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; RUN: opt -S -early-cse < %s | FileCheck %s
; RUN: opt -S -gvn < %s | FileCheck %s
; RUN: opt -S -newgvn < %s | FileCheck %s
; RUN: opt -S -O3 < %s | FileCheck %s
; These tests checks if passes with CSE functionality can do CSE on
; invariant.group.barrier, that is prohibited if there is a memory clobber
; between barriers call.
; CHECK-LABEL: define i8 @optimizable()
define i8 @optimizable() {
entry:
%ptr = alloca i8
store i8 42, i8* %ptr, !invariant.group !0
; CHECK: call i8* @llvm.invariant.group.barrier
%ptr2 = call i8* @llvm.invariant.group.barrier(i8* %ptr)
; CHECK-NOT: call i8* @llvm.invariant.group.barrier
%ptr3 = call i8* @llvm.invariant.group.barrier(i8* %ptr)
; CHECK: call void @clobber(i8* {{.*}}%ptr)
call void @clobber(i8* %ptr)
; CHECK: call void @use(i8* {{.*}}%ptr2)
call void @use(i8* %ptr2)
; CHECK: call void @use(i8* {{.*}}%ptr2)
call void @use(i8* %ptr3)
; CHECK: load i8, i8* %ptr2, {{.*}}!invariant.group
%v = load i8, i8* %ptr3, !invariant.group !0
ret i8 %v
}
; CHECK-LABEL: define i8 @unoptimizable()
define i8 @unoptimizable() {
entry:
%ptr = alloca i8
store i8 42, i8* %ptr, !invariant.group !0
; CHECK: call i8* @llvm.invariant.group.barrier
%ptr2 = call i8* @llvm.invariant.group.barrier(i8* %ptr)
call void @clobber(i8* %ptr)
; CHECK: call i8* @llvm.invariant.group.barrier
%ptr3 = call i8* @llvm.invariant.group.barrier(i8* %ptr)
; CHECK: call void @clobber(i8* {{.*}}%ptr)
call void @clobber(i8* %ptr)
; CHECK: call void @use(i8* {{.*}}%ptr2)
call void @use(i8* %ptr2)
; CHECK: call void @use(i8* {{.*}}%ptr3)
call void @use(i8* %ptr3)
; CHECK: load i8, i8* %ptr3, {{.*}}!invariant.group
%v = load i8, i8* %ptr3, !invariant.group !0
ret i8 %v
}
declare void @use(i8* readonly)
declare void @clobber(i8*)
; CHECK: Function Attrs: argmemonly nounwind readonly
; CHECK-NEXT: declare i8* @llvm.invariant.group.barrier(i8*)
declare i8* @llvm.invariant.group.barrier(i8*)
!0 = !{}
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