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139 lines
4.4 KiB
LLVM
139 lines
4.4 KiB
LLVM
; RUN: opt -S -basic-aa -objc-arc < %s | FileCheck %s
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declare i8* @llvm.objc.loadWeak(i8**)
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declare i8* @llvm.objc.loadWeakRetained(i8**)
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declare i8* @llvm.objc.storeWeak(i8**, i8*)
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declare i8* @llvm.objc.initWeak(i8**, i8*)
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declare void @use_pointer(i8*)
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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(i8** %p) {
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; CHECK-NEXT: %y = call i8* @llvm.objc.loadWeak(i8** %p)
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; CHECK-NEXT: call void @use_pointer(i8* %y)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test0(i8** %p) {
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%x = call i8* @llvm.objc.loadWeak(i8** %p)
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%y = call i8* @llvm.objc.loadWeak(i8** %p)
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call void @use_pointer(i8* %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(i8** %p) {
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; CHECK-NEXT: %y = call i8* @llvm.objc.loadWeakRetained(i8** %p)
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; CHECK-NEXT: call void @use_pointer(i8* %y)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test1(i8** %p) {
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%x = call i8* @llvm.objc.loadWeak(i8** %p)
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%y = call i8* @llvm.objc.loadWeakRetained(i8** %p)
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call void @use_pointer(i8* %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(i8** %p) {
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; CHECK-NEXT: %x = call i8* @llvm.objc.loadWeak(i8** %p)
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; CHECK-NEXT: store i8 3, i8* %x
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; CHECK-NEXT: %1 = tail call i8* @llvm.objc.retain(i8* %x)
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; CHECK-NEXT: call void @use_pointer(i8* %x)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test2(i8** %p) {
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%x = call i8* @llvm.objc.loadWeak(i8** %p)
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store i8 3, i8* %x
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%y = call i8* @llvm.objc.loadWeakRetained(i8** %p)
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call void @use_pointer(i8* %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(i8** %p) {
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; CHECK-NEXT: %x = call i8* @llvm.objc.loadWeak(i8** %p)
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; CHECK-NEXT: call void @use_pointer(i8* %x) [[RO:#[0-9]+]]
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; CHECK-NEXT: %1 = tail call i8* @llvm.objc.retain(i8* %x)
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; CHECK-NEXT: call void @use_pointer(i8* %x)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test3(i8** %p) {
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%x = call i8* @llvm.objc.loadWeak(i8** %p)
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call void @use_pointer(i8* %x) readonly
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%y = call i8* @llvm.objc.loadWeakRetained(i8** %p)
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call void @use_pointer(i8* %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(i8** %p) {
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; CHECK-NEXT: %x = call i8* @llvm.objc.loadWeak(i8** %p)
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; CHECK-NEXT: call void @use_pointer(i8* %x) [[RO]]
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; CHECK-NEXT: call void @callee()
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; CHECK-NEXT: %y = call i8* @llvm.objc.loadWeak(i8** %p)
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; CHECK-NEXT: call void @use_pointer(i8* %y)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test4(i8** %p) {
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%x = call i8* @llvm.objc.loadWeak(i8** %p)
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call void @use_pointer(i8* %x) readonly
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call void @callee()
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%y = call i8* @llvm.objc.loadWeak(i8** %p)
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call void @use_pointer(i8* %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(i8** %p, i8* %n) {
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; CHECK-NEXT: %1 = call i8* @llvm.objc.storeWeak(i8** %p, i8* %n)
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; CHECK-NEXT: call void @use_pointer(i8* %n)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test5(i8** %p, i8* %n) {
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call i8* @llvm.objc.storeWeak(i8** %p, i8* %n)
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%y = call i8* @llvm.objc.loadWeak(i8** %p)
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call void @use_pointer(i8* %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(i8** %p, i8* %n) {
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; CHECK-NEXT: %1 = call i8* @llvm.objc.initWeak(i8** %p, i8* %n)
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; CHECK-NEXT: call void @use_pointer(i8* %n)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test6(i8** %p, i8* %n) {
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call i8* @llvm.objc.initWeak(i8** %p, i8* %n)
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%y = call i8* @llvm.objc.loadWeak(i8** %p)
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call void @use_pointer(i8* %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(i8** %p, i8* %n, i8** %q, i8* %m) {
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; CHECK-NEXT: call i8* @llvm.objc.initWeak(i8** %p, i8* %n)
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; CHECK-NEXT: call i8* @llvm.objc.storeWeak(i8** %q, i8* %m)
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; CHECK-NEXT: %y = call i8* @llvm.objc.loadWeak(i8** %p)
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; CHECK-NEXT: call void @use_pointer(i8* %y)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test7(i8** %p, i8* %n, i8** %q, i8* %m) {
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call i8* @llvm.objc.initWeak(i8** %p, i8* %n)
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call i8* @llvm.objc.storeWeak(i8** %q, i8* %m)
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%y = call i8* @llvm.objc.loadWeak(i8** %p)
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call void @use_pointer(i8* %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]] = { readonly }
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