derek.holloway
7502bf64a4
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109 lines
3.2 KiB
LLVM
109 lines
3.2 KiB
LLVM
; RUN: opt -S -passes=objc-arc < %s | FileCheck %s
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declare void @use_pointer(ptr)
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declare ptr @returner()
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declare ptr @llvm.objc.retain(ptr)
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declare ptr @llvm.objc.autoreleaseReturnValue(ptr)
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declare ptr @llvm.objc.retainAutoreleasedReturnValue(ptr)
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; Clean up residue left behind after inlining.
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; CHECK-LABEL: define void @test0(
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; CHECK: entry:
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test0(ptr %call.i) {
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entry:
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%0 = tail call ptr @llvm.objc.retain(ptr %call.i) nounwind
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%1 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %0) nounwind
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ret void
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}
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; Same as test0, but with slightly different use arrangements.
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; CHECK-LABEL: define void @test1(
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; CHECK: entry:
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test1(ptr %call.i) {
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entry:
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%0 = tail call ptr @llvm.objc.retain(ptr %call.i) nounwind
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%1 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %call.i) nounwind
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ret void
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}
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; Delete a retainRV+autoreleaseRV even if the pointer is used.
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; CHECK-LABEL: define void @test24(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @use_pointer(ptr %p)
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test24(ptr %p) {
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entry:
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call ptr @llvm.objc.autoreleaseReturnValue(ptr %p) nounwind
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call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %p) nounwind
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call void @use_pointer(ptr %p)
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ret void
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}
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; Check that we can delete the autoreleaseRV+retainAutoreleasedRV pair even in
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; presence of instructions added by the inliner as part of the return sequence.
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; 1) Noop instructions: bitcasts and zero-indices GEPs.
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; CHECK-LABEL: define ptr @testNoop(
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; CHECK: entry:
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; CHECK-NEXT: ret ptr %call.i
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; CHECK-NEXT: }
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define ptr @testNoop(ptr %call.i) {
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entry:
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%0 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %call.i) nounwind
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%1 = tail call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %call.i) nounwind
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ret ptr %call.i
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}
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; 2) Lifetime markers.
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declare void @llvm.lifetime.start.p0(ptr)
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declare void @llvm.lifetime.end.p0(ptr)
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; CHECK-LABEL: define ptr @testLifetime(
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; CHECK: entry:
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; CHECK-NEXT: %obj = alloca i8
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; CHECK-NEXT: call void @llvm.lifetime.start.p0(ptr %obj)
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; CHECK-NEXT: call void @llvm.lifetime.end.p0(ptr %obj)
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; CHECK-NEXT: ret ptr %call.i
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; CHECK-NEXT: }
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define ptr @testLifetime(ptr %call.i) {
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entry:
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%obj = alloca i8
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call void @llvm.lifetime.start.p0(ptr %obj)
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%0 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %call.i) nounwind
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call void @llvm.lifetime.end.p0(ptr %obj)
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%1 = tail call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %call.i) nounwind
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ret ptr %call.i
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}
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; 3) Dynamic alloca markers.
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declare ptr @llvm.stacksave()
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declare void @llvm.stackrestore(ptr)
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; CHECK-LABEL: define ptr @testStack(
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; CHECK: entry:
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; CHECK-NEXT: %save = tail call ptr @llvm.stacksave.p0()
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; CHECK-NEXT: %obj = alloca i8, i8 %arg
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; CHECK-NEXT: call void @llvm.stackrestore.p0(ptr %save)
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; CHECK-NEXT: ret ptr %call.i
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; CHECK-NEXT: }
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define ptr @testStack(ptr %call.i, i8 %arg) {
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entry:
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%save = tail call ptr @llvm.stacksave()
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%obj = alloca i8, i8 %arg
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%0 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %call.i) nounwind
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call void @llvm.stackrestore(ptr %save)
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%1 = tail call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %call.i) nounwind
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ret ptr %call.i
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}
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