forked from OSchip/llvm-project
26 lines
770 B
LLVM
26 lines
770 B
LLVM
; XFAIL: *
|
|
; RUN: opt -basicaa -memoryssa -analyze < %s 2>&1 | FileCheck %s
|
|
; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>' -verify-memoryssa -disable-output < %s 2>&1 | FileCheck %s
|
|
;
|
|
; Invariant loads should be considered live on entry, because, once the
|
|
; location is known to be dereferenceable, the value can never change.
|
|
;
|
|
; Currently XFAILed because this optimization was held back from the initial
|
|
; commit.
|
|
|
|
@g = external global i32
|
|
|
|
declare void @clobberAllTheThings()
|
|
|
|
define i32 @foo() {
|
|
; CHECK: 1 = MemoryDef(liveOnEntry)
|
|
; CHECK-NEXT: call void @clobberAllTheThings()
|
|
call void @clobberAllTheThings()
|
|
; CHECK: MemoryUse(liveOnEntry)
|
|
; CHECK-NEXT: %1 = load i32
|
|
%1 = load i32, i32* @g, align 4, !invariant.load !0
|
|
ret i32 %1
|
|
}
|
|
|
|
!0 = !{}
|