AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-01-11 03:40:06 +00:00
Code Issues Packages Projects Releases Wiki Activity
38,457 Commits 335 Branches 1,646 Tags 311 MiB
29f833f5ab
Commit Graph

38457 Commits

This Branch
This Branch
All Branches
Author SHA1 Message Date
Florian Weimer
29f833f5ab Linux: Remove DL_FIND_ARG_COMPONENTS 
The generic definition is always used since the Native Client
port has been removed.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
(cherry picked from commit 2d47fa6862)
 2022-05-17 08:08:52 +02:00
Florian Weimer
1695c5e0f6 Linux: Remove HAVE_AUX_SECURE, HAVE_AUX_XID, HAVE_AUX_PAGESIZE 
They are always defined.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
(cherry picked from commit b9c3d3382f)
 2022-05-17 08:08:52 +02:00
Florian Weimer
756d583c9e elf: Merge dl-sysdep.c into the Linux version 
The generic version is the de-facto Linux implementation.  It
requires an auxiliary vector, so Hurd does not use it.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
(cherry picked from commit 91c0a47ffb)
 2022-05-17 08:08:52 +02:00
Noah Goldstein
2c4fc8e5ca x86: Optimize {str|wcs}rchr-evex 
The new code unrolls the main loop slightly without adding too much
overhead and minimizes the comparisons for the search CHAR.

Geometric Mean of all benchmarks New / Old: 0.755
See email for all results.

Full xcheck passes on x86_64 with and without multiarch enabled.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit c966099cdc)
 2022-05-16 12:42:46 -07:00
Noah Goldstein
fdbc8439ac x86: Optimize {str|wcs}rchr-avx2 
The new code unrolls the main loop slightly without adding too much
overhead and minimizes the comparisons for the search CHAR.

Geometric Mean of all benchmarks New / Old: 0.832
See email for all results.

Full xcheck passes on x86_64 with and without multiarch enabled.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit df7e295d18)
 2022-05-16 12:40:38 -07:00
Noah Goldstein
b05c0c8b28 x86: Optimize {str|wcs}rchr-sse2 
The new code unrolls the main loop slightly without adding too much
overhead and minimizes the comparisons for the search CHAR.

Geometric Mean of all benchmarks New / Old: 0.741
See email for all results.

Full xcheck passes on x86_64 with and without multiarch enabled.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 5307aa9c18)
 2022-05-16 12:37:03 -07:00
H.J. Lu
bc35e22be4 x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32 
Clear the upper 32 bits in RDX (memory size) for x32 to fix

FAIL: string/tst-size_t-memcmp
FAIL: string/tst-size_t-memcmp-2
FAIL: string/tst-size_t-memcpy
FAIL: wcsmbs/tst-size_t-wmemcmp

on x32 introduced by

8804157ad9 x86: Optimize memcmp SSE2 in memcmp.S
26b2478322 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3

Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit 8ea20ee5f6)
 2022-05-16 12:34:52 -07:00
Noah Goldstein
4d1841deb7 x86: Fix missing __wmemcmp def for disable-multiarch build 
commit 8804157ad9
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Fri Apr 15 12:27:59 2022 -0500

    x86: Optimize memcmp SSE2 in memcmp.S

Only defined wmemcmp and missed __wmemcmp. This commit fixes that by
defining __wmemcmp and setting wmemcmp as a weak alias to __wmemcmp.

Both multiarch and disable-multiarch builds succeed and full xchecks
pass.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit c72a1a062a)
 2022-05-16 12:31:39 -07:00
Noah Goldstein
cee9939f67 x86: Cleanup page cross code in memcmp-avx2-movbe.S 
Old code was both inefficient and wasted code size. New code (-62
bytes) and comparable or better performance in the page cross case.

geometric_mean(N=20) of page cross cases New / Original: 0.960

size, align0, align1, ret, New Time/Old Time
   1,   4095,      0,   0,             1.001
   1,   4095,      0,   1,             0.999
   1,   4095,      0,  -1,               1.0
   2,   4094,      0,   0,               1.0
   2,   4094,      0,   1,               1.0
   2,   4094,      0,  -1,               1.0
   3,   4093,      0,   0,               1.0
   3,   4093,      0,   1,               1.0
   3,   4093,      0,  -1,               1.0
   4,   4092,      0,   0,             0.987
   4,   4092,      0,   1,               1.0
   4,   4092,      0,  -1,               1.0
   5,   4091,      0,   0,             0.984
   5,   4091,      0,   1,             1.002
   5,   4091,      0,  -1,             1.005
   6,   4090,      0,   0,             0.993
   6,   4090,      0,   1,             1.001
   6,   4090,      0,  -1,             1.003
   7,   4089,      0,   0,             0.991
   7,   4089,      0,   1,               1.0
   7,   4089,      0,  -1,             1.001
   8,   4088,      0,   0,             0.875
   8,   4088,      0,   1,             0.881
   8,   4088,      0,  -1,             0.888
   9,   4087,      0,   0,             0.872
   9,   4087,      0,   1,             0.879
   9,   4087,      0,  -1,             0.883
  10,   4086,      0,   0,             0.878
  10,   4086,      0,   1,             0.886
  10,   4086,      0,  -1,             0.873
  11,   4085,      0,   0,             0.878
  11,   4085,      0,   1,             0.881
  11,   4085,      0,  -1,             0.879
  12,   4084,      0,   0,             0.873
  12,   4084,      0,   1,             0.889
  12,   4084,      0,  -1,             0.875
  13,   4083,      0,   0,             0.873
  13,   4083,      0,   1,             0.863
  13,   4083,      0,  -1,             0.863
  14,   4082,      0,   0,             0.838
  14,   4082,      0,   1,             0.869
  14,   4082,      0,  -1,             0.877
  15,   4081,      0,   0,             0.841
  15,   4081,      0,   1,             0.869
  15,   4081,      0,  -1,             0.876
  16,   4080,      0,   0,             0.988
  16,   4080,      0,   1,              0.99
  16,   4080,      0,  -1,             0.989
  17,   4079,      0,   0,             0.978
  17,   4079,      0,   1,             0.981
  17,   4079,      0,  -1,              0.98
  18,   4078,      0,   0,             0.981
  18,   4078,      0,   1,              0.98
  18,   4078,      0,  -1,             0.985
  19,   4077,      0,   0,             0.977
  19,   4077,      0,   1,             0.979
  19,   4077,      0,  -1,             0.986
  20,   4076,      0,   0,             0.977
  20,   4076,      0,   1,             0.986
  20,   4076,      0,  -1,             0.984
  21,   4075,      0,   0,             0.977
  21,   4075,      0,   1,             0.983
  21,   4075,      0,  -1,             0.988
  22,   4074,      0,   0,             0.983
  22,   4074,      0,   1,             0.994
  22,   4074,      0,  -1,             0.993
  23,   4073,      0,   0,              0.98
  23,   4073,      0,   1,             0.992
  23,   4073,      0,  -1,             0.995
  24,   4072,      0,   0,             0.989
  24,   4072,      0,   1,             0.989
  24,   4072,      0,  -1,             0.991
  25,   4071,      0,   0,              0.99
  25,   4071,      0,   1,             0.999
  25,   4071,      0,  -1,             0.996
  26,   4070,      0,   0,             0.993
  26,   4070,      0,   1,             0.995
  26,   4070,      0,  -1,             0.998
  27,   4069,      0,   0,             0.993
  27,   4069,      0,   1,             0.999
  27,   4069,      0,  -1,               1.0
  28,   4068,      0,   0,             0.997
  28,   4068,      0,   1,               1.0
  28,   4068,      0,  -1,             0.999
  29,   4067,      0,   0,             0.996
  29,   4067,      0,   1,             0.999
  29,   4067,      0,  -1,             0.999
  30,   4066,      0,   0,             0.991
  30,   4066,      0,   1,             1.001
  30,   4066,      0,  -1,             0.999
  31,   4065,      0,   0,             0.988
  31,   4065,      0,   1,             0.998
  31,   4065,      0,  -1,             0.998
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 23102686ec)
 2022-05-16 12:28:37 -07:00
Noah Goldstein
0909286ffa x86: Remove memcmp-sse4.S 
Code didn't actually use any sse4 instructions since `ptest` was
removed in:

commit 2f9062d717
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Wed Nov 10 16:18:56 2021 -0600

    x86: Shrink memcmp-sse4.S code size

The new memcmp-sse2 implementation is also faster.

geometric_mean(N=20) of page cross cases SSE2 / SSE4: 0.905

Note there are two regressions preferring SSE2 for Size = 1 and Size =
65.

Size = 1:
size, align0, align1, ret, New Time/Old Time
   1,      1,      1,   0,               1.2
   1,      1,      1,   1,             1.197
   1,      1,      1,  -1,               1.2

This is intentional. Size == 1 is significantly less hot based on
profiles of GCC11 and Python3 than sizes [4, 8] (which is made
hotter).

Python3 Size = 1        -> 13.64%
Python3 Size = [4, 8]   -> 60.92%

GCC11   Size = 1        ->  1.29%
GCC11   Size = [4, 8]   -> 33.86%

size, align0, align1, ret, New Time/Old Time
   4,      4,      4,   0,             0.622
   4,      4,      4,   1,             0.797
   4,      4,      4,  -1,             0.805
   5,      5,      5,   0,             0.623
   5,      5,      5,   1,             0.777
   5,      5,      5,  -1,             0.802
   6,      6,      6,   0,             0.625
   6,      6,      6,   1,             0.813
   6,      6,      6,  -1,             0.788
   7,      7,      7,   0,             0.625
   7,      7,      7,   1,             0.799
   7,      7,      7,  -1,             0.795
   8,      8,      8,   0,             0.625
   8,      8,      8,   1,             0.848
   8,      8,      8,  -1,             0.914
   9,      9,      9,   0,             0.625

Size = 65:
size, align0, align1, ret, New Time/Old Time
  65,      0,      0,   0,             1.103
  65,      0,      0,   1,             1.216
  65,      0,      0,  -1,             1.227
  65,     65,      0,   0,             1.091
  65,      0,     65,   1,              1.19
  65,     65,     65,  -1,             1.215

This is because A) the checks in range [65, 96] are now unrolled 2x
and B) because smaller values <= 16 are now given a hotter path. By
contrast the SSE4 version has a branch for Size = 80. The unrolled
version has get better performance for returns which need both
comparisons.

size, align0, align1, ret, New Time/Old Time
 128,      4,      8,   0,             0.858
 128,      4,      8,   1,             0.879
 128,      4,      8,  -1,             0.888

As well, out of microbenchmark environments that are not full
predictable the branch will have a real-cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 7cbc03d030)
 2022-05-16 12:25:18 -07:00
Noah Goldstein
5a8df6485c x86: Optimize memcmp SSE2 in memcmp.S 
New code save size (-303 bytes) and has significantly better
performance.

geometric_mean(N=20) of page cross cases New / Original: 0.634
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 8804157ad9)
 2022-05-16 12:19:59 -07:00
Noah Goldstein
af0865571a x86: Small improvements for wcslen 
Just a few QOL changes.
    1. Prefer `add` > `lea` as it has high execution units it can run
       on.
    2. Don't break macro-fusion between `test` and `jcc`
    3. Reduce code size by removing gratuitous padding bytes (-90
       bytes).

geometric_mean(N=20) of all benchmarks New / Original: 0.959

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 244b415d38)
 2022-05-16 12:17:42 -07:00
Noah Goldstein
3b710e32d8 x86: Remove AVX str{n}casecmp 
The rational is:

1. SSE42 has nearly identical logic so any benefit is minimal (3.4%
   regression on Tigerlake using SSE42 versus AVX across the
   benchtest suite).
2. AVX2 version covers the majority of targets that previously
   prefered it.
3. The targets where AVX would still be best (SnB and IVB) are
   becoming outdated.

All in all the saving the code size is worth it.

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 305769b2a1)
 2022-05-16 12:12:10 -07:00
Noah Goldstein
fc5d42bf82 x86: Add EVEX optimized str{n}casecmp 
geometric_mean(N=40) of all benchmarks EVEX / SSE42: .621

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 84e7c46df4)
 2022-05-16 12:07:56 -07:00
Noah Goldstein
33fcf8344f x86: Add AVX2 optimized str{n}casecmp 
geometric_mean(N=40) of all benchmarks AVX2 / SSE42: .702

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit bbf8122234)
 2022-05-16 12:00:53 -07:00
Noah Goldstein
3496d64d69 x86: Optimize str{n}casecmp TOLOWER logic in strcmp-sse42.S 
Slightly faster method of doing TOLOWER that saves an
instruction.

Also replace the hard coded 5-byte no with .p2align 4. On builds with
CET enabled this misaligned entry to strcasecmp.

geometric_mean(N=40) of all benchmarks New / Original: .920

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit d154758e61)
 2022-05-16 11:59:00 -07:00
Noah Goldstein
283982b362 x86: Optimize str{n}casecmp TOLOWER logic in strcmp.S 
Slightly faster method of doing TOLOWER that saves an
instruction.

Also replace the hard coded 5-byte no with .p2align 4. On builds with
CET enabled this misaligned entry to strcasecmp.

geometric_mean(N=40) of all benchmarks New / Original: .894

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 670b54bc58)
 2022-05-16 11:56:16 -07:00
Noah Goldstein
420cd6f155 x86: Remove strspn-sse2.S and use the generic implementation 
The generic implementation is faster.

geometric_mean(N=20) of all benchmarks New / Original: .710

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 9c8a6ad620)
 2022-05-16 11:52:47 -07:00
Noah Goldstein
4b61d76521 x86: Remove strpbrk-sse2.S and use the generic implementation 
The generic implementation is faster (see strcspn commit).

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 6533585352)
 2022-05-16 11:48:09 -07:00
Noah Goldstein
2fef1961a7 x86: Remove strcspn-sse2.S and use the generic implementation 
The generic implementation is faster.

geometric_mean(N=20) of all benchmarks New / Original: .678

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit fe28e7d9d9)
 2022-05-16 10:56:35 -07:00
Noah Goldstein
1ed2813eb1 x86: Optimize strspn in strspn-c.c 
Use _mm_cmpeq_epi8 and _mm_movemask_epi8 to get strlen instead of
_mm_cmpistri. Also change offset to unsigned to avoid unnecessary
sign extensions.

geometric_mean(N=20) of all benchmarks that dont fallback on
sse2; New / Original: .901

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 412d103431)
 2022-05-16 10:51:41 -07:00
Noah Goldstein
3214c878f2 x86: Optimize strcspn and strpbrk in strcspn-c.c 
Use _mm_cmpeq_epi8 and _mm_movemask_epi8 to get strlen instead of
_mm_cmpistri. Also change offset to unsigned to avoid unnecessary
sign extensions.

geometric_mean(N=20) of all benchmarks that dont fallback on
sse2/strlen; New / Original: .928

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 30d627d477)
 2022-05-16 10:45:15 -07:00
Noah Goldstein
ff9772ac19 x86: Code cleanup in strchr-evex and comment justifying branch 
Small code cleanup for size: -81 bytes.

Add comment justifying using a branch to do NULL/non-null return.

All string/memory tests pass and no regressions in benchtests.

geometric_mean(N=20) of all benchmarks New / Original: .985
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit ec285ea904)
 2022-05-16 10:42:53 -07:00
Noah Goldstein
424bbd4d25 x86: Code cleanup in strchr-avx2 and comment justifying branch 
Small code cleanup for size: -53 bytes.

Add comment justifying using a branch to do NULL/non-null return.

All string/memory tests pass and no regressions in benchtests.

geometric_mean(N=20) of all benchmarks Original / New: 1.00
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit a6fbf4d51e)
 2022-05-16 10:39:59 -07:00
Adhemerval Zanella
0a10b8b181 x86_64: Remove bcopy optimizations 
The symbols is not present in current POSIX specification and compiler
already generates memmove call.

(cherry picked from commit bf92893a14)
 2022-05-16 10:36:04 -07:00
H.J. Lu
f0a53588da x86-64: Define __memcmpeq in ld.so 
Define __memcmpeq in ld.so so that compiler can generate __memcmpeq call
when compiling for ld.so.

(cherry picked from commit a5659cf27d)
 2022-05-16 10:33:14 -07:00
H.J. Lu
a133623048 x86-64: Remove bzero weak alias in SS2 memset 
commit 3d9f171bfb
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Feb 7 05:55:15 2022 -0800

    x86-64: Optimize bzero

added the optimized bzero.  Remove bzero weak alias in SS2 memset to
avoid undefined __bzero in memset-sse2-unaligned-erms.

(cherry picked from commit 0fb8800029)
 2022-05-16 10:29:20 -07:00
H.J. Lu
18baf86f51 x86_64/multiarch: Sort sysdep_routines and put one entry per line 
(cherry picked from commit c328d0152d)
 2022-05-16 10:26:53 -07:00
H.J. Lu
d422197a69 x86: Improve L to support L(XXX_SYMBOL (YYY, ZZZ)) 
(cherry picked from commit 1283948f23)
 2022-05-16 10:20:57 -07:00
Siddhesh Poyarekar
58947e1fa5 fortify: Ensure that __glibc_fortify condition is a constant [BZ #29141] 
The fix c8ee1c85 introduced a -1 check for object size without also
checking that object size is a constant.  Because of this, the tree
optimizer passes in gcc fail to fold away one of the branches in
__glibc_fortify and trips on a spurious Wstringop-overflow.  The warning
itself is incorrect and the branch does go away eventually in DCE in the
rtl passes in gcc, but the constant check is a helpful hint to simplify
code early, so add it in.

Resolves: BZ #29141
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
 2022-05-16 21:28:38 +05:30
Florian Weimer
28ea43f8d6 dlfcn: Implement the RTLD_DI_PHDR request type for dlinfo 
The information is theoretically available via dl_iterate_phdr as
well, but that approach is very slow if there are many shared
objects.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@rehdat.com>
(cherry picked from commit d056c21213)
 2022-05-11 19:17:47 +02:00
Florian Weimer
78f82ab4ef manual: Document the dlinfo function 
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@rehdat.com>
(cherry picked from commit 93804a1ee0)
 2022-05-11 19:17:47 +02:00
Adhemerval Zanella
bbb017a2bb NEWS: Add a bug fix entry for BZ #29109 2022-05-06 11:34:18 -03:00
Adhemerval Zanella
5c0d94d780 linux: Fix posix_spawn return code if clone fails (BZ#29109) 
The __clone_internal returns the error on errno.

Checked on x86_64-linux-gnu.

(cherry picked from commit 71e2a681f1)
 2022-05-06 11:09:52 -03:00
Noah Goldstein
059e36d9ed x86: Fix fallback for wcsncmp_avx2 in strcmp-avx2.S [BZ #28896] 
Overflow case for __wcsncmp_avx2_rtm should be __wcscmp_avx2_rtm not
__wcscmp_avx2.

commit ddf0992cf5
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Sun Jan 9 16:02:21 2022 -0600

    x86: Fix __wcsncmp_avx2 in strcmp-avx2.S [BZ# 28755]

Set the wrong fallback function for `__wcsncmp_avx2_rtm`. It was set
to fallback on to `__wcscmp_avx2` instead of `__wcscmp_avx2_rtm` which
can cause spurious aborts.

This change will need to be backported.

All string/memory tests pass.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit 9fef7039a7)
 2022-05-04 22:41:54 -07:00
Noah Goldstein
676f7bcf11 x86: Fix bug in strncmp-evex and strncmp-avx2 [BZ #28895] 
Logic can read before the start of `s1` / `s2` if both `s1` and `s2`
are near the start of a page. To avoid having the result contimated by
these comparisons the `strcmp` variants would mask off these
comparisons. This was missing in the `strncmp` variants causing
the bug. This commit adds the masking to `strncmp` so that out of
range comparisons don't affect the result.

test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass as
well a full xcheck on x86_64 linux.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit e108c02a5e)
 2022-05-04 22:41:15 -07:00
Noah Goldstein
c394d7e11a x86: Set .text section in memset-vec-unaligned-erms 
commit 3d9f171bfb
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Feb 7 05:55:15 2022 -0800

    x86-64: Optimize bzero

Remove setting the .text section for the code. This commit
adds that back.

(cherry picked from commit 7912236f4a)
 2022-05-04 22:40:57 -07:00
H.J. Lu
de0cd691b2 x86-64: Optimize bzero 
memset with zero as the value to set is by far the majority value (99%+
for Python3 and GCC).

bzero can be slightly more optimized for this case by using a zero-idiom
xor for broadcasting the set value to a register (vector or GPR).

Co-developed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit 3d9f171bfb)
 2022-05-04 22:40:21 -07:00
Noah Goldstein
0bf9c8b5fe x86: Remove SSSE3 instruction for broadcast in memset.S (SSE2 Only) 
commit b62ace2740
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Sun Feb 6 00:54:18 2022 -0600

    x86: Improve vec generation in memset-vec-unaligned-erms.S

Revert usage of 'pshufb' in broadcast logic as it is an SSSE3
instruction and memset.S is restricted to only SSE2 instructions.

(cherry picked from commit 1b0c60f95b)
 2022-05-04 22:40:04 -07:00
Noah Goldstein
58596411ad x86: Improve vec generation in memset-vec-unaligned-erms.S 
No bug.

Split vec generation into multiple steps. This allows the
broadcast in AVX2 to use 'xmm' registers for the L(less_vec)
case. This saves an expensive lane-cross instruction and removes
the need for 'vzeroupper'.

For SSE2 replace 2x 'punpck' instructions with zero-idiom 'pxor' for
byte broadcast.

Results for memset-avx2 small (geomean of N = 20 benchset runs).

size, New Time, Old Time, New / Old
   0,    4.100,    3.831,     0.934
   1,    5.074,    4.399,     0.867
   2,    4.433,    4.411,     0.995
   4,    4.487,    4.415,     0.984
   8,    4.454,    4.396,     0.987
  16,    4.502,    4.443,     0.987

All relevant string/wcsmbs tests are passing.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

(cherry picked from commit b62ace2740)
 2022-05-04 22:39:44 -07:00
H.J. Lu
36766c02af x86-64: Fix strcmp-evex.S 
Change "movl %edx, %rdx" to "movl %edx, %edx" in:

commit 8418eb3ff4
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Mon Jan 10 15:35:39 2022 -0600

    x86: Optimize strcmp-evex.S

(cherry picked from commit 0e0199a9e0)
 2022-05-04 22:39:24 -07:00
H.J. Lu
250e277797 x86-64: Fix strcmp-avx2.S 
Change "movl %edx, %rdx" to "movl %edx, %edx" in:

commit b77b06e0e2
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Mon Jan 10 15:35:38 2022 -0600

    x86: Optimize strcmp-avx2.S

(cherry picked from commit c15efd011c)
 2022-05-04 22:39:13 -07:00
Noah Goldstein
34ef810945 x86: Optimize strcmp-evex.S 
Optimization are primarily to the loop logic and how the page cross
logic interacts with the loop.

The page cross logic is at times more expensive for short strings near
the end of a page but not crossing the page. This is done to retest
the page cross conditions with a non-faulty check and to improve the
logic for entering the loop afterwards. This is only particular cases,
however, and is general made up for by more than 10x improvements on
the transition from the page cross -> loop case.

The non-page cross cases as well are nearly universally improved.

test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit 8418eb3ff4)
 2022-05-04 22:39:01 -07:00
Noah Goldstein
b68e782f8e x86: Optimize strcmp-avx2.S 
Optimization are primarily to the loop logic and how the page cross
logic interacts with the loop.

The page cross logic is at times more expensive for short strings near
the end of a page but not crossing the page. This is done to retest
the page cross conditions with a non-faulty check and to improve the
logic for entering the loop afterwards. This is only particular cases,
however, and is general made up for by more than 10x improvements on
the transition from the page cross -> loop case.

The non-page cross cases are improved most for smaller sizes [0, 128]
and go about even for (128, 4096]. The loop page cross logic is
improved so some more significant speedup is seen there as well.

test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit b77b06e0e2)
 2022-05-04 22:38:29 -07:00
Siddhesh Poyarekar
ec5b79aac7 manual: Clarify that abbreviations of long options are allowed 
The man page and code comments clearly state that abbreviations of long
option names are recognized correctly as long as they are unique.
Document this fact in the glibc manual as well.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Reviewed-by: Andreas Schwab <schwab@linux-m68k.org>
(cherry picked from commit db1efe02c9)
 2022-05-04 15:58:53 +05:30
Joseph Myers
0bcba53020 Add HWCAP2_AFP, HWCAP2_RPRES from Linux 5.17 to AArch64 bits/hwcap.h 
Add the new HWCAP2_AFP and HWCAP2_RPRES constants from Linux 5.17.
Tested with build-many-glibcs.py for aarch64-linux-gnu.

(cherry picked from commit 866c599182)
 2022-05-03 10:37:20 +02:00
Joseph Myers
95759abbf3 Add SOL_MPTCP, SOL_MCTP from Linux 5.16 to bits/socket.h 
Linux 5.16 adds constants SOL_MPTCP and SOL_MCTP to the getsockopt /
setsockopt levels; add these constants to bits/socket.h.

Tested for x86_64.

(cherry picked from commit fdc1ae67fe)
 2022-05-03 10:37:00 +02:00
Joseph Myers
eed29011f9 Update kernel version to 5.17 in tst-mman-consts.py 
This patch updates the kernel version in the test tst-mman-consts.py
to 5.17.  (There are no new MAP_* constants covered by this test in
5.17 that need any other header changes.)

Tested with build-many-glibcs.py.

(cherry picked from commit 23808a422e)
 2022-05-03 10:36:11 +02:00
Joseph Myers
e72c363a15 Update kernel version to 5.16 in tst-mman-consts.py 
This patch updates the kernel version in the test tst-mman-consts.py
to 5.16.  (There are no new MAP_* constants covered by this test in
5.16 that need any other header changes.)

Tested with build-many-glibcs.py.

(cherry picked from commit 790a607e23)
 2022-05-03 10:36:08 +02:00
Joseph Myers
edc06fdd62 Update syscall lists for Linux 5.17 
Linux 5.17 has one new syscall, set_mempolicy_home_node.  Update
syscall-names.list and regenerate the arch-syscall.h headers with
build-many-glibcs.py update-syscalls.

Tested with build-many-glibcs.py.

(cherry picked from commit 8ef9196b26)
 2022-05-03 10:35:23 +02:00