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llvm-project/llvm/lib/Transforms/ObjCARC
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Akira Hatanaka 5c3117b0a9 [ObjC][ARC] Check the basic block size before calling 
DominatorTree::dominate.

ARC contract pass has an optimization that replaces the uses of the
argument of an ObjC runtime function call with the call result.

For example:

; Before optimization
%1 = tail call i8* @foo1()
%2 = tail call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %1)
store i8* %1, i8** @g0, align 8

; After optimization
%1 = tail call i8* @foo1()
%2 = tail call i8* @llvm.objc.retainAutoreleasedReturnValue(i8* %1)
store i8* %2, i8** @g0, align 8 // %1 is replaced with %2

Before replacing the argument use, DominatorTree::dominate is called to
determine whether the user instruction is dominated by the ObjC runtime
function call instruction. The call to DominatorTree::dominate can be
expensive if the two instructions belong to the same basic block and the
size of the basic block is large. This patch checks the basic block size
and just bails out if the size exceeds the limit set by command line
option "arc-contract-max-bb-size".

rdar://problem/49477063

Differential Revision: https://reviews.llvm.org/D60900

llvm-svn: 359027
 		2019-04-23 19:49:03 +00:00
..
ARCRuntimeEntryPoints.h [opaque pointer types] Pass function types to CallInst creation. 2019-02-01 20:43:25 +00:00
BlotMapVector.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
CMakeLists.txt
…
DependencyAnalysis.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
DependencyAnalysis.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
LLVMBuild.txt Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ObjCARC.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ObjCARC.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ObjCARCAPElim.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ObjCARCContract.cpp [ObjC][ARC] Check the basic block size before calling 2019-04-23 19:49:03 +00:00
ObjCARCExpand.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ObjCARCOpts.cpp Don't add a tail keyword to calls to ObjC runtime functions if the calls 2019-03-21 20:16:09 +00:00
ProvenanceAnalysis.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ProvenanceAnalysis.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ProvenanceAnalysisEvaluator.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
PtrState.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
PtrState.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00