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llvm-6502/test/Transforms/ObjCARC/contract-storestrong.ll
Michael Gottesman 391935a017 [objc-arc-contract] We can not move retains over instructions which can not conservatively be proven to not decrement the retain's RCIdentity. 
I also cleaned up the code to make it more understandable for mere mortals.

<rdar://problem/19853758>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229937 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-20 00:02:49 +00:00

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; RUN: opt -objc-arc-contract -S < %s | FileCheck %s
target datalayout = "e-p:64:64:64"
declare i8* @objc_retain(i8*)
declare void @objc_release(i8*)
declare void @use_pointer(i8*)
@x = external global i8*
; CHECK-LABEL: define void @test0(
; CHECK: entry:
; CHECK-NEXT: tail call void @objc_storeStrong(i8** @x, i8* %p) [[NUW:#[0-9]+]]
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test0(i8* %p) {
entry:
%0 = tail call i8* @objc_retain(i8* %p) nounwind
%tmp = load i8** @x, align 8
store i8* %0, i8** @x, align 8
tail call void @objc_release(i8* %tmp) nounwind
ret void
}
; Don't do this if the load is volatile.
; CHECK-LABEL: define void @test1(i8* %p) {
; CHECK-NEXT: entry:
; CHECK-NEXT: %0 = tail call i8* @objc_retain(i8* %p) [[NUW]]
; CHECK-NEXT: %tmp = load volatile i8** @x, align 8
; CHECK-NEXT: store i8* %0, i8** @x, align 8
; CHECK-NEXT: tail call void @objc_release(i8* %tmp) [[NUW]]
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test1(i8* %p) {
entry:
%0 = tail call i8* @objc_retain(i8* %p) nounwind
%tmp = load volatile i8** @x, align 8
store i8* %0, i8** @x, align 8
tail call void @objc_release(i8* %tmp) nounwind
ret void
}
; Don't do this if the store is volatile.
; CHECK-LABEL: define void @test2(i8* %p) {
; CHECK-NEXT: entry:
; CHECK-NEXT: %0 = tail call i8* @objc_retain(i8* %p) [[NUW]]
; CHECK-NEXT: %tmp = load i8** @x, align 8
; CHECK-NEXT: store volatile i8* %0, i8** @x, align 8
; CHECK-NEXT: tail call void @objc_release(i8* %tmp) [[NUW]]
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test2(i8* %p) {
entry:
%0 = tail call i8* @objc_retain(i8* %p) nounwind
%tmp = load i8** @x, align 8
store volatile i8* %0, i8** @x, align 8
tail call void @objc_release(i8* %tmp) nounwind
ret void
}
; Don't do this if there's a use of the old pointer value between the store
; and the release.
; CHECK-LABEL: define void @test3(i8* %newValue) {
; CHECK-NEXT: entry:
; CHECK-NEXT: %x0 = tail call i8* @objc_retain(i8* %newValue) [[NUW]]
; CHECK-NEXT: %x1 = load i8** @x, align 8
; CHECK-NEXT: store i8* %x0, i8** @x, align 8
; CHECK-NEXT: tail call void @use_pointer(i8* %x1), !clang.arc.no_objc_arc_exceptions !0
; CHECK-NEXT: tail call void @objc_release(i8* %x1) [[NUW]], !clang.imprecise_release !0
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test3(i8* %newValue) {
entry:
%x0 = tail call i8* @objc_retain(i8* %newValue) nounwind
%x1 = load i8** @x, align 8
store i8* %newValue, i8** @x, align 8
tail call void @use_pointer(i8* %x1), !clang.arc.no_objc_arc_exceptions !0
tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0
ret void
}
; Like test3, but with an icmp use instead of a call, for good measure.
; CHECK-LABEL: define i1 @test4(i8* %newValue, i8* %foo) {
; CHECK-NEXT: entry:
; CHECK-NEXT: %x0 = tail call i8* @objc_retain(i8* %newValue) [[NUW]]
; CHECK-NEXT: %x1 = load i8** @x, align 8
; CHECK-NEXT: store i8* %x0, i8** @x, align 8
; CHECK-NEXT: %t = icmp eq i8* %x1, %foo
; CHECK-NEXT: tail call void @objc_release(i8* %x1) [[NUW]], !clang.imprecise_release !0
; CHECK-NEXT: ret i1 %t
; CHECK-NEXT: }
define i1 @test4(i8* %newValue, i8* %foo) {
entry:
%x0 = tail call i8* @objc_retain(i8* %newValue) nounwind
%x1 = load i8** @x, align 8
store i8* %newValue, i8** @x, align 8
%t = icmp eq i8* %x1, %foo
tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0
ret i1 %t
}
; Do form an objc_storeStrong here, because the use is before the store.
; CHECK-LABEL: define i1 @test5(i8* %newValue, i8* %foo) {
; CHECK: %t = icmp eq i8* %x1, %foo
; CHECK: tail call void @objc_storeStrong(i8** @x, i8* %newValue) [[NUW]]
; CHECK: }
define i1 @test5(i8* %newValue, i8* %foo) {
entry:
%x0 = tail call i8* @objc_retain(i8* %newValue) nounwind
%x1 = load i8** @x, align 8
%t = icmp eq i8* %x1, %foo
store i8* %newValue, i8** @x, align 8
tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0
ret i1 %t
}
; Like test5, but the release is before the store.
; CHECK-LABEL: define i1 @test6(i8* %newValue, i8* %foo) {
; CHECK: %t = icmp eq i8* %x1, %foo
; CHECK: tail call void @objc_storeStrong(i8** @x, i8* %newValue) [[NUW]]
; CHECK: }
define i1 @test6(i8* %newValue, i8* %foo) {
entry:
%x0 = tail call i8* @objc_retain(i8* %newValue) nounwind
%x1 = load i8** @x, align 8
tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0
%t = icmp eq i8* %x1, %foo
store i8* %newValue, i8** @x, align 8
ret i1 %t
}
; Like test0, but there's no store, so don't form an objc_storeStrong.
; CHECK-LABEL: define void @test7(
; CHECK-NEXT: entry:
; CHECK-NEXT: %0 = tail call i8* @objc_retain(i8* %p) [[NUW]]
; CHECK-NEXT: %tmp = load i8** @x, align 8
; CHECK-NEXT: tail call void @objc_release(i8* %tmp) [[NUW]]
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test7(i8* %p) {
entry:
%0 = tail call i8* @objc_retain(i8* %p) nounwind
%tmp = load i8** @x, align 8
tail call void @objc_release(i8* %tmp) nounwind
ret void
}
; Like test0, but there's no retain, so don't form an objc_storeStrong.
; CHECK-LABEL: define void @test8(
; CHECK-NEXT: entry:
; CHECK-NEXT: %tmp = load i8** @x, align 8
; CHECK-NEXT: store i8* %p, i8** @x, align 8
; CHECK-NEXT: tail call void @objc_release(i8* %tmp) [[NUW]]
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test8(i8* %p) {
entry:
%tmp = load i8** @x, align 8
store i8* %p, i8** @x, align 8
tail call void @objc_release(i8* %tmp) nounwind
ret void
}
; Make sure that we properly handle release that *may* release our new
; value in between the retain and the store. We need to be sure that
; this we can safely move the retain to the store. This specific test
; makes sure that we properly handled a release of an unrelated
; pointer.
;
; CHECK-LABEL: define i1 @test9(i8* %newValue, i8* %foo, i8* %unrelated_ptr) {
; CHECK-NOT: objc_storeStrong
define i1 @test9(i8* %newValue, i8* %foo, i8* %unrelated_ptr) {
entry:
%x0 = tail call i8* @objc_retain(i8* %newValue) nounwind
tail call void @objc_release(i8* %unrelated_ptr) nounwind, !clang.imprecise_release !0
%x1 = load i8** @x, align 8
tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0
%t = icmp eq i8* %x1, %foo
store i8* %newValue, i8** @x, align 8
ret i1 %t
}
; Make sure that we don't perform the optimization when we just have a call.
;
; CHECK-LABEL: define i1 @test10(i8* %newValue, i8* %foo, i8* %unrelated_ptr) {
; CHECK-NOT: objc_storeStrong
define i1 @test10(i8* %newValue, i8* %foo, i8* %unrelated_ptr) {
entry:
%x0 = tail call i8* @objc_retain(i8* %newValue) nounwind
call void @use_pointer(i8* %unrelated_ptr)
%x1 = load i8** @x, align 8
tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0
%t = icmp eq i8* %x1, %foo
store i8* %newValue, i8** @x, align 8
ret i1 %t
}
; Make sure we form the store strong if the use in between the retain
; and the store does not touch reference counts.
; CHECK-LABEL: define i1 @test11(i8* %newValue, i8* %foo, i8* %unrelated_ptr) {
; CHECK: objc_storeStrong
define i1 @test11(i8* %newValue, i8* %foo, i8* %unrelated_ptr) {
entry:
%x0 = tail call i8* @objc_retain(i8* %newValue) nounwind
%t = icmp eq i8* %newValue, %foo
%x1 = load i8** @x, align 8
tail call void @objc_release(i8* %x1) nounwind, !clang.imprecise_release !0
store i8* %newValue, i8** @x, align 8
ret i1 %t
}
!0 = !{}
; CHECK: attributes [[NUW]] = { nounwind }
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