[llvm] [LV][VPlan] set FastMathFlags on EVLRecipe (PR #119847)

[via llvm-commits]

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@@ -976,8 +976,11 @@ void VPWidenIntrinsicRecipe::execute(VPTransformState &State) {
     CI->getOperandBundlesAsDefs(OpBundles);
 
   CallInst *V = State.Builder.CreateCall(VectorF, Args, OpBundles);
-
-  setFlags(V);
+  // vector-predication intrinsics only accept FMF flags, while vector intrinsic
+  // can support all flags.
+  bool VPIntrinsic = VPIntrinsic::isVPIntrinsic(VectorIntrinsicID);
+  if ((VPIntrinsic && isa<FPMathOperator>(V)) || !VPIntrinsic)
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LiqinWeng wrote:

1. VP intrinsic and non-vp intrinsic flags may not be completely consistent， eg: uitofp has the nneg IR flags, but llvm.vp.uitofp seems no this flag
2. Does the current VP intrinsic support other flags? Not yet, can we support fastmath flags first?


https://github.com/llvm/llvm-project/pull/119847