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Kostya Kortchinsky 0207b6fbbf [scudo] Overhaul hardware CRC32 feature detection 
Summary:
This patch aims at condensing the hardware CRC32 feature detection and making
it slightly more effective on Android.

The following changes are included:
- remove the `CPUFeature` enum, and get rid of one level of nesting of
  functions: we only used CRC32, so we just implement and use
  `hasHardwareCRC32`;
- allow for a weak `getauxval`: the Android toolchain is compiled at API level
  14 for Android ARM, meaning no `getauxval` at compile time, yet we will run
  on API level 27+ devices. The `/proc/self/auxv` fallback can work but is
  worthless for a process like `init` where the proc filesystem doesn't exist
  yet. If a weak `getauxval` doesn't exist, then fallback.
- couple of extra corrections.

Reviewers: alekseyshl

Reviewed By: alekseyshl

Subscribers: kubamracek, aemerson, srhines, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D40322

llvm-svn: 318859
 		2017-11-22 18:30:44 +00:00
..
cmake Allow compiler-rt test targets to work with multi-config CMake generators 2017-11-13 12:57:54 +00:00
docs [sanitizers] Make it possible to XFAIL on the effective target, not just the default. 2016-08-09 11:50:53 +00:00
include [XRay][compiler-rt] Migrate basic mode logging to the XRay framework 2017-11-21 07:29:21 +00:00
lib [scudo] Overhaul hardware CRC32 feature detection 2017-11-22 18:30:44 +00:00
test [XRay][compiler-rt] Migrate basic mode logging to the XRay framework 2017-11-21 07:29:21 +00:00
unittests Allow compiler-rt test targets to work with multi-config CMake generators 2017-11-13 12:57:54 +00:00
www Update references to new lists.llvm.org mailing lists. 2015-08-05 03:58:00 +00:00
.arcconfig Upgrade all the .arcconfigs to https. 2016-07-14 13:15:37 +00:00
.gitignore Add .pyc files to .gitignore to compiler-rt 2017-07-24 21:51:12 +00:00
CMakeLists.txt [asan] Add CMake hook to override shadow scale in compiler_rt 2017-11-13 14:02:27 +00:00
CODE_OWNERS.TXT [sanitizers] remove earthdok@ from owners 2016-05-18 18:52:18 +00:00
CREDITS.TXT
…
LICENSE.TXT Update copyright year to 2016. 2016-03-30 22:38:50 +00:00
README.txt
…

README.txt 

Compiler-RT
================================

This directory and its subdirectories contain source code for the compiler
support routines.

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

================================