[IPO/MergeFunctions] changes so it doesn't try to bitcast a struct return type but instead recreates it with insert/extract value.

llvm-svn: 207679

1 files changed, 40 insertions, 0 deletions

diff --git a/llvm/test/Transforms/MergeFunc/mergefunc-struct-return.ll b/llvm/test/Transforms/MergeFunc/mergefunc-struct-return.ll
new file mode 100644
index 00000000000..d2cbe43da0c
--- /dev/null
+++ b/llvm/test/Transforms/MergeFunc/mergefunc-struct-return.ll
@@ -0,0 +1,40 @@
+; 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
+}