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1; RUN: opt -S -basicaa -objc-arc < %s | FileCheck %s
2
3target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
4target triple = "x86_64-apple-darwin11.0.0"
5
6%0 = type { i64, i64, i8*, i8*, i8*, i8* }
7%1 = type <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>
8%struct.__block_descriptor = type { i64, i64 }
9
10@_NSConcreteStackBlock = external global i8*
11@.str = private unnamed_addr constant [6 x i8] c"v8@?0\00"
12@"\01L_OBJC_CLASS_NAME_" = internal global [3 x i8] c"\01@\00", section "__TEXT,__objc_classname,cstring_literals", align 1
13@__block_descriptor_tmp = internal constant %0 { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_ to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_ to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i32 0, i32 0), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @"\01L_OBJC_CLASS_NAME_", i32 0, i32 0) }
14@"\01L_OBJC_IMAGE_INFO" = internal constant [2 x i32] [i32 0, i32 16], section "__DATA, __objc_imageinfo, regular, no_dead_strip"
15@llvm.used = appending global [2 x i8*] [i8* getelementptr inbounds ([3 x i8], [3 x i8]* @"\01L_OBJC_CLASS_NAME_", i32 0, i32 0), i8* bitcast ([2 x i32]* @"\01L_OBJC_IMAGE_INFO" to i8*)], section "llvm.metadata"
16
17; Eliminate unnecessary weak pointer copies.
18
19; CHECK:      define void @foo() {
20; CHECK-NEXT: entry:
21; CHECK-NEXT:   %call = call i8* @bar()
22; CHECK-NEXT:   call void @use(i8* %call) [[NUW:#[0-9]+]]
23; CHECK-NEXT:   ret void
24; CHECK-NEXT: }
25define void @foo() {
26entry:
27  %w = alloca i8*, align 8
28  %x = alloca i8*, align 8
29  %call = call i8* @bar()
30  %0 = call i8* @objc_initWeak(i8** %w, i8* %call) nounwind
31  %1 = call i8* @objc_loadWeak(i8** %w) nounwind
32  %2 = call i8* @objc_initWeak(i8** %x, i8* %1) nounwind
33  %3 = call i8* @objc_loadWeak(i8** %x) nounwind
34  call void @use(i8* %3) nounwind
35  call void @objc_destroyWeak(i8** %x) nounwind
36  call void @objc_destroyWeak(i8** %w) nounwind
37  ret void
38}
39
40; Eliminate unnecessary weak pointer copies in a block initialization.
41
42; CHECK:      define void @qux(i8* %me) #0 {
43; CHECK-NEXT: entry:
44; CHECK-NEXT:   %block = alloca %1, align 8
45; CHECK-NOT:    alloca
46; CHECK:      }
47define void @qux(i8* %me) nounwind {
48entry:
49  %w = alloca i8*, align 8
50  %block = alloca %1, align 8
51  %0 = call i8* @objc_retain(i8* %me) nounwind
52  %1 = call i8* @objc_initWeak(i8** %w, i8* %0) nounwind
53  %block.isa = getelementptr inbounds %1, %1* %block, i64 0, i32 0
54  store i8* bitcast (i8** @_NSConcreteStackBlock to i8*), i8** %block.isa, align 8
55  %block.flags = getelementptr inbounds %1, %1* %block, i64 0, i32 1
56  store i32 1107296256, i32* %block.flags, align 8
57  %block.reserved = getelementptr inbounds %1, %1* %block, i64 0, i32 2
58  store i32 0, i32* %block.reserved, align 4
59  %block.invoke = getelementptr inbounds %1, %1* %block, i64 0, i32 3
60  store i8* bitcast (void (i8*)* @__qux_block_invoke_0 to i8*), i8** %block.invoke, align 8
61  %block.descriptor = getelementptr inbounds %1, %1* %block, i64 0, i32 4
62  store %struct.__block_descriptor* bitcast (%0* @__block_descriptor_tmp to %struct.__block_descriptor*), %struct.__block_descriptor** %block.descriptor, align 8
63  %block.captured = getelementptr inbounds %1, %1* %block, i64 0, i32 5
64  %2 = call i8* @objc_loadWeak(i8** %w) nounwind
65  %3 = call i8* @objc_initWeak(i8** %block.captured, i8* %2) nounwind
66  %4 = bitcast %1* %block to void ()*
67  call void @use_block(void ()* %4) nounwind
68  call void @objc_destroyWeak(i8** %block.captured) nounwind
69  call void @objc_destroyWeak(i8** %w) nounwind
70  call void @objc_release(i8* %0) nounwind, !clang.imprecise_release !0
71  ret void
72}
73
74declare i8* @objc_retain(i8*)
75declare void @use_block(void ()*) nounwind
76declare void @__qux_block_invoke_0(i8* %.block_descriptor) nounwind
77declare void @__copy_helper_block_(i8*, i8*) nounwind
78declare void @objc_copyWeak(i8**, i8**)
79declare void @__destroy_helper_block_(i8*) nounwind
80declare void @objc_release(i8*)
81declare i8* @bar()
82declare i8* @objc_initWeak(i8**, i8*)
83declare i8* @objc_loadWeak(i8**)
84declare void @use(i8*) nounwind
85declare void @objc_destroyWeak(i8**)
86
87; CHECK: attributes [[NUW]] = { nounwind }
88
89!0 = !{}
90