[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:

That's not really how X86 works. The pop is inserted as part of the lowering of the copy_from_reg, much later than the call lowering. This new node also has the advantage of working for any target without additional lowering or TLI hooks 

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