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1; RUN: opt -passes=objc-arc -S < %s | FileCheck %s2 3declare void @llvm.objc.release(ptr %x)4declare ptr @llvm.objc.retain(ptr %x)5declare ptr @llvm.objc.autorelease(ptr %x)6declare ptr @llvm.objc.autoreleaseReturnValue(ptr %x)7declare ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %x)8declare ptr @llvm.objc.unsafeClaimAutoreleasedReturnValue(ptr %x)9declare ptr @tmp(ptr)10 11; Never tail call objc_autorelease.12 13; CHECK: define ptr @test0(ptr %x) [[NUW:#[0-9]+]] {14; CHECK: %tmp0 = call ptr @llvm.objc.autorelease(ptr %x) [[NUW]]15; CHECK: %tmp1 = call ptr @llvm.objc.autorelease(ptr %x) [[NUW]]16; CHECK: }17define ptr @test0(ptr %x) nounwind {18entry:19 %tmp0 = call ptr @llvm.objc.autorelease(ptr %x)20 %tmp1 = tail call ptr @llvm.objc.autorelease(ptr %x)21 22 ret ptr %x23}24 25; Always tail call autoreleaseReturnValue.26 27; CHECK: define ptr @test1(ptr %x) [[NUW]] {28; CHECK: %tmp0 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %x) [[NUW]]29; CHECK: %tmp1 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %x) [[NUW]]30; CHECK: }31define ptr @test1(ptr %x) nounwind {32entry:33 %tmp0 = call ptr @llvm.objc.autoreleaseReturnValue(ptr %x)34 %tmp1 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %x)35 ret ptr %x36}37 38; Always tail call objc_retain.39 40; CHECK: define ptr @test2(ptr %x) [[NUW]] {41; CHECK: %tmp0 = tail call ptr @llvm.objc.retain(ptr %x) [[NUW]]42; CHECK: %tmp1 = tail call ptr @llvm.objc.retain(ptr %x) [[NUW]]43; CHECK: }44define ptr @test2(ptr %x) nounwind {45entry:46 %tmp0 = call ptr @llvm.objc.retain(ptr %x)47 %tmp1 = tail call ptr @llvm.objc.retain(ptr %x)48 ret ptr %x49}50 51; Always tail call objc_retainAutoreleasedReturnValue unless it's annotated with52; notail.53; CHECK: define ptr @test3(ptr %x) [[NUW]] {54; CHECK: %tmp0 = tail call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %y) [[NUW]]55; CHECK: %tmp1 = tail call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %z) [[NUW]]56; CHECK: %tmp2 = notail call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %z2) [[NUW]]57; CHECK: }58define ptr @test3(ptr %x) nounwind {59entry:60 %y = call ptr @tmp(ptr %x)61 %tmp0 = call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %y)62 %z = call ptr @tmp(ptr %x)63 %tmp1 = tail call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %z)64 %z2 = call ptr @tmp(ptr %x)65 %tmp2 = notail call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %z2)66 ret ptr %x67}68 69; By itself, we should never change whether or not objc_release is tail called.70 71; CHECK: define void @test4(ptr %x) [[NUW]] {72; CHECK: call void @llvm.objc.release(ptr %x) [[NUW]]73; CHECK: tail call void @llvm.objc.release(ptr %x) [[NUW]]74; CHECK: }75define void @test4(ptr %x) nounwind {76entry:77 call void @llvm.objc.release(ptr %x)78 tail call void @llvm.objc.release(ptr %x)79 ret void80}81 82; If we convert a tail called @llvm.objc.autoreleaseReturnValue to an83; @llvm.objc.autorelease, ensure that the tail call is removed.84; CHECK: define ptr @test5(ptr %x) [[NUW]] {85; CHECK: %tmp0 = call ptr @llvm.objc.autorelease(ptr %x) [[NUW]]86; CHECK: }87define ptr @test5(ptr %x) nounwind {88entry:89 %tmp0 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %x)90 ret ptr %tmp091}92 93; Always tail call llvm.objc.unsafeClaimAutoreleasedReturnValue.94; CHECK: define ptr @test6(ptr %x) [[NUW]] {95; CHECK: %tmp0 = tail call ptr @llvm.objc.unsafeClaimAutoreleasedReturnValue(ptr %y) [[NUW]]96; CHECK: %tmp1 = tail call ptr @llvm.objc.unsafeClaimAutoreleasedReturnValue(ptr %z) [[NUW]]97; CHECK: }98define ptr @test6(ptr %x) nounwind {99entry:100 %y = call ptr @tmp(ptr %x)101 %tmp0 = call ptr @llvm.objc.unsafeClaimAutoreleasedReturnValue(ptr %y)102 %z = call ptr @tmp(ptr %x)103 %tmp1 = tail call ptr @llvm.objc.unsafeClaimAutoreleasedReturnValue(ptr %z)104 ret ptr %x105}106 107; CHECK: attributes [[NUW]] = { nounwind }108 109