Fix Transforms/InstCombine/2007-05-18-CastFoldBug.ll, a bug that devastates
objc code due to the way the FE lowers objc message sends.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37256 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 0890557..db105ad 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -7773,6 +7773,14 @@
const FunctionType *FT = Callee->getFunctionType();
const Type *OldRetTy = Caller->getType();
+ const FunctionType *ActualFT =
+ cast<FunctionType>(cast<PointerType>(CE->getType())->getElementType());
+
+ // If the parameter attributes don't match up, don't do the xform. We don't
+ // want to lose an sret attribute or something.
+ if (FT->getParamAttrs() != ActualFT->getParamAttrs())
+ return false;
+
// Check to see if we are changing the return type...
if (OldRetTy != FT->getReturnType()) {
if (Callee->isDeclaration() && !Caller->use_empty() &&