[Autobackout][FuncReg]Revert of change: 2cb98c2

Remove redundant movs for waveShuffle

Change-Id: Ia43c3862c5326d6cb16e03343e2d88f3217040bb

Author: fftzeng

IGC/Compiler/CustomSafeOptPass.cpp

@@ -446,11 +446,6 @@ void CustomSafeOptPass::visitCallInst(CallInst& C)
             break;
         }
 
-        case GenISAIntrinsic::GenISA_WaveShuffleIndex:
-        {
-            visitWaveShuffleIndex(inst);
-            break;
-        }
         default:
             break;
         }
@@ -1178,15 +1173,6 @@ void IGC::CustomSafeOptPass::visitLdptr(llvm::CallInst* inst)
     }
 }
 
-void IGC::CustomSafeOptPass::visitWaveShuffleIndex(llvm::CallInst* inst)
-{
-    llvm::Constant* src1 = llvm::dyn_cast<llvm::Constant>(inst->getOperand(1));
-    llvm::Constant* src2 = llvm::dyn_cast<llvm::Constant>(inst->getOperand(2));
-    if (src1 && src2 && src1->isZeroValue() && src2->isZeroValue())
-    {
-        inst->replaceAllUsesWith(inst->getOperand(0));
-    }
-}
 
 void IGC::CustomSafeOptPass::visitLdRawVec(llvm::CallInst* inst)
 {

IGC/Compiler/CustomSafeOptPass.hpp

@@ -82,7 +82,6 @@ namespace IGC
         void visitLdptr(llvm::CallInst* inst);
         void visitLdRawVec(llvm::CallInst* inst);
         void visitLoadInst(llvm::LoadInst& I);
-        void visitWaveShuffleIndex(llvm::CallInst* inst);
 
         //
         // IEEE Floating point arithmetic is not associative.  Any pattern