Skip simd32 compilation for per-pixel dispatch with x16 samples.

Change-Id: I5f94ba2ab8703ceb3d31dac7813cc43cd41101a9

Author: mmerecki

IGC/Compiler/CISACodeGen/PixelShaderCodeGen.cpp

@@ -1270,6 +1270,15 @@ bool CPixelShader::CompileSIMDSize(SIMDMode simdMode, EmitPass& EP, llvm::Functi
 
         const PixelShaderInfo& psInfo = ctx->getModuleMetaData()->psInfo;
 
+        // Disable simd32 compilation on platforms that do not support per-pixel
+        // dispatch with num samples == 16.
+        if (psInfo.NumSamples == 16 &&
+            !ctx->platform.supportSimd32PerPixelPSWithNumSamples16() &&
+            !IsPerSample())
+        {
+            return false;
+        }
+
         if (psInfo.ForceEnableSimd32) // UMD forced compilation of simd32.
         {
             return true;

IGC/Compiler/CISACodeGen/Platform.hpp

@@ -113,6 +113,12 @@ bool SupportHDCUnormFormats() const { return m_platformInfo.eRenderCoreFamily >=
     }
 bool psSimd32SkipStallHeuristic() const { return m_caps.KernelHwCaps.EUThreadsPerEU == 6; }
 bool enablePSsimd32() const { return m_platformInfo.eRenderCoreFamily >= IGFX_GEN9_CORE; }
+
+bool supportSimd32PerPixelPSWithNumSamples16() const
+{
+    return false;
+}
+
 bool supportDisableMidThreadPreemptionSwitch() const { return m_platformInfo.eRenderCoreFamily >= IGFX_GEN10_CORE; }
 
 bool needSWStencil() const

IGC/common/MDFrameWork.h

@@ -248,6 +248,10 @@ namespace IGC
         bool blendToFillEnabled              = false;
         bool forceEarlyZ                     = false;   // force earlyz test
         bool hasVersionedLoop                = false;   // if versioned by customloopversioning
+        // Number of samples for this pixel shader if known.
+        // Valid values 0, 1, 2, 4, 8 and 16.
+        // 0 means unknown or not set.
+        unsigned char NumSamples             = 0;
         std::vector<int> blendOptimizationMode;
         std::vector<int> colorOutputMask;
     };