; RUN: opt -S -objc-arc < %s | FileCheck %s
; rdar://9503416
; Detect loop boundaries and don't move retains and releases
; across them.
declare void @use_pointer(i8*)
declare i8* @llvm.objc.retain(i8*)
declare void @llvm.objc.release(i8*)
declare void @callee()
declare void @block_callee(void ()*)
; CHECK-LABEL: define void @test0(
; CHECK: call i8* @llvm.objc.retain
; CHECK: for.body:
; CHECK-NOT: @objc
; CHECK: for.end:
; CHECK: call void @llvm.objc.release
; CHECK: }
define void @test0(i8* %digits) {
entry:
%tmp1 = call i8* @llvm.objc.retain(i8* %digits) nounwind
call void @use_pointer(i8* %digits)
br label %for.body
for.body: ; preds = %for.body, %entry
%upcDigitIndex.01 = phi i64 [ 2, %entry ], [ %inc, %for.body ]
call void @use_pointer(i8* %digits)
%inc = add i64 %upcDigitIndex.01, 1
%cmp = icmp ult i64 %inc, 12
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
call void @llvm.objc.release(i8* %digits) nounwind, !clang.imprecise_release !0
ret void
}
; CHECK-LABEL: define void @test1(
; CHECK: call i8* @llvm.objc.retain
; CHECK: for.body:
; CHECK-NOT: @objc
; CHECK: for.end:
; CHECK: void @llvm.objc.release
; CHECK: }
define void @test1(i8* %digits) {
entry:
%tmp1 = call i8* @llvm.objc.retain(i8* %digits) nounwind
br label %for.body
for.body: ; preds = %for.body, %entry
%upcDigitIndex.01 = phi i64 [ 2, %entry ], [ %inc, %for.body ]
call void @use_pointer(i8* %digits)
call void @use_pointer(i8* %digits)
%inc = add i64 %upcDigitIndex.01, 1
%cmp = icmp ult i64 %inc, 12
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
call void @llvm.objc.release(i8* %digits) nounwind, !clang.imprecise_release !0
ret void
}
; CHECK-LABEL: define void @test2(
; CHECK: call i8* @llvm.objc.retain
; CHECK: for.body:
; CHECK-NOT: @objc
; CHECK: for.end:
; CHECK: void @llvm.objc.release
; CHECK: }
define void @test2(i8* %digits) {
entry:
%tmp1 = call i8* @llvm.objc.retain(i8* %digits) nounwind
br label %for.body
for.body: ; preds = %for.body, %entry
%upcDigitIndex.01 = phi i64 [ 2, %entry ], [ %inc, %for.body ]
call void @use_pointer(i8* %digits)
%inc = add i64 %upcDigitIndex.01, 1
%cmp = icmp ult i64 %inc, 12
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
call void @use_pointer(i8* %digits)
call void @llvm.objc.release(i8* %digits) nounwind, !clang.imprecise_release !0
ret void
}
; Delete nested retain+release pairs around loops.
; CHECK: define void @test3(i8* %a) #0 {
; CHECK-NEXT: entry:
; CHECK-NEXT: tail call i8* @llvm.objc.retain(i8* %a) [[NUW:#[0-9]+]]
; CHECK-NEXT: br label %loop
; CHECK-NOT: @llvm.objc.
; CHECK: exit:
; CHECK-NEXT: call void @llvm.objc.release(i8* %a)
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test3(i8* %a) nounwind {
entry:
%outer = call i8* @llvm.objc.retain(i8* %a) nounwind
%inner = call i8* @llvm.objc.retain(i8* %a) nounwind
br label %loop
loop:
call void @callee()
store i8 0, i8* %a
br i1 undef, label %loop, label %exit
exit:
call void @llvm.objc.release(i8* %a) nounwind
call void @llvm.objc.release(i8* %a) nounwind, !clang.imprecise_release !0
ret void
}
; CHECK: define void @test4(i8* %a) #0 {
; CHECK-NEXT: entry:
; CHECK-NEXT: tail call i8* @llvm.objc.retain(i8* %a) [[NUW]]
; CHECK-NEXT: br label %loop
; CHECK-NOT: @llvm.objc.
; CHECK: exit:
; CHECK-NEXT: call void @llvm.objc.release(i8* %a)
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test4(i8* %a) nounwind {
entry:
%outer = call i8* @llvm.objc.retain(i8* %a) nounwind
%inner = call i8* @llvm.objc.retain(i8* %a) nounwind
br label %loop
loop:
br label %more
more:
call void @callee()
call void @callee()
store i8 0, i8* %a
br i1 undef, label %loop, label %exit
exit:
call void @llvm.objc.release(i8* %a) nounwind
call void @llvm.objc.release(i8* %a) nounwind, !clang.imprecise_release !0
ret void
}
; CHECK: define void @test5(i8* %a) #0 {
; CHECK-NEXT: entry:
; CHECK-NEXT: tail call i8* @llvm.objc.retain(i8* %a) [[NUW]]
; CHECK-NEXT: call void @callee()
; CHECK-NEXT: br label %loop
; CHECK-NOT: @llvm.objc.
; CHECK: exit:
; CHECK-NEXT: call void @use_pointer(i8* %a)
; CHECK-NEXT: call void @llvm.objc.release(i8* %a)
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test5(i8* %a) nounwind {
entry:
%outer = tail call i8* @llvm.objc.retain(i8* %a) nounwind
%inner = tail call i8* @llvm.objc.retain(i8* %a) nounwind
call void @callee()
br label %loop
loop:
br i1 undef, label %true, label %more
true:
br label %more
more:
br i1 undef, label %exit, label %loop
exit:
call void @use_pointer(i8* %a)
call void @llvm.objc.release(i8* %a) nounwind
call void @llvm.objc.release(i8* %a) nounwind, !clang.imprecise_release !0
ret void
}
; CHECK: define void @test6(i8* %a) #0 {
; CHECK-NEXT: entry:
; CHECK-NEXT: tail call i8* @llvm.objc.retain(i8* %a) [[NUW]]
; CHECK-NEXT: br label %loop
; CHECK-NOT: @llvm.objc.
; CHECK: exit:
; CHECK-NEXT: call void @use_pointer(i8* %a)
; CHECK-NEXT: call void @llvm.objc.release(i8* %a)
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test6(i8* %a) nounwind {
entry:
%outer = tail call i8* @llvm.objc.retain(i8* %a) nounwind
%inner = tail call i8* @llvm.objc.retain(i8* %a) nounwind
br label %loop
loop:
br i1 undef, label %true, label %more
true:
call void @callee()
br label %more
more:
br i1 undef, label %exit, label %loop
exit:
call void @use_pointer(i8* %a)
call void @llvm.objc.release(i8* %a) nounwind
call void @llvm.objc.release(i8* %a) nounwind, !clang.imprecise_release !0
ret void
}
; CHECK: define void @test7(i8* %a) #0 {
; CHECK-NEXT: entry:
; CHECK-NEXT: tail call i8* @llvm.objc.retain(i8* %a) [[NUW]]
; CHECK-NEXT: call void @callee()
; CHECK-NEXT: br label %loop
; CHECK-NOT: @llvm.objc.
; CHECK: exit:
; CHECK-NEXT: call void @llvm.objc.release(i8* %a)
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test7(i8* %a) nounwind {
entry:
%outer = tail call i8* @llvm.objc.retain(i8* %a) nounwind
%inner = tail call i8* @llvm.objc.retain(i8* %a) nounwind
call void @callee()
br label %loop
loop:
br i1 undef, label %true, label %more
true:
call void @use_pointer(i8* %a)
br label %more
more:
br i1 undef, label %exit, label %loop
exit:
call void @llvm.objc.release(i8* %a) nounwind
call void @llvm.objc.release(i8* %a) nounwind, !clang.imprecise_release !0
ret void
}
; CHECK: define void @test8(i8* %a) #0 {
; CHECK-NEXT: entry:
; CHECK-NEXT: tail call i8* @llvm.objc.retain(i8* %a) [[NUW]]
; CHECK-NEXT: br label %loop
; CHECK-NOT: @llvm.objc.
; CHECK: exit:
; CHECK-NEXT: call void @llvm.objc.release(i8* %a)
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test8(i8* %a) nounwind {
entry:
%outer = tail call i8* @llvm.objc.retain(i8* %a) nounwind
%inner = tail call i8* @llvm.objc.retain(i8* %a) nounwind
br label %loop
loop:
br i1 undef, label %true, label %more
true:
call void @callee()
call void @use_pointer(i8* %a)
br label %more
more:
br i1 undef, label %exit, label %loop
exit:
call void @llvm.objc.release(i8* %a) nounwind
call void @llvm.objc.release(i8* %a) nounwind, !clang.imprecise_release !0
ret void
}
; CHECK: define void @test9(i8* %a) #0 {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label %loop
; CHECK-NOT: @llvm.objc.
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test9(i8* %a) nounwind {
entry:
%outer = tail call i8* @llvm.objc.retain(i8* %a) nounwind
%inner = tail call i8* @llvm.objc.retain(i8* %a) nounwind
br label %loop
loop:
br i1 undef, label %true, label %more
true:
call void @use_pointer(i8* %a)
br label %more
more:
br i1 undef, label %exit, label %loop
exit:
call void @llvm.objc.release(i8* %a) nounwind
call void @llvm.objc.release(i8* %a) nounwind, !clang.imprecise_release !0
ret void
}
; CHECK: define void @test10(i8* %a) #0 {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label %loop
; CHECK-NOT: @llvm.objc.
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test10(i8* %a) nounwind {
entry:
%outer = tail call i8* @llvm.objc.retain(i8* %a) nounwind
%inner = tail call i8* @llvm.objc.retain(i8* %a) nounwind
br label %loop
loop:
br i1 undef, label %true, label %more
true:
call void @callee()
br label %more
more:
br i1 undef, label %exit, label %loop
exit:
call void @llvm.objc.release(i8* %a) nounwind
call void @llvm.objc.release(i8* %a) nounwind, !clang.imprecise_release !0
ret void
}
; CHECK: define void @test11(i8* %a) #0 {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label %loop
; CHECK-NOT: @llvm.objc.
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test11(i8* %a) nounwind {
entry:
%outer = tail call i8* @llvm.objc.retain(i8* %a) nounwind
%inner = tail call i8* @llvm.objc.retain(i8* %a) nounwind
br label %loop
loop:
br i1 undef, label %true, label %more
true:
br label %more
more:
br i1 undef, label %exit, label %loop
exit:
call void @llvm.objc.release(i8* %a) nounwind
call void @llvm.objc.release(i8* %a) nounwind, !clang.imprecise_release !0
ret void
}
; Don't delete anything if they're not balanced.
; CHECK: define void @test12(i8* %a) #0 {
; CHECK-NEXT: entry:
; CHECK-NEXT: %outer = tail call i8* @llvm.objc.retain(i8* %a) [[NUW]]
; CHECK-NEXT: %inner = tail call i8* @llvm.objc.retain(i8* %a) [[NUW]]
; CHECK-NEXT: br label %loop
; CHECK-NOT: @llvm.objc.
; CHECK: exit:
; CHECK-NEXT: call void @llvm.objc.release(i8* %a) [[NUW]]
; CHECK-NEXT: call void @llvm.objc.release(i8* %a) [[NUW]], !clang.imprecise_release !0
; CHECK-NEXT: ret void
; CHECK-NEXT: }
define void @test12(i8* %a) nounwind {
entry:
%outer = tail call i8* @llvm.objc.retain(i8* %a) nounwind
%inner = tail call i8* @llvm.objc.retain(i8* %a) nounwind
br label %loop
loop:
br i1 undef, label %true, label %more
true:
ret void
more:
br i1 undef, label %exit, label %loop
exit:
call void @llvm.objc.release(i8* %a) nounwind
call void @llvm.objc.release(i8* %a) nounwind, !clang.imprecise_release !0
ret void
}
; Do not improperly pair retains in a for loop with releases outside of a for
; loop when the proper pairing is disguised by a separate provenance represented
; by an alloca.
; rdar://12969722
; CHECK: define void @test13(i8* %a) [[NUW]] {
; CHECK: entry:
; CHECK: tail call i8* @llvm.objc.retain(i8* %a) [[NUW]]
; CHECK: loop:
; CHECK: tail call i8* @llvm.objc.retain(i8* %a) [[NUW]]
; CHECK: call void @block_callee
; CHECK: call void @llvm.objc.release(i8* %reloaded_a) [[NUW]]
; CHECK: exit:
; CHECK: call void @llvm.objc.release(i8* %a) [[NUW]]
; CHECK: }
define void @test13(i8* %a) nounwind {
entry:
%block = alloca i8*
%a1 = tail call i8* @llvm.objc.retain(i8* %a) nounwind
br label %loop
loop:
%a2 = tail call i8* @llvm.objc.retain(i8* %a) nounwind
store i8* %a, i8** %block, align 8
%casted_block = bitcast i8** %block to void ()*
call void @block_callee(void ()* %casted_block)
%reloaded_a = load i8*, i8** %block, align 8
call void @llvm.objc.release(i8* %reloaded_a) nounwind, !clang.imprecise_release !0
br i1 undef, label %loop, label %exit
exit:
call void @llvm.objc.release(i8* %a) nounwind, !clang.imprecise_release !0
ret void
}
; The retain call in the entry block shouldn't be moved to the loop body.
; CHECK: define void @test14(i8* %[[VAL0:.*]],
; CHECK: %[[V1:.*]] = tail call i8* @llvm.objc.retain(i8* %[[VAL0]])
; CHECK: %[[CMP:.*]] = icmp eq i8* %[[VAL0]], null
; CHECK: br i1 %[[CMP]], label %{{.*}}, label %{{.*}}
define void @test14(i8* %val0, i8 %val1) {
entry:
%v1 = tail call i8* @llvm.objc.retain(i8* %val0)
%cmp = icmp eq i8* %val0, null
br i1 %cmp, label %if.end27, label %if.then
if.then:
%tobool = icmp eq i8 %val1, 1
br label %for.body
for.cond:
%cmp6 = icmp eq i8 %val1, 2
br i1 %cmp6, label %for.body, label %for.end.loopexit
for.body:
call void @callee()
%tobool9 = icmp eq i8 %val1, 0
br i1 %tobool9, label %for.cond, label %if.then10
if.then10:
br label %for.end
for.end.loopexit:
br label %for.end
for.end:
call void @callee()
call void @use_pointer(i8* %v1)
br label %if.end27
if.end27:
call void @llvm.objc.release(i8* %v1) #0, !clang.imprecise_release !0
ret void
}
; CHECK: attributes [[NUW]] = { nounwind }
!0 = !{}