derek.holloway
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139 lines
4.3 KiB
LLVM
139 lines
4.3 KiB
LLVM
; RUN: opt -S -passes=objc-arc < %s | FileCheck %s
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declare ptr @llvm.objc.loadWeak(ptr)
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declare ptr @llvm.objc.loadWeakRetained(ptr)
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declare ptr @llvm.objc.storeWeak(ptr, ptr)
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declare ptr @llvm.objc.initWeak(ptr, ptr)
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declare void @use_pointer(ptr)
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declare void @callee()
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; Basic redundant @llvm.objc.loadWeak elimination.
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; CHECK: define void @test0(ptr %p) {
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; CHECK-NEXT: %y = call ptr @llvm.objc.loadWeak(ptr %p)
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; CHECK-NEXT: call void @use_pointer(ptr %y)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test0(ptr %p) {
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%x = call ptr @llvm.objc.loadWeak(ptr %p)
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%y = call ptr @llvm.objc.loadWeak(ptr %p)
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call void @use_pointer(ptr %y)
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ret void
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}
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; DCE the @llvm.objc.loadWeak.
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; CHECK: define void @test1(ptr %p) {
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; CHECK-NEXT: %y = call ptr @llvm.objc.loadWeakRetained(ptr %p)
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; CHECK-NEXT: call void @use_pointer(ptr %y)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test1(ptr %p) {
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%x = call ptr @llvm.objc.loadWeak(ptr %p)
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%y = call ptr @llvm.objc.loadWeakRetained(ptr %p)
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call void @use_pointer(ptr %y)
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ret void
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}
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; Basic redundant @llvm.objc.loadWeakRetained elimination.
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; CHECK: define void @test2(ptr %p) {
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; CHECK-NEXT: %x = call ptr @llvm.objc.loadWeak(ptr %p)
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; CHECK-NEXT: store i8 3, ptr %x
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; CHECK-NEXT: %1 = tail call ptr @llvm.objc.retain(ptr %x)
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; CHECK-NEXT: call void @use_pointer(ptr %x)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test2(ptr %p) {
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%x = call ptr @llvm.objc.loadWeak(ptr %p)
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store i8 3, ptr %x
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%y = call ptr @llvm.objc.loadWeakRetained(ptr %p)
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call void @use_pointer(ptr %y)
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ret void
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}
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; Basic redundant @llvm.objc.loadWeakRetained elimination, this time
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; with a readonly call instead of a store.
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; CHECK: define void @test3(ptr %p) {
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; CHECK-NEXT: %x = call ptr @llvm.objc.loadWeak(ptr %p)
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; CHECK-NEXT: call void @use_pointer(ptr %x) [[RO:#[0-9]+]]
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; CHECK-NEXT: %1 = tail call ptr @llvm.objc.retain(ptr %x)
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; CHECK-NEXT: call void @use_pointer(ptr %x)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test3(ptr %p) {
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%x = call ptr @llvm.objc.loadWeak(ptr %p)
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call void @use_pointer(ptr %x) readonly
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%y = call ptr @llvm.objc.loadWeakRetained(ptr %p)
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call void @use_pointer(ptr %y)
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ret void
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}
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; A regular call blocks redundant weak load elimination.
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; CHECK: define void @test4(ptr %p) {
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; CHECK-NEXT: %x = call ptr @llvm.objc.loadWeak(ptr %p)
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; CHECK-NEXT: call void @use_pointer(ptr %x) [[RO]]
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; CHECK-NEXT: call void @callee()
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; CHECK-NEXT: %y = call ptr @llvm.objc.loadWeak(ptr %p)
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; CHECK-NEXT: call void @use_pointer(ptr %y)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test4(ptr %p) {
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%x = call ptr @llvm.objc.loadWeak(ptr %p)
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call void @use_pointer(ptr %x) readonly
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call void @callee()
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%y = call ptr @llvm.objc.loadWeak(ptr %p)
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call void @use_pointer(ptr %y)
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ret void
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}
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; Store to load forwarding.
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; CHECK: define void @test5(ptr %p, ptr %n) {
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; CHECK-NEXT: %1 = call ptr @llvm.objc.storeWeak(ptr %p, ptr %n)
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; CHECK-NEXT: call void @use_pointer(ptr %n)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test5(ptr %p, ptr %n) {
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call ptr @llvm.objc.storeWeak(ptr %p, ptr %n)
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%y = call ptr @llvm.objc.loadWeak(ptr %p)
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call void @use_pointer(ptr %y)
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ret void
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}
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; Store to load forwarding with objc_initWeak.
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; CHECK: define void @test6(ptr %p, ptr %n) {
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; CHECK-NEXT: %1 = call ptr @llvm.objc.initWeak(ptr %p, ptr %n)
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; CHECK-NEXT: call void @use_pointer(ptr %n)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test6(ptr %p, ptr %n) {
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call ptr @llvm.objc.initWeak(ptr %p, ptr %n)
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%y = call ptr @llvm.objc.loadWeak(ptr %p)
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call void @use_pointer(ptr %y)
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ret void
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}
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; Don't forward if there's a may-alias store in the way.
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; CHECK: define void @test7(ptr %p, ptr %n, ptr %q, ptr %m) {
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; CHECK-NEXT: call ptr @llvm.objc.initWeak(ptr %p, ptr %n)
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; CHECK-NEXT: call ptr @llvm.objc.storeWeak(ptr %q, ptr %m)
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; CHECK-NEXT: %y = call ptr @llvm.objc.loadWeak(ptr %p)
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; CHECK-NEXT: call void @use_pointer(ptr %y)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test7(ptr %p, ptr %n, ptr %q, ptr %m) {
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call ptr @llvm.objc.initWeak(ptr %p, ptr %n)
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call ptr @llvm.objc.storeWeak(ptr %q, ptr %m)
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%y = call ptr @llvm.objc.loadWeak(ptr %p)
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call void @use_pointer(ptr %y)
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ret void
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}
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; CHECK: attributes #0 = { nounwind }
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; CHECK: attributes [[RO]] = { memory(read) }
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