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Simon Pilgrim 95d021ba68 [APInt] Add APInt::extractBits() method to extract APInt subrange (reapplied) 
The current pattern for extract bits in range is typically:

Mask.lshr(BitOffset).trunc(SubSizeInBits);

Which can be particularly slow for large APInts (MaskSizeInBits > 64) as they require the allocation of memory for the temporary variable.

This is another of the compile time issues identified in PR32037 (see also D30265).

This patch adds the APInt::extractBits() helper method which avoids the temporary memory allocation.

Differential Revision: https://reviews.llvm.org/D30336

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296272 91177308-0d34-0410-b5e6-96231b3b80d8
2017-02-25 20:01:58 +00:00
bindings Go binding: Add methods for missing PassManagerBuilder C APIs 2017-02-17 05:41:05 +00:00
cmake [Support] Provide linux/magic.h fallback for older kernels 2017-02-22 18:09:15 +00:00
docs [Doc] Modernize programmers manual 2017-02-25 10:33:37 +00:00
examples llvm/examples/Kaleidoscope/BuildingAJIT: More fixup corresponding to r295636. 2017-02-20 10:07:41 +00:00
include [APInt] Add APInt::extractBits() method to extract APInt subrange (reapplied) 2017-02-25 20:01:58 +00:00
lib [APInt] Add APInt::extractBits() method to extract APInt subrange (reapplied) 2017-02-25 20:01:58 +00:00
projects [CMake] Correct configuration order of the sub-projects based on ther dependancies 2016-10-09 20:38:29 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
runtimes [CMake] Handle common options for runtimes build 2017-01-10 19:47:05 +00:00
test [AVX-512] Fix the execution domain for scalar FMA instructions. 2017-02-25 19:36:28 +00:00
tools Revert r296215, "[PDB] General improvements to Stream library." and followings. 2017-02-25 17:04:23 +00:00
unittests [APInt] Add APInt::extractBits() method to extract APInt subrange (reapplied) 2017-02-25 20:01:58 +00:00
utils [utils] allow auto-generation of checks for thumb triples 2017-02-24 21:47:44 +00:00
.arcconfig project_id is from another era in phabricator land and does not provide any value. 2016-09-27 15:47:29 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitignore [.gitignore] Update .gitignore to ignore a nested build directory 2017-02-24 23:09:30 +00:00
CMakeLists.txt [Tablegen] Instrumenting table gen DAGGenISelDAG 2017-02-14 18:32:41 +00:00
CODE_OWNERS.TXT Collapse my two entries in CODE_OWNERS.txt 2017-02-15 23:45:21 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Revert r294228 2017-02-06 19:40:56 +00:00
LICENSE.TXT Bump year to 2017 in LICENSE.txt 2017-01-12 18:02:42 +00:00
llvm.spec.in [Sparc] Implement i64 load/store support for 32-bit sparc. 2015-08-10 19:11:39 +00:00
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
README.txt Test commit: remove a blank line. 2017-02-03 10:56:57 +00:00
RELEASE_TESTERS.TXT Update the release tester for MIPS. NFC. 2017-01-17 11:00:28 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.