[PATCH] D135738: [InstCombine] Bail out of casting calls when a conversion to byval is involved.

[Mike Hommey via Phabricator via llvm-commits]

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Fixes #58307


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135738

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp


Index: llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -3395,6 +3395,10 @@
     if (CallerPAL.hasParamAttr(i, Attribute::SwiftError))
       return false;
 
+    if (!CallerPAL.hasParamAttr(i, Attribute::ByVal) &&
+        Callee->getAttributes().hasParamAttr(i, Attribute::ByVal))
+      return false; // Cannot transform to byval.
+
     // If the parameter is passed as a byval argument, then we have to have a
     // sized type and the sized type has to have the same size as the old type.
     if (ParamTy != ActTy && CallerPAL.hasParamAttr(i, Attribute::ByVal)) {


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