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Author SHA1 Message Date
Noah Goldstein
4ff6ae069b 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 18:55:09 -07:00
Noah Goldstein
80883f4354 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   becoming outdated.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 18:55:02 -07:00
Noah Goldstein
b13a2e68eb 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 18:54:52 -07:00
Noah Goldstein
3051cf3e74 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 18:54:41 -07:00
Noah Goldstein
3605c74407 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 18:54:27 -07:00
Noah Goldstein
5997011826 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 18:54:17 -07:00
Noah Goldstein
a4b1cae068 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 18:54:09 -07:00
Noah Goldstein
3811544655 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 18:53:59 -07:00
Noah Goldstein
0dafa75e3c 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 18:53:48 -07:00
Noah Goldstein
0a2da01110 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 18:53:39 -07:00
Noah Goldstein
0ae1006967 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 18:53:28 -07:00
Noah Goldstein
dd6d3a0bbc 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 18:53:19 -07:00
Noah Goldstein
3c55c20756 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 18:53:07 -07:00
Adhemerval Zanella
dd457606ca 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 18:52:57 -07:00
H.J. Lu
37f373e334 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 18:52:47 -07:00
H.J. Lu
6cba46c858 x86_64/multiarch: Sort sysdep_routines and put one entry per line 
(cherry picked from commit c328d0152d)
 2022-05-16 18:52:35 -07:00
H.J. Lu
8de6e4a199 x86: Improve L to support L(XXX_SYMBOL (YYY, ZZZ)) 
(cherry picked from commit 1283948f23)
 2022-05-16 18:52:19 -07:00
Siddhesh Poyarekar
b72bbba236 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>
(cherry picked from commit 61a8753010)
 2022-05-16 22:06:54 +05:30
Florian Weimer
91c2e6c3db 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 20:56:53 +02:00
Florian Weimer
e4a2fb76ef 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)

Also includes partial backport of commit 5d28a8962d
(the addition of manual/dynlink.texi).
 2022-05-11 20:56:40 +02:00
Noah Goldstein
e123f08ad5 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)
 2022-05-05 09:13:13 -07:00
Noah Goldstein
5373c90f2e 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)
 2022-05-05 09:11:49 -07:00
Noah Goldstein
70509f9b48 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)
 2022-05-05 09:11:13 -07:00
H.J. Lu
5cb6329652 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)
 2022-05-05 09:10:53 -07:00
Noah Goldstein
190ea5f7e4 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)
 2022-05-05 08:54:23 -07:00
Noah Goldstein
ea19c490a3 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)
 2022-05-05 08:54:11 -07:00
H.J. Lu
53ddafe917 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)
 2022-05-05 08:54:03 -07:00
H.J. Lu
d299032743 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)
 2022-05-05 08:53:50 -07:00
Noah Goldstein
c41a66767d 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)
 2022-05-05 08:53:42 -07:00
Noah Goldstein
0d5b36c8cc 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)
 2022-05-05 08:53:34 -07:00
Siddhesh Poyarekar
31af92b9c8 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 15:59:39 +05:30
Joseph Myers
97cb8227b8 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 11:08:52 +02:00
Szabolcs Nagy
c108e87026 aarch64: Add HWCAP2_ECV from Linux 5.16 
Indicates the availability of enhanced counter virtualization extension
of armv8.6-a with self-synchronized virtual counter CNTVCTSS_EL0 usable
in userspace.

(cherry picked from commit 5a1be8ebdf)
 2022-05-03 11:08:52 +02:00
Joseph Myers
f858bc3093 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 11:08:52 +02:00
Joseph Myers
0499c3a95f 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 11:08:52 +02:00
Joseph Myers
81181ba5d9 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 11:08:52 +02:00
Joseph Myers
6af165658d 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 11:08:52 +02:00
Joseph Myers
5146b73d72 Add ARPHRD_CAN, ARPHRD_MCTP to net/if_arp.h 
Add the constant ARPHRD_MCTP, from Linux 5.15, to net/if_arp.h, along
with ARPHRD_CAN which was added to Linux in version 2.6.25 (commit
cd05acfe65ed2cf2db683fa9a6adb8d35635263b, "[CAN]: Allocate protocol
numbers for PF_CAN") but apparently missed for glibc at the time.

Tested for x86_64.

(cherry picked from commit a94d9659cd)
 2022-05-03 11:07:10 +02:00
Joseph Myers
fd5dbfd1cd Update kernel version to 5.15 in tst-mman-consts.py 
This patch updates the kernel version in the test tst-mman-consts.py
to 5.15.  (There are no new MAP_* constants covered by this test in
5.15 that need any other header changes.)

Tested with build-many-glibcs.py.

(cherry picked from commit 5c3ece451d)
 2022-05-03 11:07:07 +02:00
Joseph Myers
bc6fba3c80 Add PF_MCTP, AF_MCTP from Linux 5.15 to bits/socket.h 
Linux 5.15 adds a new address / protocol family PF_MCTP / AF_MCTP; add
these constants to bits/socket.h.

Tested for x86_64.

(cherry picked from commit bdeb7a8fa9)
 2022-05-03 11:07:03 +02:00
DJ Delorie
c66c92181d posix/glob.c: update from gnulib 
Copied from gnulib/lib/glob.c in order to fix rhbz 1982608
Also fixes swbz 25659

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit 7c477b57a3)
 2022-04-28 11:57:23 -04:00
Adhemerval Zanella
88a8637cb4 linux: Fix fchmodat with AT_SYMLINK_NOFOLLOW for 64 bit time_t (BZ#29097) 
The AT_SYMLINK_NOFOLLOW emulation ues the default 32 bit stat internal
calls, which fails with EOVERFLOW if the file constains timestamps
beyond 2038.

Checked on i686-linux-gnu.

(cherry picked from commit 118a2aee07)
 2022-04-28 10:10:30 -03:00
Carlos O'Donell
55640ed3fd i386: Regenerate ulps 
These failures were caught while building glibc master for Fedora
Rawhide which is built with '-mtune=generic -msse2 -mfpmath=sse'
using gcc 11.3 (gcc-11.3.1-2.fc35) on a Cascadelake Intel Xeon
processor.

(cherry picked from commit e465d97653)
 2022-04-27 21:20:43 -04:00
Adhemerval Zanella
9681691402 linux: Fix missing internal 64 bit time_t stat usage 
These are two missing spots initially done by 52a5fe70a2.

Checked on i686-linux-gnu.

(cherry picked from commit 834ddd0432)
 2022-04-27 14:52:26 -03:00
Noah Goldstein
c796418d00 x86: Optimize L(less_vec) case in memcmp-evex-movbe.S 
No bug.
Optimizations are twofold.

1) Replace page cross and 0/1 checks with masked load instructions in
   L(less_vec). In applications this reduces branch-misses in the
   hot [0, 32] case.
2) Change controlflow so that L(less_vec) case gets the fall through.

Change 2) helps copies in the [0, 32] size range but comes at the cost
of copies in the [33, 64] size range.  From profiles of GCC and
Python3, 94%+ and 99%+ of calls are in the [0, 32] range so this
appears to the the right tradeoff.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit abddd61de0)
 2022-04-26 18:18:16 -07:00
H.J. Lu
f3a99b2216 x86: Don't set Prefer_No_AVX512 for processors with AVX512 and AVX-VNNI 
Don't set Prefer_No_AVX512 on processors with AVX512 and AVX-VNNI since
they won't lower CPU frequency when ZMM load and store instructions are
used.

(cherry picked from commit ceeffe968c)
 2022-04-26 18:18:16 -07:00
Noah Goldstein
4bbd0f866a x86-64: Use notl in EVEX strcmp [BZ #28646] 
Must use notl %edi here as lower bits are for CHAR comparisons
potentially out of range thus can be 0 without indicating mismatch.
This fixes BZ #28646.

Co-Authored-By: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit 4df1fa6ddc)
 2022-04-26 18:18:16 -07:00
Noah Goldstein
7cb126e7e7 x86: Shrink memcmp-sse4.S code size 
No bug.

This implementation refactors memcmp-sse4.S primarily with minimizing
code size in mind. It does this by removing the lookup table logic and
removing the unrolled check from (256, 512] bytes.

memcmp-sse4 code size reduction : -3487 bytes
wmemcmp-sse4 code size reduction: -1472 bytes

The current memcmp-sse4.S implementation has a large code size
cost. This has serious adverse affects on the ICache / ITLB. While
in micro-benchmarks the implementations appears fast, traces of
real-world code have shown that the speed in micro benchmarks does not
translate when the ICache/ITLB are not primed, and that the cost
of the code size has measurable negative affects on overall
application performance.

See https://research.google/pubs/pub48320/ for more details.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit 2f9062d717)
 2022-04-26 18:18:16 -07:00
Noah Goldstein
cecbac5212 x86: Double size of ERMS rep_movsb_threshold in dl-cacheinfo.h 
No bug.

This patch doubles the rep_movsb_threshold when using ERMS. Based on
benchmarks the vector copy loop, especially now that it handles 4k
aliasing, is better for these medium ranged.

On Skylake with ERMS:

Size,   Align1, Align2, dst>src,(rep movsb) / (vec copy)
4096,   0,      0,      0,      0.975
4096,   0,      0,      1,      0.953
4096,   12,     0,      0,      0.969
4096,   12,     0,      1,      0.872
4096,   44,     0,      0,      0.979
4096,   44,     0,      1,      0.83
4096,   0,      12,     0,      1.006
4096,   0,      12,     1,      0.989
4096,   0,      44,     0,      0.739
4096,   0,      44,     1,      0.942
4096,   12,     12,     0,      1.009
4096,   12,     12,     1,      0.973
4096,   44,     44,     0,      0.791
4096,   44,     44,     1,      0.961
4096,   2048,   0,      0,      0.978
4096,   2048,   0,      1,      0.951
4096,   2060,   0,      0,      0.986
4096,   2060,   0,      1,      0.963
4096,   2048,   12,     0,      0.971
4096,   2048,   12,     1,      0.941
4096,   2060,   12,     0,      0.977
4096,   2060,   12,     1,      0.949
8192,   0,      0,      0,      0.85
8192,   0,      0,      1,      0.845
8192,   13,     0,      0,      0.937
8192,   13,     0,      1,      0.939
8192,   45,     0,      0,      0.932
8192,   45,     0,      1,      0.927
8192,   0,      13,     0,      0.621
8192,   0,      13,     1,      0.62
8192,   0,      45,     0,      0.53
8192,   0,      45,     1,      0.516
8192,   13,     13,     0,      0.664
8192,   13,     13,     1,      0.659
8192,   45,     45,     0,      0.593
8192,   45,     45,     1,      0.575
8192,   2048,   0,      0,      0.854
8192,   2048,   0,      1,      0.834
8192,   2061,   0,      0,      0.863
8192,   2061,   0,      1,      0.857
8192,   2048,   13,     0,      0.63
8192,   2048,   13,     1,      0.629
8192,   2061,   13,     0,      0.627
8192,   2061,   13,     1,      0.62

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit 475b63702e)
 2022-04-26 18:18:16 -07:00
Noah Goldstein
a7392db2ff x86: Optimize memmove-vec-unaligned-erms.S 
No bug.

The optimizations are as follows:

1) Always align entry to 64 bytes. This makes behavior more
   predictable and makes other frontend optimizations easier.

2) Make the L(more_8x_vec) cases 4k aliasing aware. This can have
   significant benefits in the case that:
        0 < (dst - src) < [256, 512]

3) Align before `rep movsb`. For ERMS this is roughly a [0, 30%]
   improvement and for FSRM [-10%, 25%].

In addition to these primary changes there is general cleanup
throughout to optimize the aligning routines and control flow logic.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit a6b7502ec0)
 2022-04-26 18:18:16 -07:00