Akira Hatanaka a30499dbf2 [ObjC][ARC] Don't remove autoreleaseRV/retainRV pairs if the call isn't ... a tail call This reapplies the patch in https://reviews.llvm.org/rG1f5b471b8bf4, which was reverted because it was causing crashes. https://bugs.chromium.org/p/chromium/issues/detail?id=1061289#c2 Check that HasSafePathToCall is true before checking the call is a tail call. Original commit message: Previosly ARC optimizer removed the autoreleaseRV/retainRV pair in the following code, which caused the object returned by @something to be placed in the autorelease pool because the call to @something isn't a tail call: ``` %call = call i8* @something(...) %2 = call i8* @objc_retainAutoreleasedReturnValue(i8* %call) %3 = call i8* @objc_autoreleaseReturnValue(i8* %2) ret i8* %3 ``` Fix the bug by checking whether @something is a tail call. rdar://problem/59275894		2020-03-13 13:52:14 -07:00
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AggressiveInstCombine	[ConstantFolding] Always return something from ConstantFoldConstant	2020-03-04 18:24:47 +01:00
CFGuard	Add missing newlines at EOF; NFC	2020-02-12 15:57:25 +00:00
Coroutines	[Coroutines] Optimized coroutine elision based on reachability	2020-03-05 14:43:50 +08:00
Hello
InstCombine	[SVE] Update API ConstantVector::getSplat() to use ElementCount.	2020-03-12 13:22:41 -07:00
Instrumentation	Reland: [Coverage] Revise format to reduce binary size	2020-02-28 18:12:04 -08:00
IPO	[Attributor] Detect possibly unbounded cycles in functions	2020-03-13 11:17:33 -05:00
ObjCARC	[ObjC][ARC] Don't remove autoreleaseRV/retainRV pairs if the call isn't	2020-03-13 13:52:14 -07:00
Scalar	[LoopInterchange] Fix interchanging contents of preheader BBs	2020-03-13 15:59:37 -04:00
Utils	[SimplifyCFG] fix formatting; NFC	2020-03-13 14:12:28 -04:00
Vectorize	[SLPVectorizer][SVE] Bail out early for scalable vector.	2020-03-13 11:23:31 -07:00
CMakeLists.txt	Add Windows Control Flow Guard checks (/guard:cf).	2019-10-28 15:19:39 +00:00
LLVMBuild.txt	Add Windows Control Flow Guard checks (/guard:cf).	2019-10-28 15:19:39 +00:00