ->  rbx         this class-hnd single-def <System.IO.DirectoryInfo>
-;  V01 arg1         [V01,T02] (  3,  3   )     ref  ->  r15         class-hnd single-def <System.String>
-;  V02 arg2         [V02,T03] (  3,  3   )     ref  ->  r14         class-hnd single-def <System.IO.EnumerationOptions>
-;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
-;  V04 tmp1         [V04,T01] (  3,  6   )     ref  ->  r13         class-hnd exact single-def "NewObj constructor temp" <System.Collections.Generic.List`1[System.IO.FileSystemInfo]>
-;  V05 tmp2         [V05,T04] (  2,  4   )     ref  ->  rsi         single-def "argument with side effect"
+;  V00 this         [V00,T00] (  4,  4   )     ref  ->  rdi         this class-hnd single-def <System.IO.DirectoryInfo>
+;  V01 arg1         [V01,T01] (  3,  3   )     ref  ->   r8         class-hnd single-def <System.String>
+;  V02 arg2         [V02,T02] (  3,  3   )     ref  ->  rcx         class-hnd single-def <System.IO.EnumerationOptions>
+;  V03 loc0         [V03    ] (  8,  5.50)  struct (16) [rbp-0x18]  do-not-enreg[XS] must-init addr-exposed ld-addr-op <System.Collections.Generic.ArrayBuilder`1[System.IO.FileSystemInfo]>
+;# V04 OutArgs      [V04    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <Empty>
+;  V05 tmp1         [V05,T05] (  3,  2   )     ref  ->  rbx         class-hnd "Inline return value spill temp" <System.IO.FileSystemInfo[]>
+;  V06 tmp2         [V06,T04] (  5,  2.50)     ref  ->  rbx         class-hnd "Inline stloc first use temp" <System.IO.FileSystemInfo[]>
+;* V07 tmp3         [V07    ] (  0,  0   )     ref  ->  zero-ref    class-hnd exact "NewArr temp" <System.IO.FileSystemInfo[]>
+;  V08 tmp4         [V08    ] (  4,  3   )     ref  ->  [rbp-0x18]  do-not-enreg[X] addr-exposed "field V03._array (fldOffset=0x0)" P-DEP
+;  V09 tmp5         [V09    ] (  6,  4.50)     int  ->  [rbp-0x10]  do-not-enreg[X] addr-exposed "field V03._count (fldOffset=0x8)" P-DEP
+;  V10 tmp6         [V10,T03] (  2,  4   )     ref  ->  rdx         single-def "argument with side effect"
 ;
-; Lcl frame size = 0
+; Lcl frame size = 24
 
 G_M55451_IG01:
        push     rbp
-       push     r15
-       push     r14
-       push     r13
        push     rbx
+       sub      rsp, 24
        lea      rbp, [rsp+0x20]
-       mov      rbx, rdi
-       mov      r15, rsi
-       mov      r14, rdx
-						;; size=22 bbWeight=1 PerfScore 6.25
+       xor      eax, eax
+       mov      qword ptr [rbp-0x18], rax
+       mov      r8, rsi
+       mov      rcx, rdx
+						;; size=23 bbWeight=1 PerfScore 4.50
 G_M55451_IG02:
-       mov      rdi, 0xD1FFAB1E      ; System.Collections.Generic.List`1[System.IO.FileSystemInfo]
-       call     CORINFO_HELP_NEWSFAST
-       mov      r13, rax
-       mov      rsi, gword ptr [rbx+0x08]
-       mov      rdi, rbx
-       mov      rdx, r15
-       mov      r8, r14
+       vxorps   xmm0, xmm0, xmm0
+       vmovdqu  xmmword ptr [rbp-0x18], xmm0
+       mov      rsi, gword ptr [rdi+0x08]
+       mov      rdx, r8
+       mov      r8, rcx
        mov      ecx, 3
        mov      rax, 0xD1FFAB1E      ; code for System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
        call     [rax]System.IO.DirectoryInfo:InternalEnumerateInfos(System.String,System.String,int,System.IO.EnumerationOptions):System.Collections.Generic.IEnumerable`1[System.IO.FileSystemInfo]:this
-       mov      rsi, rax
-       mov      rdi, r13
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       call     [rax]System.Collections.Generic.List`1[System.__Canon]:.ctor(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
-       mov      rdi, r13
-       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=79 bbWeight=1 PerfScore 12.00
+       mov      rdx, rax
+       lea      rdi, [rbp-0x18]
+       mov      rsi, 0xD1FFAB1E      ; System.Collections.Generic.ArrayBuilder`1[System.IO.FileSystemInfo]
+       mov      rax, 0xD1FFAB1E      ; code for System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       call     [rax]System.Collections.Generic.ArrayBuilder`1[System.__Canon]:AddRange(System.Collections.Generic.IEnumerable`1[System.__Canon]):this
+       cmp      dword ptr [rbp-0x10], 0
+       je       SHORT G_M55451_IG05
+						;; size=71 bbWeight=1 PerfScore 14.58
 G_M55451_IG03:
+       mov      rbx, gword ptr [rbp-0x18]
+       mov      esi, dword ptr [rbp-0x10]
+       cmp      esi, dword ptr [rbx+0x08]
+       jge      SHORT G_M55451_IG04
+       movsxd   rsi, dword ptr [rbp-0x10]
+       mov      rdi, 0xD1FFAB1E      ; System.IO.FileSystemInfo[]
+       call     CORINFO_HELP_NEWARR_1_PTR
+       mov      rbx, rax
+       mov      rdi, gword ptr [rbp-0x18]
+       mov      rsi, rbx
+       mov      edx, dword ptr [rbp-0x10]
+       mov      rax, 0xD1FFAB1E      ; code for System.Array:Copy(System.Array,System.Array,int)
+       call     [rax]System.Array:Copy(System.Array,System.Array,int)
+						;; size=56 bbWeight=0.50 PerfScore 8.00
+G_M55451_IG04:
+       jmp      SHORT G_M55451_IG07
+						;; size=2 bbWeight=0.50 PerfScore 1.00
+G_M55451_IG05:
+       mov      rdi, 0xD1FFAB1E      ; global ptr
+       test     byte  ptr [rdi], 1
+       je       SHORT G_M55451_IG09
+						;; size=15 bbWeight=0.50 PerfScore 2.12
+G_M55451_IG06:
+       mov      rax, 0xD1FFAB1E      ; data for System.Array+EmptyArray`1[System.IO.FileSystemInfo]:Value
+       mov      rbx, gword ptr [rax]
+						;; size=13 bbWeight=0.50 PerfScore 1.12
+G_M55451_IG07:
+       mov      rax, rbx
+						;; size=3 bbWeight=1 PerfScore 0.25
+G_M55451_IG08:
+       add      rsp, 24
        pop      rbx
-       pop      r13
-       pop      r14
-       pop      r15
        pop      rbp
-       tail.jmp [rax]System.Collections.Generic.List`1[System.__Canon]:ToArray():System.__Canon[]:this
-						;; size=11 bbWeight=1 PerfScore 6.50
+       ret      
+						;; size=7 bbWeight=1 PerfScore 2.25
+G_M55451_IG09:
+       mov      rdi, 0xD1FFAB1E      ; System.Array+EmptyArray`1[System.IO.FileSystemInfo]
+       mov      rax, 0xD1FFAB1E      ; code for CORINFO_HELP_GET_GCSTATIC_BASE
+       call     [rax]CORINFO_HELP_GET_GCSTATIC_BASE
+       jmp      SHORT G_M55451_IG06
+						;; size=24 bbWeight=0 PerfScore 0.00
 
-; Total bytes of code 112, prolog size 13, PerfScore 24.75, instruction count 31, allocated bytes for code 112 (MethodHash=be8b2764) for method System.IO.DirectoryInfo:GetFileSystemInfos(System.String,System.IO.EnumerationOptions):System.IO.FileSystemInfo[]:this (FullOpts)
+; Total bytes of code 214, prolog size 17, PerfScore 33.83, instruction count 51, allocated bytes for code 214 (MethodHash=be8b2764) for method System.IO.DirectoryInfo:GetFileSystemInfos(System.String,System.IO.EnumerationOptions):System.IO.FileSystemInfo[]:this (FullOpts)
 ; ============================================================

Note: some changes were skipped as they were too large to fit into a comment.

Larger list of diffs: https://gist.github.com/MihuBot/bcf7e80598057f4d819585abe6ddcd54

[MihuBot]

@MihaZupan