forked from OSchip/llvm-project
35 lines
1.2 KiB
LLVM
35 lines
1.2 KiB
LLVM
; Test to make sure llvm.invariant.start calls are not treated as clobbers.
|
|
; RUN: opt < %s -basicaa -dse -enable-dse-memoryssa -S | FileCheck %s
|
|
|
|
declare {}* @llvm.invariant.start.p0i8(i64, i8* nocapture) nounwind readonly
|
|
|
|
; We cannot remove the store 1 to %p.
|
|
; FIXME: By the semantics of invariant.start, the store 3 to p is unreachable.
|
|
define void @test(i8 *%p) {
|
|
store i8 1, i8* %p, align 4
|
|
%i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %p)
|
|
store i8 3, i8* %p, align 4
|
|
ret void
|
|
; CHECK-LABEL: @test(
|
|
; CHECK-NEXT: store i8 1, i8* %p, align 4
|
|
; CHECK-NEXT: %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %p)
|
|
; CHECK-NEXT: store i8 3, i8* %p, align 4
|
|
; CHECK-NEXT: ret void
|
|
}
|
|
|
|
; FIXME: We should be able to remove the first store to p, even though p and q
|
|
; may alias.
|
|
define void @test2(i8* %p, i8* %q) {
|
|
store i8 1, i8* %p, align 4
|
|
store i8 2, i8* %q, align 4
|
|
%i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %q)
|
|
store i8 3, i8* %p, align 4
|
|
ret void
|
|
; CHECK-LABEL: @test2(
|
|
; CHECK-NEXT: store i8 1, i8* %p, align 4
|
|
; CHECK-NEXT: store i8 2, i8* %q, align 4
|
|
; CHECK-NEXT: %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %q)
|
|
; CHECK-NEXT: store i8 3, i8* %p, align 4
|
|
; CHECK-NEXT: ret void
|
|
}
|