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Turning retains into retainRV calls disrupts the data flow analysis in ObjCARCOpts. Thus we move it as late as we can by moving it into ObjCARCContract. We leave in the conversion from retainRV -> retain in ObjCARCOpt since it enables the dataflow analysis. rdar://10813093 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180698 91177308-0d34-0410-b5e6-96231b3b80d8
233 lines
6.4 KiB
LLVM
233 lines
6.4 KiB
LLVM
; RUN: opt -objc-arc-contract -S < %s | FileCheck %s
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target datalayout = "e-p:64:64:64"
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declare i8* @objc_retain(i8*)
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declare void @objc_release(i8*)
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declare i8* @objc_autorelease(i8*)
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declare i8* @objc_autoreleaseReturnValue(i8*)
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declare i8* @objc_retainAutoreleasedReturnValue(i8*)
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declare void @use_pointer(i8*)
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declare i8* @returner()
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declare void @callee()
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; CHECK: define void @test0
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; CHECK: call void @use_pointer(i8* %0)
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; CHECK: }
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define void @test0(i8* %x) nounwind {
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entry:
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%0 = call i8* @objc_retain(i8* %x) nounwind
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call void @use_pointer(i8* %x)
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ret void
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}
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; CHECK: define void @test1
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; CHECK: call void @use_pointer(i8* %0)
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; CHECK: }
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define void @test1(i8* %x) nounwind {
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entry:
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%0 = call i8* @objc_autorelease(i8* %x) nounwind
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call void @use_pointer(i8* %x)
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ret void
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}
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; Merge objc_retain and objc_autorelease into objc_retainAutorelease.
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; CHECK: define void @test2(
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; CHECK: tail call i8* @objc_retainAutorelease(i8* %x) [[NUW:#[0-9]+]]
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; CHECK: }
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define void @test2(i8* %x) nounwind {
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entry:
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%0 = tail call i8* @objc_retain(i8* %x) nounwind
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call i8* @objc_autorelease(i8* %0) nounwind
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call void @use_pointer(i8* %x)
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ret void
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}
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; Same as test2 but the value is returned. Do an RV optimization.
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; CHECK: define i8* @test2b(
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; CHECK: tail call i8* @objc_retainAutoreleaseReturnValue(i8* %x) [[NUW]]
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; CHECK: }
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define i8* @test2b(i8* %x) nounwind {
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entry:
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%0 = tail call i8* @objc_retain(i8* %x) nounwind
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tail call i8* @objc_autoreleaseReturnValue(i8* %0) nounwind
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ret i8* %x
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}
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; Merge a retain,autorelease pair around a call.
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; CHECK: define void @test3(
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; CHECK: tail call i8* @objc_retainAutorelease(i8* %x) [[NUW]]
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; CHECK: @use_pointer(i8* %0)
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; CHECK: }
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define void @test3(i8* %x, i64 %n) {
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entry:
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tail call i8* @objc_retain(i8* %x) nounwind
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call void @use_pointer(i8* %x)
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call i8* @objc_autorelease(i8* %x) nounwind
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ret void
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}
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; Trivial retain,autorelease pair with intervening call, but it's post-dominated
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; by another release. The retain and autorelease can be merged.
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; CHECK: define void @test4(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: @objc_retainAutorelease(i8* %x) [[NUW]]
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; CHECK-NEXT: @use_pointer
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; CHECK-NEXT: @objc_release
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test4(i8* %x, i64 %n) {
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entry:
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tail call i8* @objc_retain(i8* %x) nounwind
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call void @use_pointer(i8* %x)
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call i8* @objc_autorelease(i8* %x) nounwind
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tail call void @objc_release(i8* %x) nounwind
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ret void
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}
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; Don't merge retain and autorelease if they're not control-equivalent.
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; CHECK: define void @test5(
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; CHECK: tail call i8* @objc_retain(i8* %p) [[NUW]]
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; CHECK: true:
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; CHECK: call i8* @objc_autorelease(i8* %0) [[NUW]]
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; CHECK: }
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define void @test5(i8* %p, i1 %a) {
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entry:
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tail call i8* @objc_retain(i8* %p) nounwind
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br i1 %a, label %true, label %false
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true:
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call i8* @objc_autorelease(i8* %p) nounwind
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call void @use_pointer(i8* %p)
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ret void
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false:
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ret void
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}
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; Don't eliminate objc_retainAutoreleasedReturnValue by merging it into
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; an objc_autorelease.
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; TODO? Merge objc_retainAutoreleasedReturnValue and objc_autorelease into
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; objc_retainAutoreleasedReturnValueAutorelease and merge
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; objc_retainAutoreleasedReturnValue and objc_autoreleaseReturnValue
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; into objc_retainAutoreleasedReturnValueAutoreleaseReturnValue?
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; Those entrypoints don't exist yet though.
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; CHECK: define i8* @test6(
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; CHECK: call i8* @objc_retainAutoreleasedReturnValue(i8* %p) [[NUW]]
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; CHECK: %t = tail call i8* @objc_autoreleaseReturnValue(i8* %1) [[NUW]]
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; CHECK: }
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define i8* @test6() {
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%p = call i8* @returner()
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tail call i8* @objc_retainAutoreleasedReturnValue(i8* %p) nounwind
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%t = tail call i8* @objc_autoreleaseReturnValue(i8* %p) nounwind
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call void @use_pointer(i8* %t)
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ret i8* %t
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}
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; Don't spoil the RV optimization.
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; CHECK: define i8* @test7(i8* %p)
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; CHECK: tail call i8* @objc_retain(i8* %p)
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; CHECK: call void @use_pointer(i8* %1)
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; CHECK: tail call i8* @objc_autoreleaseReturnValue(i8* %1)
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; CHECK: ret i8* %2
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; CHECK-NEXT: }
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define i8* @test7(i8* %p) {
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%1 = tail call i8* @objc_retain(i8* %p)
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call void @use_pointer(i8* %p)
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%2 = tail call i8* @objc_autoreleaseReturnValue(i8* %p)
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ret i8* %p
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}
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; Do the return value substitution for PHI nodes too.
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; CHECK: define i8* @test8(
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; CHECK: %retval = phi i8* [ %p, %if.then ], [ null, %entry ]
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; CHECK: }
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define i8* @test8(i1 %x, i8* %c) {
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entry:
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br i1 %x, label %return, label %if.then
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if.then: ; preds = %entry
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%p = call i8* @objc_retain(i8* %c) nounwind
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br label %return
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return: ; preds = %if.then, %entry
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%retval = phi i8* [ %c, %if.then ], [ null, %entry ]
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ret i8* %retval
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}
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; Kill calls to @clang.arc.use(...)
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; CHECK: define void @test9(
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; CHECK-NOT: clang.arc.use
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; CHECK: }
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define void @test9(i8* %a, i8* %b) {
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call void (...)* @clang.arc.use(i8* %a, i8* %b) nounwind
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ret void
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}
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; Turn objc_retain into objc_retainAutoreleasedReturnValue if its operand
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; is a return value.
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; CHECK: define void @test10()
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; CHECK: tail call i8* @objc_retainAutoreleasedReturnValue(i8* %p)
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define void @test10() {
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%p = call i8* @returner()
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tail call i8* @objc_retain(i8* %p) nounwind
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ret void
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}
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; Convert objc_retain to objc_retainAutoreleasedReturnValue if its
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; argument is a return value.
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; CHECK: define void @test11(
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; CHECK-NEXT: %y = call i8* @returner()
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; CHECK-NEXT: tail call i8* @objc_retainAutoreleasedReturnValue(i8* %y) [[NUW]]
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; CHECK-NEXT: ret void
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define void @test11() {
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%y = call i8* @returner()
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tail call i8* @objc_retain(i8* %y) nounwind
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ret void
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}
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; Don't convert objc_retain to objc_retainAutoreleasedReturnValue if its
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; argument is not a return value.
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; CHECK: define void @test12(
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; CHECK-NEXT: tail call i8* @objc_retain(i8* %y) [[NUW]]
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test12(i8* %y) {
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tail call i8* @objc_retain(i8* %y) nounwind
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ret void
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}
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; Don't Convert objc_retain to objc_retainAutoreleasedReturnValue if it
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; isn't next to the call providing its return value.
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; CHECK: define void @test13(
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; CHECK-NEXT: %y = call i8* @returner()
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; CHECK-NEXT: call void @callee()
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; CHECK-NEXT: tail call i8* @objc_retain(i8* %y) [[NUW]]
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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define void @test13() {
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%y = call i8* @returner()
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call void @callee()
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tail call i8* @objc_retain(i8* %y) nounwind
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ret void
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}
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declare void @clang.arc.use(...) nounwind
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; CHECK: attributes [[NUW]] = { nounwind }
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