[llvm] [InstCombine] Fix Failure to convert vector fp comparisons that can be represented as integers #82241 (PR #83274)

[Yingwei Zheng via llvm-commits]

================
@@ -7511,6 +7525,13 @@ Instruction *InstCombinerImpl::foldFCmpIntToFPConst(FCmpInst &I,
     }
   }
 
+  if (IntTy->isVectorTy()) {
+    Value *RHSV = Builder.CreateVectorSplat(
+                     cast<VectorType>(IntTy)->getElementCount(),
+                     Builder.getInt(RHSInt));
+    return new ICmpInst(Pred, LHSI->getOperand(0), RHSV);
+  }
+
   // Lower this FP comparison into an appropriate integer version of the
   // comparison.
   return new ICmpInst(Pred, LHSI->getOperand(0), Builder.getInt(RHSInt));
----------------
dtcxzyw wrote:

```suggestion
  return new ICmpInst(Pred, LHSI->getOperand(0), ConstantInt::get(LHSI->getOperand(0)->getType(), RHSInt));
```

https://github.com/llvm/llvm-project/pull/83274