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Non optimizable objc_retainBlock calls are not forwarding.

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Since we handle optimizable objc_retainBlocks through strength reduction
in OptimizableIndividualCalls, we know that all code after that point
will only see non-optimizable objc_retainBlock calls. IsForwarding is
only called by functions after that point, so it is ok to just classify
objc_retainBlock as non-forwarding.

<rdar://problem/13249661>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178285 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Gottesman 2013-03-28 20:11:30 +00:00
parent 0d92a3c600
commit 3832eff354
2 changed files with 2 additions and 5 deletions
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3
lib/Transforms/ObjCARC/ObjCARC.h
View File

@ -120,13 +120,10 @@ static inline bool IsAutorelease(InstructionClass Class) {
/// \brief Test if the given class represents instructions which return their
/// argument verbatim.
static inline bool IsForwarding(InstructionClass Class) {
// objc_retainBlock technically doesn't always return its argument
// verbatim, but it doesn't matter for our purposes here.
return Class == IC_Retain ||
Class == IC_RetainRV ||
Class == IC_Autorelease ||
Class == IC_AutoreleaseRV ||
Class == IC_RetainBlock ||
Class == IC_NoopCast;
}

4
test/Transforms/ObjCARC/retain-block.ll
View File

@ -98,7 +98,7 @@ entry:
; CHECK-NEXT: tail call i8* @objc_retainBlock(i8* %tmp) [[NUW]]
; CHECK-NEXT: @use_pointer(i8* %tmp2)
; CHECK-NEXT: @use_pointer(i8* %tmp2)
; CHECK-NEXT: tail call void @objc_release(i8* %tmp) [[NUW]], !clang.imprecise_release !0
; CHECK-NEXT: tail call void @objc_release(i8* %tmp2) [[NUW]], !clang.imprecise_release !0
; CHECK-NOT: @objc
; CHECK: }
define void @test1_no_metadata(i8* %tmp) {
@ -122,7 +122,7 @@ entry:
; CHECK-NEXT: store i8* %tmp2, i8** %z
; CHECK-NEXT: @use_pointer(i8* %tmp2)
; CHECK-NEXT: @use_pointer(i8* %tmp2)
; CHECK-NEXT: tail call void @objc_release(i8* %tmp) [[NUW]], !clang.imprecise_release !0
; CHECK-NEXT: tail call void @objc_release(i8* %tmp2) [[NUW]], !clang.imprecise_release !0
; CHECK-NOT: @objc
; CHECK: }
define void @test1_escape(i8* %tmp, i8** %z) {