InstCombine: Set operands instead of creating new call

llvm-svn: 291612

Author: arsenm

llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp

@@ -1599,21 +1599,17 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
     // fma fneg(x), fneg(y), z -> fma x, y, z
     if (match(Src0, m_FNeg(m_Value(LHS))) &&
         match(Src1, m_FNeg(m_Value(RHS)))) {
-      CallInst *NewCall = Builder->CreateCall(II->getCalledFunction(),
-                                              {LHS, RHS, II->getArgOperand(2)});
-      NewCall->takeName(II);
-      NewCall->copyFastMathFlags(II);
-      return replaceInstUsesWith(*II, NewCall);
+      II->setArgOperand(0, LHS);
+      II->setArgOperand(1, RHS);
+      return II;
     }
 
     // fma fabs(x), fabs(x), z -> fma x, x, z
     if (match(Src0, m_Intrinsic<Intrinsic::fabs>(m_Value(LHS))) &&
         match(Src1, m_Intrinsic<Intrinsic::fabs>(m_Value(RHS))) && LHS == RHS) {
-      CallInst *NewCall = Builder->CreateCall(II->getCalledFunction(),
-                                              {LHS, LHS, II->getArgOperand(2)});
-      NewCall->takeName(II);
-      NewCall->copyFastMathFlags(II);
-      return replaceInstUsesWith(*II, NewCall);
+      II->setArgOperand(0, LHS);
+      II->setArgOperand(1, RHS);
+      return II;
     }
 
     // fma x, 1, z -> fadd x, z