maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/lib/Transforms/Utils
History
Meador Inge 20255ef24d LibCallSimplifier: optimize speed for short-lived instances 
Nadav reported a performance regression due to the work I did to
merge the library call simplifier into instcombine [1].  The issue
is that a new LibCallSimplifier object is being created whenever
InstCombiner::runOnFunction is called.  Every time a LibCallSimplifier
object is used to optimize a call it creates a hash table to map from
a function name to an object that optimizes functions of that name.
For short-lived LibCallSimplifier instances this is quite inefficient.
Especially for cases where no calls are actually simplified.

This patch fixes the issue by dropping the hash table and implementing
an explicit lookup function to correlate the function name to the object
that optimizes functions of that name.  This avoids the cost of always
building and destroying the hash table in cases where the LibCallSimplifier
object is short-lived and avoids the cost of building the table when no
simplifications are actually preformed.

On a benchmark containing 100,000 calls where none of them are simplified
I noticed a 30% speedup.  On a benchmark containing 100,000 calls where
all of them are simplified I noticed an 8% speedup.

[1] http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130304/167639.html

llvm-svn: 176840
 		2013-03-12 00:08:29 +00:00
..
BasicBlockUtils.cpp Remove trailing spaces. 2013-01-14 23:16:36 +00:00
BreakCriticalEdges.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
BuildLibCalls.cpp Convert BuildLibCalls.cpp to using the AttributeSet methods instead of AttributeWithIndex. 2013-01-26 00:03:11 +00:00
BypassSlowDivision.cpp Bypass Slow Divides 2013-03-04 18:13:57 +00:00
CMakeLists.txt Sink the AddressingModeMatcher helper class into an anonymous namespace 2013-01-05 02:09:22 +00:00
CloneFunction.cpp Fixed a crash when cloning a function into a function with 2013-03-07 16:46:43 +00:00
CloneModule.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
CmpInstAnalysis.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
CodeExtractor.cpp Remove #includes from the commonly used LoopInfo.h. 2013-02-09 01:04:28 +00:00
DemoteRegToStack.cpp [SjLj Prepare] When demoting an invoke instructions to the stack, if the normal 2013-02-05 18:23:10 +00:00
InlineFunction.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
InstructionNamer.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
IntegerDivision.cpp Enhance integer division emulation support to handle types smaller than 32 bits, 2013-02-26 23:33:20 +00:00
LCSSA.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
LLVMBuild.txt LLVMBuild: Remove trailing newline, which irked me. 2011-12-12 19:48:00 +00:00
Local.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
LoopSimplify.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
LoopUnroll.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
LoopUnrollRuntime.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
LowerExpectIntrinsic.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
LowerInvoke.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
LowerSwitch.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
Makefile
…
Mem2Reg.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
MetaRenamer.cpp Make sure metarenamer won't rename special stuff (intrinsics and explicitly renamed stuff). 2013-01-23 15:03:08 +00:00
ModuleUtils.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
PromoteMemoryToRegister.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
SSAUpdater.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
SimplifyCFG.cpp Don't remove a landing pad if the invoke requires a table entry. 2013-03-11 20:53:00 +00:00
SimplifyIndVar.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
SimplifyInstructions.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
SimplifyLibCalls.cpp LibCallSimplifier: optimize speed for short-lived instances 2013-03-12 00:08:29 +00:00
UnifyFunctionExitNodes.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
Utils.cpp Add a pass that renames everything with metasyntatic names. This works well after using bugpoint to reduce the confusion presented by the original names, which no longer mean what they used to. 2012-09-11 02:46:18 +00:00
ValueMapper.cpp Linker: correctly link in dbg.declare 2013-01-31 21:19:18 +00:00