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