[llvm] [X86][DAGCombiner] Skip x87 fp80 values in `combineFMulOrFDivWithIntPow2` (PR #128618)

[Matt Arsenault via llvm-commits]

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@@ -17271,8 +17271,9 @@ SDValue DAGCombiner::visitFSUB(SDNode *N) {
 // prefer it.
 SDValue DAGCombiner::combineFMulOrFDivWithIntPow2(SDNode *N) {
   EVT VT = N->getValueType(0);
-  if (!Type::getFloatingPointTy(*DAG.getContext(), VT.getFltSemantics())
-           ->isIEEELikeFPTy())
+  const fltSemantics &Sem = VT.getFltSemantics();
+  if (&Sem == &APFloat::x87DoubleExtended() ||
+      &Sem == &APFloat::PPCDoubleDouble())
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arsenm wrote:

These should be an an isIEEELikeFPTy on fltSemantics, not directly inline here 

https://github.com/llvm/llvm-project/pull/128618