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Don't convert objc_retainAutoreleasedReturnValue to objc_retain if it

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is retaining the return value of an invoke that it immediately follows.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153344 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2012-03-23 18:09:00 +00:00
parent fbab4a8c8a
commit 6fedb3c401
3 changed files with 55 additions and 3 deletions
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13
lib/Transforms/Scalar/ObjCARC.cpp
View File

@ -2143,17 +2143,26 @@ ObjCARCOpt::OptimizeRetainCall(Function &F, Instruction *Retain) {
/// return true.
bool
ObjCARCOpt::OptimizeRetainRVCall(Function &F, Instruction *RetainRV) {
// Check for the argument being from an immediately preceding call.
// Check for the argument being from an immediately preceding call or invoke.
Value *Arg = GetObjCArg(RetainRV);
CallSite CS(Arg);
if (Instruction *Call = CS.getInstruction())
if (Instruction *Call = CS.getInstruction()) {
if (Call->getParent() == RetainRV->getParent()) {
BasicBlock::iterator I = Call;
++I;
while (isNoopInstruction(I)) ++I;
if (&*I == RetainRV)
return false;
} else if (InvokeInst *II = dyn_cast<InvokeInst>(Call)) {
BasicBlock *RetainRVParent = RetainRV->getParent();
if (II->getNormalDest() == RetainRVParent) {
BasicBlock::iterator I = RetainRVParent->begin();
while (isNoopInstruction(I)) ++I;
if (&*I == RetainRV)
return false;
}
}
}
// Check for being preceded by an objc_autoreleaseReturnValue on the same
// pointer. In this case, we can delete the pair.

43
test/Transforms/ObjCARC/invoke.ll
View File

@ -6,6 +6,7 @@ declare i8* @objc_retainAutoreleasedReturnValue(i8*)
declare i8* @objc_msgSend(i8*, i8*, ...)
declare void @use_pointer(i8*)
declare void @callee()
declare i8* @returner()
; ARCOpt shouldn't try to move the releases to the block containing the invoke.
@ -169,6 +170,48 @@ if.end:
ret void
}
; Don't turn the retainAutoreleaseReturnValue into retain, because it's
; for an invoke which we can assume codegen will put immediately prior.
; CHECK: define void @test5(
; CHECK: call i8* @objc_retainAutoreleasedReturnValue(i8* %z)
; CHECK: }
define void @test5() {
entry:
%z = invoke i8* @returner()
to label %if.end unwind label %lpad, !clang.arc.no_objc_arc_exceptions !0
lpad:
%r13 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__objc_personality_v0 to i8*)
cleanup
ret void
if.end:
call i8* @objc_retainAutoreleasedReturnValue(i8* %z)
ret void
}
; Like test5, but there's intervening code.
; CHECK: define void @test6(
; CHECK: call i8* @objc_retain(i8* %z)
; CHECK: }
define void @test6() {
entry:
%z = invoke i8* @returner()
to label %if.end unwind label %lpad, !clang.arc.no_objc_arc_exceptions !0
lpad:
%r13 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__objc_personality_v0 to i8*)
cleanup
ret void
if.end:
call void @callee()
call i8* @objc_retainAutoreleasedReturnValue(i8* %z)
ret void
}
declare i32 @__gxx_personality_v0(...)
declare i32 @__objc_personality_v0(...)

2
test/Transforms/ObjCARC/retain-not-declared.ll
View File

@ -30,7 +30,7 @@ entry:
; CHECK: @test1(
; CHECK: @objc_retain(
; CHECK: @objc_retain(
; CHECK: @objc_retainAutoreleasedReturnValue(
; CHECK: @objc_release(
; CHECK: @objc_release(
; CHECK: }