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llvm-mirror/lib
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David Bolvansky 44990dcd5e [InstCombine] Fold select with ctlz to cttz 
Summary:
Handle pattern [0]:

int ctz(unsigned int a)
{
  int c = __clz(a & -a);
  return a ? 31 - c : c;
}

In reality, the compiler can generate much better code for cttz, so fold away this pattern.

https://godbolt.org/z/c5kPtV

 [0] https://community.arm.com/community-help/f/discussions/2114/count-trailing-zeros

Reviewers: spatel, nikic, lebedev.ri, dmgreen, hfinkel

Reviewed By: hfinkel

Subscribers: hfinkel, javed.absar, kristof.beyls, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66308

llvm-svn: 370037
2019-08-27 10:22:40 +00:00
..
Analysis
[NFC] Replace the FIXME I added in rL369989 with a comment clarifying the current code
2019-08-27 04:52:35 +00:00
AsmParser
[llvm] Migrate llvm::make_unique to std::make_unique
2019-08-15 15:54:37 +00:00
BinaryFormat
[BinaryFormat] Teach identify_magic about Tapi files.
2019-08-21 21:00:16 +00:00
Bitcode
Do a sweep of symbol internalization. NFC.
2019-08-23 19:59:23 +00:00
Bitstream
[Bitcode] Move Bitstream to a separate library
2019-07-03 22:40:07 +00:00
CodeGen
[SelectionDAGBuilder] Hide existence of ConstantDataVector vector from visitGetElementPtr.
2019-08-27 06:39:50 +00:00
DebugInfo
Removing block comments from CodeView records in assembly files & related code cleanup
2019-08-25 01:09:11 +00:00
Demangle
llvm-undname: Correctly demangle vararg parameters
2019-06-04 19:10:08 +00:00
ExecutionEngine
[ORC] Make sure that queries on emitted-but-not-ready symbols fail correctly.
2019-08-26 21:42:51 +00:00
Fuzzer
…
FuzzMutate
[llvm] Migrate llvm::make_unique to std::make_unique
2019-08-15 15:54:37 +00:00
IR
[Constant] Add 'isElementWiseEqual()' method
2019-08-24 06:49:51 +00:00
IRReader
[IRReader] Expose getLazyIRModule
2019-02-11 22:01:13 +00:00
LineEditor
[CMake] Delete redundant DEPENDS/LINK_LIBS from LineEditor/XRay
2019-06-22 01:50:21 +00:00
Linker
Linker: Add support for GlobalIFunc.
2019-08-08 22:09:18 +00:00
LTO
Do a sweep of symbol internalization. NFC.
2019-08-23 19:59:23 +00:00
MC
[PowerPC][AIX] Adds support for writing the .data section in assembly files
2019-08-25 15:17:25 +00:00
MCA
[MCA] consistently use MCPhysReg instead of unsigned as register type. NFCI
2019-08-22 13:32:17 +00:00
Object
[Object] FIX: update PlatformKind name in TapiFile
2019-08-21 23:57:57 +00:00
ObjectYAML
[yaml2obj] - Don't allow setting StOther and Other/Visibility at the same time.
2019-08-27 09:58:39 +00:00
Option
[llvm] Migrate llvm::make_unique to std::make_unique
2019-08-15 15:54:37 +00:00
Passes
[LoopPassManager + MemorySSA] Only enable use of MemorySSA for LPMs known to preserve it.
2019-08-21 17:00:57 +00:00
ProfileData
[SampleFDO] Extract the code calling each section reader to readOneSection.
2019-08-26 15:54:16 +00:00
Remarks
Do a sweep of symbol internalization. NFC.
2019-08-23 19:59:23 +00:00
Support
Do a sweep of symbol internalization. NFC.
2019-08-23 19:59:23 +00:00
TableGen
[llvm] Migrate llvm::make_unique to std::make_unique
2019-08-15 15:54:37 +00:00
Target
AArch64: avoid creating cycle in DAG for post-increment NEON ops.
2019-08-27 10:21:11 +00:00
Testing
[Testing] Move clangd::Annotations to llvm testing support
2019-04-25 10:08:31 +00:00
TextAPI
[TextAPI] Update reader to be supported by lib/Object
2019-08-16 15:30:48 +00:00
ToolDrivers
[llvm-dlltool] Make sure to strip decorations from ExtName for renamed exports
2019-08-23 11:18:11 +00:00
Transforms
[InstCombine] Fold select with ctlz to cttz
2019-08-27 10:22:40 +00:00
WindowsManifest
Fight a bit against global initializers. NFC.
2019-08-22 19:43:27 +00:00
XRay
[llvm] Migrate llvm::make_unique to std::make_unique
2019-08-15 15:54:37 +00:00
CMakeLists.txt
Fix build errors LLVM tests are disabled.
2019-07-11 22:08:35 +00:00
LLVMBuild.txt
[Bitcode] Move Bitstream to a separate library
2019-07-03 22:40:07 +00:00