1; RUN: opt < %s -deadargelim -S | FileCheck %s
2
3%Ty = type <{ i32, i32 }>
4
5; Check if the pass doesn't modify anything that doesn't need changing. We feed
6; an unused argument to each function to lure it into changing _something_ about
7; the function and then changing too much.
8
9; This checks if the return value attributes are not removed
10; CHECK: define internal zeroext i32 @test1() #0
11define internal zeroext i32 @test1(i32 %DEADARG1) nounwind {
12        ret i32 1
13}
14
15; This checks if the struct doesn't get non-packed
16; CHECK-LABEL: define internal <{ i32, i32 }> @test2(
17define internal <{ i32, i32 }> @test2(i32 %DEADARG1) {
18        ret <{ i32, i32 }> <{ i32 1, i32 2 }>
19}
20
21; We use this external function to make sure the return values don't become dead
22declare void @user(i32, <{ i32, i32 }>)
23
24define void @caller() {
25        %B = call i32 @test1(i32 1)
26        %C = call <{ i32, i32 }> @test2(i32 2)
27        call void @user(i32 %B, <{ i32, i32 }> %C)
28        ret void
29}
30
31; We can't remove 'this' here, as that would put argmem in ecx instead of
32; memory.
33define internal x86_thiscallcc i32 @unused_this(i32* %this, i32* inalloca %argmem) {
34	%v = load i32, i32* %argmem
35	ret i32 %v
36}
37; CHECK-LABEL: define internal x86_thiscallcc i32 @unused_this(i32* %this, i32* inalloca %argmem)
38
39define i32 @caller2() {
40	%t = alloca i32
41	%m = alloca inalloca i32
42	store i32 42, i32* %m
43	%v = call x86_thiscallcc i32 @unused_this(i32* %t, i32* inalloca %m)
44	ret i32 %v
45}
46
47; CHECK: attributes #0 = { nounwind }
48