Add BCR to linear Scan RA

Change-Id: I030045cff167055fd757905161c9034890c08df3

Author: bcheng0127

visa/FlowGraph.h

@@ -1265,6 +1265,7 @@ class FlowGraph
   DO(GRAPH_COLORING_SPILL_RR_RA)                                               \
   DO(GRAPH_COLORING_SPILL_FF_RA)                                               \
   DO(GLOBAL_LINEAR_SCAN_RA)                                                    \
+  DO(GLOBAL_LINEAR_SCAN_BC_RA)                                                 \
   DO(UNKNOWN_RA)
 
 enum RA_Type

visa/LinearScanRA.cpp

@@ -1607,14 +1607,26 @@ bool LinearScanRA::doLinearScanRA()
         reduceBCInRR = bc.setupBankConflictsForKernel(false, reduceBCInTAandFF, numRegLRA, highInternalConflict);
     }
 
+    if (reduceBCInTAandFF || reduceBCInRR)
+    {
+        doBCR = true;
+    }
+
     //Initial pregs which will be used in the preRAAnalysis
     PhyRegsLocalRA phyRegs(&builder, kernel.getNumRegTotal());
     pregs = &phyRegs;
     preRAAnalysis();
 
     bool success = linearScanRA();
 
-    kernel.setRAType(RA_Type::GLOBAL_LINEAR_SCAN_RA);
+    if (doBCR)
+    {
+        kernel.setRAType(RA_Type::GLOBAL_LINEAR_SCAN_BC_RA);
+    }
+    else
+    {
+        kernel.setRAType(RA_Type::GLOBAL_LINEAR_SCAN_RA);
+    }
     //kernel.dump();
     return success;
 }

visa/RegAlloc.cpp

@@ -3761,6 +3761,7 @@ static void recordRAStats(IR_Builder& builder,
         case RA_Type::GRAPH_COLORING_SPILL_RR_BC_RA:
         case RA_Type::GRAPH_COLORING_SPILL_FF_BC_RA:
         case RA_Type::GLOBAL_LINEAR_SCAN_RA:
+        case RA_Type::GLOBAL_LINEAR_SCAN_BC_RA:
             Stats.SetFlag("IsGlobalRA", SimdSize);
             break;
         case RA_Type::UNKNOWN_RA: