29 lines
1.1 KiB
LLVM
29 lines
1.1 KiB
LLVM
; Test to make sure unused llvm.invariant.start calls are not trivially eliminated
|
|
; RUN: opt < %s -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
|
|
}
|