1; Test to make sure unused llvm.invariant.start calls are not trivially eliminated
2; RUN: opt < %s -instcombine -S | FileCheck %s
3
4declare void @g(i8*)
5declare void @g_addr1(i8 addrspace(1)*)
6
7declare {}* @llvm.invariant.start.p0i8(i64, i8* nocapture) nounwind readonly
8declare {}* @llvm.invariant.start.p1i8(i64, i8 addrspace(1)* nocapture) nounwind readonly
9
10define i8 @f() {
11  %a = alloca i8                                  ; <i8*> [#uses=4]
12  store i8 0, i8* %a
13  %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %a) ; <{}*> [#uses=0]
14  ; CHECK: call {}* @llvm.invariant.start.p0i8
15  call void @g(i8* %a)
16  %r = load i8, i8* %a                                ; <i8> [#uses=1]
17  ret i8 %r
18}
19
20; make sure llvm.invariant.call in non-default addrspace are also not eliminated.
21define i8 @f_addrspace1(i8 addrspace(1)* %a) {
22  store i8 0, i8 addrspace(1)* %a
23  %i = call {}* @llvm.invariant.start.p1i8(i64 1, i8 addrspace(1)* %a) ; <{}*> [#uses=0]
24  ; CHECK: call {}* @llvm.invariant.start.p1i8
25  call void @g_addr1(i8 addrspace(1)* %a)
26  %r = load i8, i8 addrspace(1)* %a                                ; <i8> [#uses=1]
27  ret i8 %r
28}
29