// Helper for writeThunk,
// Selects proper bitcast operation,
// but a bit simpler then CastInst::getCastOpcode.
-static Value* createCast(IRBuilder<false> &Builder, Value *V, Type *DestTy) {
+static Value *createCast(IRBuilder<false> &Builder, Value *V, Type *DestTy) {
Type *SrcTy = V->getType();
+ if (SrcTy->isStructTy()) {
+ assert(DestTy->isStructTy());
+ assert(SrcTy->getStructNumElements() == DestTy->getStructNumElements());
+ Value *Result = UndefValue::get(DestTy);
+ for (unsigned int I = 0, E = SrcTy->getStructNumElements(); I < E; ++I) {
+ Value *Element = createCast(
+ Builder, Builder.CreateExtractValue(V, ArrayRef<unsigned int>(I)),
+ DestTy->getStructElementType(I));
+
+ Result =
+ Builder.CreateInsertValue(Result, Element, ArrayRef<unsigned int>(I));
+ }
+ return Result;
+ }
+ assert(!DestTy->isStructTy());
if (SrcTy->isIntegerTy() && DestTy->isPointerTy())
return Builder.CreateIntToPtr(V, DestTy);
else if (SrcTy->isPointerTy() && DestTy->isIntegerTy())
--- /dev/null
+; RUN: opt -mergefunc -S < %s | FileCheck %s
+
+; This test makes sure that the mergefunc pass, uses extract and insert value
+; to convert the struct result type; as struct types cannot be bitcast.
+
+target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
+
+%kv1 = type { i32*, i32* }
+%kv2 = type { i8*, i8* }
+
+declare void @noop()
+
+define %kv1 @fn1() {
+; CHECK-LABEL: @fn1(
+ %tmp = alloca %kv1
+ %v1 = getelementptr %kv1* %tmp, i32 0, i32 0
+ store i32* null, i32** %v1
+ %v2 = getelementptr %kv1* %tmp, i32 0, i32 0
+ store i32* null, i32** %v2
+ call void @noop()
+ %v3 = load %kv1* %tmp
+ ret %kv1 %v3
+}
+
+define %kv2 @fn2() {
+; CHECK-LABEL: @fn2(
+; CHECK: %1 = tail call %kv1 @fn1()
+; CHECK: %2 = extractvalue %kv1 %1, 0
+; CHECK: %3 = bitcast i32* %2 to i8*
+; CHECK: %4 = insertvalue %kv2 undef, i8* %3, 0
+ %tmp = alloca %kv2
+ %v1 = getelementptr %kv2* %tmp, i32 0, i32 0
+ store i8* null, i8** %v1
+ %v2 = getelementptr %kv2* %tmp, i32 0, i32 0
+ store i8* null, i8** %v2
+ call void @noop()
+
+ %v3 = load %kv2* %tmp
+ ret %kv2 %v3
+}