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llvm-mirror/lib/Transforms/Utils
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Davide Italiano 3672dcbb24 [SimplifyLibCalls] Correctly set the is_zero_undef flag for llvm.cttz 
If <src> is non-zero we can safely set the flag to true, and this
results in less code generated for, e.g. ffs(x) + 1 on FreeBSD.
Thanks to majnemer for suggesting the fix and reviewing.

Code generated before the patch was applied:


 0:   0f bc c7                bsf    %edi,%eax
 3:   b9 20 00 00 00          mov    $0x20,%ecx
 8:   0f 45 c8                cmovne %eax,%ecx
 b:   83 c1 02                add    $0x2,%ecx
 e:   b8 01 00 00 00          mov    $0x1,%eax
13:   85 ff                   test   %edi,%edi
15:   0f 45 c1                cmovne %ecx,%eax
18:   c3                      retq

Code generated after the patch was applied:

 0:   0f bc cf                bsf    %edi,%ecx
 3:   83 c1 02                add    $0x2,%ecx
 6:   85 ff                   test   %edi,%edi
 8:   b8 01 00 00 00          mov    $0x1,%eax
 d:   0f 45 c1                cmovne %ecx,%eax
10:   c3                      retq

It seems we can still use cmove and save another 'test' instruction, but
that can be tackled separately.

Differential Revision:  http://reviews.llvm.org/D11989	

llvm-svn: 244947
2015-08-13 20:34:26 +00:00
..
AddDiscriminators.cpp IR: Give 'DI' prefix to debug info metadata 2015-04-29 16:38:44 +00:00
ASanStackFrameLayout.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
BasicBlockUtils.cpp Convert a bunch of loops to foreach. NFC. 2015-08-06 20:22:46 +00:00
BreakCriticalEdges.cpp Drive-by fixes for LandingPad -> EHPad 2015-08-04 08:21:40 +00:00
BuildLibCalls.cpp Simplify IRBuilder::CreateCall* by using ArrayRef+initializer_list/braced init only 2015-05-18 22:13:54 +00:00
BypassSlowDivision.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
CloneFunction.cpp Fix some comment typos. 2015-08-08 18:27:36 +00:00
CloneModule.cpp [Cloning] Teach CloneModule about personality functions 2015-06-30 22:14:01 +00:00
CMakeLists.txt [LoopDist/LoopVer] Move LoopVersioning to a new module, NFC 2015-07-10 18:55:13 +00:00
CmpInstAnalysis.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
CodeExtractor.cpp Drive-by fixes for LandingPad -> EHPad 2015-08-04 08:21:40 +00:00
CtorUtils.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
DemoteRegToStack.cpp [WinEHPrepare] Add rudimentary support for the new EH instructions 2015-08-11 01:15:26 +00:00
FlattenCFG.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
GlobalStatus.cpp [CallSite] Make construction from Value* (or Instruction*) explicit. 2015-04-10 14:50:08 +00:00
InlineFunction.cpp New EH representation for MSVC compatibility 2015-07-31 17:58:14 +00:00
InstructionNamer.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
IntegerDivision.cpp Simplify IRBuilder::CreateCall* by using ArrayRef+initializer_list/braced init only 2015-05-18 22:13:54 +00:00
LCSSA.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
LLVMBuild.txt Update libdeps since TLI was moved from Target to Analysis in r226078. 2015-01-15 05:21:00 +00:00
Local.cpp [ConstantFoldTerminator] Preserve make.implicit metadata when converting SwitchInst to BranchInst 2015-08-07 19:30:12 +00:00
LoopSimplify.cpp Drive-by fixes for LandingPad -> EHPad 2015-08-04 08:21:40 +00:00
LoopUnroll.cpp [PM/AA] Remove all of the dead AliasAnalysis pointers being threaded 2015-07-22 09:52:54 +00:00
LoopUnrollRuntime.cpp [PM/AA] Remove all of the dead AliasAnalysis pointers being threaded 2015-07-22 09:52:54 +00:00
LoopUtils.cpp Late evaluation of the fast-math vectorization requirement. 2015-08-10 19:51:46 +00:00
LoopVersioning.cpp [LoopVer] Optionally allow using memchecks from LAA 2015-08-12 16:51:19 +00:00
LowerInvoke.cpp [Modules] Fix potential ODR violations by sinking the DEBUG_TYPE 2014-04-22 02:55:47 +00:00
LowerSwitch.cpp [LowerSwitch] Skip dead blocks for processSwitchInst() 2015-08-11 20:16:17 +00:00
Makefile
Mem2Reg.cpp [PM] Split the AssumptionTracker immutable pass into two separate APIs: 2015-01-04 12:03:27 +00:00
MetaRenamer.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
ModuleUtils.cpp [asan] Rename the ABI versioning symbol to '__asan_version_mismatch_check' instead of abusing '__asan_init' 2015-07-23 10:54:06 +00:00
PromoteMemoryToRegister.cpp Fix mem2reg to correctly handle allocas only used in a single block 2015-07-22 10:29:29 +00:00
SimplifyCFG.cpp Convert a bunch of loops to foreach. NFC. 2015-08-06 20:22:46 +00:00
SimplifyIndVar.cpp Fix some comment typos. 2015-08-08 18:27:36 +00:00
SimplifyInstructions.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
SimplifyLibCalls.cpp [SimplifyLibCalls] Correctly set the is_zero_undef flag for llvm.cttz 2015-08-13 20:34:26 +00:00
SSAUpdater.cpp Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC) 2015-06-23 09:49:53 +00:00
SymbolRewriter.cpp Remove unnecessary includes 2015-08-08 00:41:53 +00:00
UnifyFunctionExitNodes.cpp [LPM] Stop using the string based preservation API. It is an 2015-01-28 04:57:56 +00:00
Utils.cpp Pass to emit DWARF path discriminators. 2014-03-03 20:06:11 +00:00
ValueMapper.cpp ValueMapper: Resolve uniquing cycles more aggressively 2015-08-07 00:44:55 +00:00