When inlining a functino with a byval argument, make an explicit

copy of it in case the callee modifies the struct.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45853 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 28 insertions, 0 deletions

diff --git a/test/Transforms/Inline/byval.ll b/test/Transforms/Inline/byval.ll
new file mode 100644
index 0000000000..ea8c357603
--- /dev/null
+++ b/test/Transforms/Inline/byval.ll
@@ -0,0 +1,28 @@
+; RUN: llvm-as < %s | opt -inline | llvm-dis | grep {llvm.memcpy}
+
+; Inlining a byval struct should cause an explicit copy into an alloca.
+
+	%struct.ss = type { i32, i64 }
+@.str = internal constant [10 x i8] c"%d, %lld\0A\00"		; <[10 x i8]*> [#uses=1]
+
+define internal void @f(%struct.ss* byval  %b) nounwind  {
+entry:
+	%tmp = getelementptr %struct.ss* %b, i32 0, i32 0		; <i32*> [#uses=2]
+	%tmp1 = load i32* %tmp, align 4		; <i32> [#uses=1]
+	%tmp2 = add i32 %tmp1, 1		; <i32> [#uses=1]
+	store i32 %tmp2, i32* %tmp, align 4
+	ret void
+}
+
+declare i32 @printf(i8*, ...) nounwind 
+
+define i32 @main() nounwind  {
+entry:
+	%S = alloca %struct.ss		; <%struct.ss*> [#uses=4]
+	%tmp1 = getelementptr %struct.ss* %S, i32 0, i32 0		; <i32*> [#uses=1]
+	store i32 1, i32* %tmp1, align 8
+	%tmp4 = getelementptr %struct.ss* %S, i32 0, i32 1		; <i64*> [#uses=1]
+	store i64 2, i64* %tmp4, align 4
+	call void @f( %struct.ss* byval  %S ) nounwind 
+	ret i32 0
+}