[llvm] [TargetLowering] Use Correct VT for Multi-out Asm (PR #116024)

[Sam Elliott via llvm-commits]

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@@ -5753,7 +5753,8 @@ TargetLowering::ParseConstraints(const DataLayout &DL,
       assert(!Call.getType()->isVoidTy() && "Bad inline asm!");
       if (auto *STy = dyn_cast<StructType>(Call.getType())) {
         OpInfo.ConstraintVT =
-            getSimpleValueType(DL, STy->getElementType(ResNo));
+            getAsmOperandValueType(DL, STy->getElementType(ResNo))
+                .getSimpleVT();
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lenary wrote:

I don't believe the lowering from an inline assembly statement to a `call ... asm` will create a nested struct. It either returns the single type corresponding to the output (if there's one output), or a struct with a member per output (if there's multiple outputs). I think that inline asm inputs/outputs cannot themselves be structs, but I'm not 100% certain of that. This code would suggest not.

https://github.com/llvm/llvm-project/pull/116024