234 lines
6.7 KiB
LLVM
234 lines
6.7 KiB
LLVM
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; RUN: opt -objc-arc-contract -S < %s | FileCheck %s
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; RUN: opt -passes=objc-arc-contract -S < %s | FileCheck %s
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target datalayout = "e-p:64:64:64"
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declare i8* @llvm.objc.retain(i8*)
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declare void @llvm.objc.release(i8*)
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declare i8* @llvm.objc.autorelease(i8*)
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declare i8* @llvm.objc.autoreleaseReturnValue(i8*)
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declare i8* @llvm.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-LABEL: 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* @llvm.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-LABEL: 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* @llvm.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-LABEL: define void @test2(
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; CHECK: tail call i8* @llvm.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* @llvm.objc.retain(i8* %x) nounwind
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call i8* @llvm.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-LABEL: define i8* @test2b(
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; CHECK: tail call i8* @llvm.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* @llvm.objc.retain(i8* %x) nounwind
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tail call i8* @llvm.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-LABEL: define void @test3(
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; CHECK: tail call i8* @llvm.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* @llvm.objc.retain(i8* %x) nounwind
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call void @use_pointer(i8* %x)
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call i8* @llvm.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-LABEL: define void @test4(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: @llvm.objc.retainAutorelease(i8* %x) [[NUW]]
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; CHECK-NEXT: @use_pointer
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; CHECK-NEXT: @llvm.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* @llvm.objc.retain(i8* %x) nounwind
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call void @use_pointer(i8* %x)
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call i8* @llvm.objc.autorelease(i8* %x) nounwind
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tail call void @llvm.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-LABEL: define void @test5(
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; CHECK: tail call i8* @llvm.objc.retain(i8* %p) [[NUW]]
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; CHECK: true:
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; CHECK: call i8* @llvm.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* @llvm.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* @llvm.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-LABEL: define i8* @test6(
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; CHECK: call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %p) [[NUW]]
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; CHECK: %t = tail call i8* @llvm.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* @llvm.objc.retainAutoreleasedReturnValue(i8* %p) nounwind
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%t = tail call i8* @llvm.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* @llvm.objc.retain(i8* %p)
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; CHECK: call void @use_pointer(i8* %1)
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; CHECK: tail call i8* @llvm.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* @llvm.objc.retain(i8* %p)
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call void @use_pointer(i8* %p)
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%2 = tail call i8* @llvm.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-LABEL: 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* @llvm.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 @llvm.objc.clang.arc.use(...)
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; CHECK-LABEL: 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 (...) @llvm.objc.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* @llvm.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* @llvm.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-LABEL: define void @test11(
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; CHECK-NEXT: %y = call i8* @returner()
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; CHECK-NEXT: tail call i8* @llvm.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* @llvm.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-LABEL: define void @test12(
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; CHECK-NEXT: tail call i8* @llvm.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* @llvm.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-LABEL: 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* @llvm.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* @llvm.objc.retain(i8* %y) nounwind
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ret void
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}
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declare void @llvm.objc.clang.arc.use(...) nounwind
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; CHECK: attributes [[NUW]] = { nounwind }
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