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Craig Topper fe36cc5008 [X86] Restore X86ISelDAGToDAG::matchBEXTRFromAnd. Teach address matching to create a BEXTR pattern from a (shl (and X, mask >> C1) if C1 can be folded into addressing mode. 
This is an alternative to D53080 since I think using a BEXTR for a shifted mask is definitely an improvement when the shl can be absorbed into addressing mode. The other cases I'm less sure about.

We already have several tricks for handling an and of a shift in address matching. This adds a new case for BEXTR.

I've moved the BEXTR matching code back to X86ISelDAGToDAG to allow it to match. I suppose alternatively we could directly emit a X86ISD::BEXTR node that isel could pattern match. But I'm trying to view BEXTR matching as an isel concern so DAG combine can see 'and' and 'shift' operations that are well understood. We did lose a couple cases from tbm_patterns.ll, but I think there are ways to recover that.

I've also put back the manual load folding code in matchBEXTRFromAnd that I removed a few months ago in r324939. This gives us some more freedom to make decisions based on the ability to fold a load. I haven't done anything with that yet.

Differential Revision: https://reviews.llvm.org/D53126

llvm-svn: 344270
2018-10-11 18:06:07 +00:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings [bindings/go] Add Go bindings to the Token type 2018-09-28 17:39:59 +00:00
cmake [CMake] Temporarily remove the LLVM_ENABLE_IDE option 2018-10-11 04:06:14 +00:00
docs [doc] Update the programmer's manual about SmallSet's iterator 2018-10-04 12:33:33 +00:00
examples [ORC] Fix BuildingAJIT tutorial examples that were broken by r343059. 2018-09-26 04:00:58 +00:00
include [InstCombine] Fix SimplifyLibCalls erasing an instruction while IC still had references to it. 2018-10-11 14:51:11 +00:00
lib [X86] Restore X86ISelDAGToDAG::matchBEXTRFromAnd. Teach address matching to create a BEXTR pattern from a (shl (and X, mask >> C1) if C1 can be folded into addressing mode. 2018-10-11 18:06:07 +00:00
projects [cmake] Support moving debuginfo-tests to llvm/projects 2017-12-12 17:06:08 +00:00
resources
runtimes Revert "[CMake] Pass Clang defaults to runtimes builds" 2018-07-13 20:01:55 +00:00
test [X86] Restore X86ISelDAGToDAG::matchBEXTRFromAnd. Teach address matching to create a BEXTR pattern from a (shl (and X, mask >> C1) if C1 can be folded into addressing mode. 2018-10-11 18:06:07 +00:00
tools [llvm-nm] Fix crash when running with --print-armap on corrupt archives. 2018-10-11 17:55:11 +00:00
unittests Support for remapping profile data when symbols change, for sample-based 2018-10-10 21:31:01 +00:00
utils [tblgen][CodeGenSchedule] Add a check for invalid RegisterFile definitions with zero physical registers. 2018-10-11 10:39:03 +00:00
.arcconfig [llvm] Set up .arcconfig to point to Diffusion L repository 2018-01-12 15:37:41 +00:00
.clang-format
.clang-tidy
.gitattributes [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 2018-05-09 02:40:45 +00:00
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt [WebAssembly] Add WebAssembly to LLVM_ALL_TARGETS 2018-10-03 23:56:52 +00:00
CODE_OWNERS.TXT Add owner for llvm-objcopy 2018-08-09 22:05:19 +00:00
configure
CREDITS.TXT Update my information in the CREDITS file. 2018-06-15 20:02:11 +00:00
LICENSE.TXT Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm.spec.in
LLVMBuild.txt
README.txt Test commit. 2018-09-22 01:01:03 +00:00
RELEASE_TESTERS.TXT Remove myself from the release testers list. (NFC) 2018-06-20 21:25:50 +00:00

README.txt 

The LLVM Compiler Infrastructure
================================

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
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Please see the documentation provided in docs/ for further
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If you are writing a package for LLVM, see docs/Packaging.rst for our
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