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; RUN: opt -S -passes=objc-arc < %s | FileCheck %s
declare void @use_pointer(ptr)
declare ptr @returner()
declare ptr @llvm.objc.retain(ptr)
declare ptr @llvm.objc.autoreleaseReturnValue(ptr)
declare ptr @llvm.objc.retainAutoreleasedReturnValue(ptr)
; Clean up residue left behind after inlining.
; CHECK-LABEL: define void @test0(
; CHECK: entry:
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test0(ptr %call.i) {
entry:
%0 = tail call ptr @llvm.objc.retain(ptr %call.i) nounwind
%1 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %0) nounwind
ret void
}
; Same as test0, but with slightly different use arrangements.
; CHECK-LABEL: define void @test1(
; CHECK: entry:
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test1(ptr %call.i) {
entry:
%0 = tail call ptr @llvm.objc.retain(ptr %call.i) nounwind
%1 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %call.i) nounwind
ret void
}
; Delete a retainRV+autoreleaseRV even if the pointer is used.
; CHECK-LABEL: define void @test24(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @use_pointer(ptr %p)
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test24(ptr %p) {
entry:
call ptr @llvm.objc.autoreleaseReturnValue(ptr %p) nounwind
call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %p) nounwind
call void @use_pointer(ptr %p)
ret void
}
; Check that we can delete the autoreleaseRV+retainAutoreleasedRV pair even in
; presence of instructions added by the inliner as part of the return sequence.
; 1) Noop instructions: bitcasts and zero-indices GEPs.
; CHECK-LABEL: define ptr @testNoop(
; CHECK: entry:
; CHECK-NEXT: ret ptr %call.i
; CHECK-NEXT: }
define ptr @testNoop(ptr %call.i) {
entry:
%0 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %call.i) nounwind
%1 = tail call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %call.i) nounwind
ret ptr %call.i
}
; 2) Lifetime markers.
declare void @llvm.lifetime.start.p0(i64, ptr)
declare void @llvm.lifetime.end.p0(i64, ptr)
; CHECK-LABEL: define ptr @testLifetime(
; CHECK: entry:
; CHECK-NEXT: %obj = alloca i8
; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 8, ptr %obj)
; CHECK-NEXT: call void @llvm.lifetime.end.p0(i64 8, ptr %obj)
; CHECK-NEXT: ret ptr %call.i
; CHECK-NEXT: }
define ptr @testLifetime(ptr %call.i) {
entry:
%obj = alloca i8
call void @llvm.lifetime.start.p0(i64 8, ptr %obj)
%0 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %call.i) nounwind
call void @llvm.lifetime.end.p0(i64 8, ptr %obj)
%1 = tail call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %call.i) nounwind
ret ptr %call.i
}
; 3) Dynamic alloca markers.
declare ptr @llvm.stacksave()
declare void @llvm.stackrestore(ptr)
; CHECK-LABEL: define ptr @testStack(
; CHECK: entry:
; CHECK-NEXT: %save = tail call ptr @llvm.stacksave.p0()
; CHECK-NEXT: %obj = alloca i8, i8 %arg
; CHECK-NEXT: call void @llvm.stackrestore.p0(ptr %save)
; CHECK-NEXT: ret ptr %call.i
; CHECK-NEXT: }
define ptr @testStack(ptr %call.i, i8 %arg) {
entry:
%save = tail call ptr @llvm.stacksave()
%obj = alloca i8, i8 %arg
%0 = tail call ptr @llvm.objc.autoreleaseReturnValue(ptr %call.i) nounwind
call void @llvm.stackrestore(ptr %save)
%1 = tail call ptr @llvm.objc.retainAutoreleasedReturnValue(ptr %call.i) nounwind
ret ptr %call.i
}
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