[llvm] [SDAG] Add missing float type legalizations for FMODF (PR #128055)

[Benjamin Maxwell via llvm-commits]

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@@ -2616,6 +2624,18 @@ bool SelectionDAG::expandMultipleResultFPLibCall(
 
   auto [Call, CallChain] = TLI->LowerCallTo(CLI);
 
+  if (CallRetResNo && !Node->hasAnyUseOfValue(*CallRetResNo)) {
+    // This is needed for x87, which uses a floating-point stack. If (for
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MacDue wrote:

Oh I misread the above, I guess the X86 lowering could be modified. I can take a look at that, I prefer not modifying targets to fix an issue specific to this lowering, but if the changes are simple, maybe it's the right approach. I just can't say what the other implementations would be and how much would need reworking, considering it's not a target I usually work on.

https://github.com/llvm/llvm-project/pull/128055