--- /dev/null
+; RUN: llvm-as < %s | opt -deadargelim | llvm-dis > %t
+; RUN: cat %t | grep {define internal \{ \} @test}
+; RUN: cat %t | grep {define internal \{ i32 \} @test}
+; RUN: cat %t | grep {define internal \<\{ i32, i32 \}\> @test}
+
+; Check if the pass doesn't modify anything that doesn't need changing. We feed
+; an unused argument to each function to lure it into changing _something_ about
+; the function and then changing to much.
+
+
+; This checks if the struct retval isn't changed into a void
+define internal { } @test(i32 %DEADARG1) {
+ ret { } { }
+}
+
+; This checks if the struct retval isn't removed
+define internal {i32} @test1(i32 %DEADARG1) {
+ ret { i32 } { i32 1 }
+}
+
+; This checks if the struct doesn't get non-packed
+define internal <{ i32, i32 }> @test2(i32 %DEADARG1) {
+ ret <{ i32, i32 }> <{ i32 1, i32 2 }>
+}
+
+; We use this external function to make sure the return values don't become dead
+declare void @user({ }, { i32 }, <{ i32, i32 }>)
+
+define void @caller() {
+ %A = call { } @test(i32 0)
+ %B = call { i32 } @test1(i32 1)
+ %C = call <{ i32, i32 }> @test2(i32 2)
+ call void @user({ } %A, { i32 } %B, <{ i32, i32 }> %C)
+ ret void
+}
+