Optimize vector oword block load

Use vector copy instead of oword block load on specific device.
intel · Aug 30, 2024 · a7ed19e · a7ed19e
1 parent dbad589
commit a7ed19e
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Showing 2 changed files with 17 additions and 1 deletion.
diff --git a/IGC/Compiler/CISACodeGen/EmitVISAPass.cpp b/IGC/Compiler/CISACodeGen/EmitVISAPass.cpp
@@ -17762,7 +17762,6 @@ void EmitPass::emitVectorLoad(LoadInst* inst, Value* offset, ConstantInt* immOff
  return;
  }
 
-
  bool bEmulateDWAligned = false;
 
  // generate oword-load if possible
@@ -17783,6 +17782,17 @@ void EmitPass::emitVectorLoad(LoadInst* inst, Value* offset, ConstantInt* immOff
  bool needTemp = (!destUniform || !IsGRFAligned(m_destination, EALIGN_GRF));
  CVariable * loadDest = m_destination;
 
+ // (needTemp = false) means GRF aligned as (destUniform = true)
+ if (!useDWAligned && useOWAligned && !needTemp &&
+ srcUniform && destUniform &&
+ destType == VISA_Type::ISA_TYPE_F &&
+ eOffset->GetType() == VISA_Type::ISA_TYPE_UD &&
+ m_currShader->m_Platform->allowFastestSIMDVectorLoad4Perf())
+ {
+ emitVectorCopy(loadDest, eOffset, elts);
+ return;
+ }
+
  if (useOWAligned)
  {
  // Offset needs to be in OW!

diff --git a/IGC/Compiler/CISACodeGen/Platform.hpp b/IGC/Compiler/CISACodeGen/Platform.hpp
@@ -1787,5 +1787,11 @@ bool allowDivergentControlFlowRayQueryCheckRelease() const
  return m_WaTable.Wa_22019804511 != 0;
 }
 
+bool allowFastestSIMDVectorLoad4Perf() const
+{
+ return m_platformInfo.eProductFamily == IGFX_ALDERLAKE_P &&
+ m_platformInfo.usDeviceID == 0x4626;
+}
+
 };
 }//namespace IGC