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Michał Górny 09b53121c3 [compiler-rt] [scudo] Use -mcrc32 on x86 when available 
Update the hardware CRC32 logic in scudo to support using `-mcrc32`
instead of `-msse4.2`.  The CRC32 intrinsics use the former flag
in the newer compiler versions, e.g. in clang since 12fa608af4.
With these compilers, passing `-msse4.2` is insufficient to enable
the instructions and causes build failures when `-march` does not enable
CRC32:

    /var/tmp/portage/sys-libs/compiler-rt-sanitizers-14.0.0/work/compiler-rt/lib/scudo/scudo_crc32.cpp:20:10: error: always_inline function '_mm_crc32_u32' requires target feature 'crc32', but would be inlined into function 'computeHardwareCRC32' that is compiled without support for 'crc32'
      return CRC32_INTRINSIC(Crc, Data);
             ^
    /var/tmp/portage/sys-libs/compiler-rt-sanitizers-14.0.0/work/compiler-rt/lib/scudo/scudo_crc32.h:27:27: note: expanded from macro 'CRC32_INTRINSIC'
    #  define CRC32_INTRINSIC FIRST_32_SECOND_64(_mm_crc32_u32, _mm_crc32_u64)
                              ^
    /var/tmp/portage/sys-libs/compiler-rt-sanitizers-14.0.0/work/compiler-rt/lib/scudo/../sanitizer_common/sanitizer_platform.h:132:36: note: expanded from macro 'FIRST_32_SECOND_64'
    #  define FIRST_32_SECOND_64(a, b) (a)
                                       ^
    1 error generated.

For backwards compatibility, use `-mcrc32` when available and fall back
to `-msse4.2`.  The `<smmintrin.h>` header remains in use as it still
works and is compatible with GCC, while clang's `<crc32intrin.h>`
is not.

Originally reported in https://bugs.gentoo.org/835870.

Differential Revision: https://reviews.llvm.org/D122789
 		2022-03-31 17:49:42 +02:00
..
cmake [compiler-rt] [scudo] Use -mcrc32 on x86 when available 2022-03-31 17:49:42 +02:00
docs Prepare Compiler-RT for GnuInstallDirs, matching libcxx, document all 2021-07-13 15:21:41 +00:00
include [memprof] Initialize MemInfoBlock data. 2022-03-22 14:35:57 -07:00
lib [compiler-rt] [scudo] Use -mcrc32 on x86 when available 2022-03-31 17:49:42 +02:00
test [TSan] Add a runtime flag to print full thread creation stacks up to the main thread 2022-03-24 17:30:27 +01:00
tools [GWP-ASan] Add inbuilt options parser. 2021-01-15 12:57:05 -08:00
unittests Use lit_config.substitute instead of foo % lit_config.params everywhere 2022-03-16 09:57:41 +01:00
utils [compiler-rt] NFC: Fix trivial typo 2021-09-04 14:12:58 +05:30
www [compiler-rt] Remove forgotten mention of SVN modules, LLVM now uses Git. 2022-03-23 15:29:30 +01:00
.clang-tidy NFC: .clang-tidy: Inherit configs from parents to improve maintainability 2021-06-08 08:25:59 -07:00
.gitignore
…
CMakeLists.txt [CMake] Use generator expression to get in-tree libc++ path 2022-01-26 14:12:48 -08:00
CODE_OWNERS.TXT
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CREDITS.TXT
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LICENSE.TXT
…
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.

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