1; RUN: opt -S -passes=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, ptr, ptr, ptr, ptr } 7%1 = type <{ ptr, i32, i32, ptr, ptr, ptr }> 8%struct.__block_descriptor = type { i64, i64 } 9 10@_NSConcreteStackBlock = external global ptr 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, ptr @__copy_helper_block_, ptr @__destroy_helper_block_, ptr @.str, ptr @"\01L_OBJC_CLASS_NAME_" } 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 ptr] [ptr @"\01L_OBJC_CLASS_NAME_", ptr @"\01L_OBJC_IMAGE_INFO"], 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 ptr @bar() 22; CHECK-NEXT: call void @use(ptr %call) [[NUW:#[0-9]+]] 23; CHECK-NEXT: ret void 24; CHECK-NEXT: } 25define void @foo() { 26entry: 27 %w = alloca ptr, align 8 28 %x = alloca ptr, align 8 29 %call = call ptr @bar() 30 %0 = call ptr @llvm.objc.initWeak(ptr %w, ptr %call) nounwind 31 %1 = call ptr @llvm.objc.loadWeak(ptr %w) nounwind 32 %2 = call ptr @llvm.objc.initWeak(ptr %x, ptr %1) nounwind 33 %3 = call ptr @llvm.objc.loadWeak(ptr %x) nounwind 34 call void @use(ptr %3) nounwind 35 call void @llvm.objc.destroyWeak(ptr %x) nounwind 36 call void @llvm.objc.destroyWeak(ptr %w) nounwind 37 ret void 38} 39 40; Eliminate unnecessary weak pointer copies in a block initialization. 41 42; CHECK: define void @qux(ptr %me) #0 { 43; CHECK-NEXT: entry: 44; CHECK-NEXT: %block = alloca %1, align 8 45; CHECK-NOT: alloca 46; CHECK: } 47define void @qux(ptr %me) nounwind { 48entry: 49 %w = alloca ptr, align 8 50 %block = alloca %1, align 8 51 %0 = call ptr @llvm.objc.retain(ptr %me) nounwind 52 %1 = call ptr @llvm.objc.initWeak(ptr %w, ptr %0) nounwind 53 store ptr @_NSConcreteStackBlock, ptr %block, align 8 54 %block.flags = getelementptr inbounds %1, ptr %block, i64 0, i32 1 55 store i32 1107296256, ptr %block.flags, align 8 56 %block.reserved = getelementptr inbounds %1, ptr %block, i64 0, i32 2 57 store i32 0, ptr %block.reserved, align 4 58 %block.invoke = getelementptr inbounds %1, ptr %block, i64 0, i32 3 59 store ptr @__qux_block_invoke_0, ptr %block.invoke, align 8 60 %block.descriptor = getelementptr inbounds %1, ptr %block, i64 0, i32 4 61 store ptr @__block_descriptor_tmp, ptr %block.descriptor, align 8 62 %block.captured = getelementptr inbounds %1, ptr %block, i64 0, i32 5 63 %2 = call ptr @llvm.objc.loadWeak(ptr %w) nounwind 64 %3 = call ptr @llvm.objc.initWeak(ptr %block.captured, ptr %2) nounwind 65 call void @use_block(ptr %block) nounwind 66 call void @llvm.objc.destroyWeak(ptr %block.captured) nounwind 67 call void @llvm.objc.destroyWeak(ptr %w) nounwind 68 call void @llvm.objc.release(ptr %0) nounwind, !clang.imprecise_release !0 69 ret void 70} 71 72declare ptr @llvm.objc.retain(ptr) 73declare void @use_block(ptr) nounwind 74declare void @__qux_block_invoke_0(ptr %.block_descriptor) nounwind 75declare void @__copy_helper_block_(ptr, ptr) nounwind 76declare void @llvm.objc.copyWeak(ptr, ptr) 77declare void @__destroy_helper_block_(ptr) nounwind 78declare void @llvm.objc.release(ptr) 79declare ptr @bar() 80declare ptr @llvm.objc.initWeak(ptr, ptr) 81declare ptr @llvm.objc.loadWeak(ptr) 82declare void @use(ptr) nounwind 83declare void @llvm.objc.destroyWeak(ptr) 84 85; CHECK: attributes [[NUW]] = { nounwind } 86 87!0 = !{} 88