aarch64: revert optimized strchrnul.S implementation (rhbz#1167501)
This commit is contained in:
Kyle McMartin
parent
66b39fa433
commit
eb16415e7a
144
glibc-aarch64-strchrnul-revert.patch
Normal file
144
glibc-aarch64-strchrnul-revert.patch
Normal file
@ -0,0 +1,144 @@
|
||||
commit 3ec7d8a6b30659b34693730a374c0265a191c4ba
|
||||
Author: Kyle McMartin <kyle@mcmartin.ca>
|
||||
Date: Wed Dec 3 12:26:23 2014 -0500
|
||||
|
||||
Revert "[AArch64] Add optimized strchrnul."
|
||||
|
||||
This reverts commit be9d4ccc7fe62751db1a5fdcb31958561dbbda9a.
|
||||
|
||||
diff --git a/sysdeps/aarch64/strchrnul.S b/sysdeps/aarch64/strchrnul.S
|
||||
deleted file mode 100644
|
||||
index b98c2e9..0000000
|
||||
--- a/sysdeps/aarch64/strchrnul.S
|
||||
+++ /dev/null
|
||||
@@ -1,130 +0,0 @@
|
||||
-/* strchrnul - find a character or nul in a string
|
||||
-
|
||||
- Copyright (C) 2014 Free Software Foundation, Inc.
|
||||
-
|
||||
- This file is part of the GNU C Library.
|
||||
-
|
||||
- The GNU C Library is free software; you can redistribute it and/or
|
||||
- modify it under the terms of the GNU Lesser General Public
|
||||
- License as published by the Free Software Foundation; either
|
||||
- version 2.1 of the License, or (at your option) any later version.
|
||||
-
|
||||
- The GNU C Library is distributed in the hope that it will be useful,
|
||||
- but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
- Lesser General Public License for more details.
|
||||
-
|
||||
- You should have received a copy of the GNU Lesser General Public
|
||||
- License along with the GNU C Library. If not, see
|
||||
- <http://www.gnu.org/licenses/>. */
|
||||
-
|
||||
-#include <sysdep.h>
|
||||
-
|
||||
-/* Assumptions:
|
||||
- *
|
||||
- * ARMv8-a, AArch64
|
||||
- * Neon Available.
|
||||
- */
|
||||
-
|
||||
-/* Arguments and results. */
|
||||
-#define srcin x0
|
||||
-#define chrin w1
|
||||
-
|
||||
-#define result x0
|
||||
-
|
||||
-/* Locals and temporaries. */
|
||||
-
|
||||
-#define src x2
|
||||
-#define tmp1 x3
|
||||
-#define wtmp2 w4
|
||||
-#define tmp3 x5
|
||||
-
|
||||
-#define vrepchr v0
|
||||
-#define vdata1 v1
|
||||
-#define vdata2 v2
|
||||
-#define vhas_nul1 v3
|
||||
-#define vhas_nul2 v4
|
||||
-#define vhas_chr1 v5
|
||||
-#define vhas_chr2 v6
|
||||
-#define vrepmask v15
|
||||
-#define vend1 v16
|
||||
-
|
||||
-/* Core algorithm.
|
||||
-
|
||||
- For each 32-byte hunk we calculate a 64-bit syndrome value, with
|
||||
- two bits per byte (LSB is always in bits 0 and 1, for both big
|
||||
- and little-endian systems). For each tuple, bit 0 is set iff
|
||||
- the relevant byte matched the requested character or nul. Since the
|
||||
- bits in the syndrome reflect exactly the order in which things occur
|
||||
- in the original string a count_trailing_zeros() operation will
|
||||
- identify exactly which byte is causing the termination. */
|
||||
-
|
||||
-ENTRY (__strchrnul)
|
||||
- /* Magic constant 0x40100401 to allow us to identify which lane
|
||||
- matches the termination condition. */
|
||||
- mov wtmp2, #0x0401
|
||||
- movk wtmp2, #0x4010, lsl #16
|
||||
- dup vrepchr.16b, chrin
|
||||
- bic src, srcin, #31 /* Work with aligned 32-byte hunks. */
|
||||
- dup vrepmask.4s, wtmp2
|
||||
- ands tmp1, srcin, #31
|
||||
- b.eq L(loop)
|
||||
-
|
||||
- /* Input string is not 32-byte aligned. Rather than forcing
|
||||
- the padding bytes to a safe value, we calculate the syndrome
|
||||
- for all the bytes, but then mask off those bits of the
|
||||
- syndrome that are related to the padding. */
|
||||
- ld1 {vdata1.16b, vdata2.16b}, [src], #32
|
||||
- neg tmp1, tmp1
|
||||
- cmeq vhas_nul1.16b, vdata1.16b, #0
|
||||
- cmeq vhas_chr1.16b, vdata1.16b, vrepchr.16b
|
||||
- cmeq vhas_nul2.16b, vdata2.16b, #0
|
||||
- cmeq vhas_chr2.16b, vdata2.16b, vrepchr.16b
|
||||
- orr vhas_chr1.16b, vhas_chr1.16b, vhas_nul1.16b
|
||||
- orr vhas_chr2.16b, vhas_chr2.16b, vhas_nul2.16b
|
||||
- and vhas_chr1.16b, vhas_chr1.16b, vrepmask.16b
|
||||
- and vhas_chr2.16b, vhas_chr2.16b, vrepmask.16b
|
||||
- lsl tmp1, tmp1, #1
|
||||
- addp vend1.16b, vhas_chr1.16b, vhas_chr2.16b // 256->128
|
||||
- mov tmp3, #~0
|
||||
- addp vend1.16b, vend1.16b, vend1.16b // 128->64
|
||||
- lsr tmp1, tmp3, tmp1
|
||||
-
|
||||
- mov tmp3, vend1.2d[0]
|
||||
- bic tmp1, tmp3, tmp1 // Mask padding bits.
|
||||
- cbnz tmp1, L(tail)
|
||||
-
|
||||
-L(loop):
|
||||
- ld1 {vdata1.16b, vdata2.16b}, [src], #32
|
||||
- cmeq vhas_nul1.16b, vdata1.16b, #0
|
||||
- cmeq vhas_chr1.16b, vdata1.16b, vrepchr.16b
|
||||
- cmeq vhas_nul2.16b, vdata2.16b, #0
|
||||
- cmeq vhas_chr2.16b, vdata2.16b, vrepchr.16b
|
||||
- /* Use a fast check for the termination condition. */
|
||||
- orr vhas_chr1.16b, vhas_nul1.16b, vhas_chr1.16b
|
||||
- orr vhas_chr2.16b, vhas_nul2.16b, vhas_chr2.16b
|
||||
- orr vend1.16b, vhas_chr1.16b, vhas_chr2.16b
|
||||
- addp vend1.2d, vend1.2d, vend1.2d
|
||||
- mov tmp1, vend1.2d[0]
|
||||
- cbz tmp1, L(loop)
|
||||
-
|
||||
- /* Termination condition found. Now need to establish exactly why
|
||||
- we terminated. */
|
||||
- and vhas_chr1.16b, vhas_chr1.16b, vrepmask.16b
|
||||
- and vhas_chr2.16b, vhas_chr2.16b, vrepmask.16b
|
||||
- addp vend1.16b, vhas_chr1.16b, vhas_chr2.16b // 256->128
|
||||
- addp vend1.16b, vend1.16b, vend1.16b // 128->64
|
||||
-
|
||||
- mov tmp1, vend1.2d[0]
|
||||
-L(tail):
|
||||
- /* Count the trailing zeros, by bit reversing... */
|
||||
- rbit tmp1, tmp1
|
||||
- /* Re-bias source. */
|
||||
- sub src, src, #32
|
||||
- clz tmp1, tmp1 /* ... and counting the leading zeros. */
|
||||
- /* tmp1 is twice the offset into the fragment. */
|
||||
- add result, src, tmp1, lsr #1
|
||||
- ret
|
||||
-
|
||||
-END(__strchrnul)
|
||||
-weak_alias (__strchrnul, strchrnul)
|
||||
@ -1,6 +1,6 @@
|
||||
%define glibcsrcdir glibc-2.20-276-g0e7e69b
|
||||
%define glibcversion 2.20.90
|
||||
%define glibcrelease 10%{?dist}
|
||||
%define glibcrelease 11%{?dist}
|
||||
# Pre-release tarballs are pulled in from git using a command that is
|
||||
# effectively:
|
||||
#
|
||||
@ -237,6 +237,7 @@ Patch2031: %{name}-rh1070416.patch
|
||||
|
||||
Patch2033: %{name}-aarch64-tls-fixes.patch
|
||||
Patch2034: %{name}-aarch64-workaround-nzcv-clobber-in-tlsdesc.patch
|
||||
Patch2035: %{name}-aarch64-strchrnul-revert.patch
|
||||
|
||||
##############################################################################
|
||||
# End of glibc patches.
|
||||
@ -569,6 +570,7 @@ package or when debugging this package.
|
||||
%patch0047 -p1
|
||||
%patch2033 -p1
|
||||
%patch2034 -p1
|
||||
%patch2035 -p1
|
||||
%patch0050 -p1
|
||||
%patch0052 -p1
|
||||
%patch0053 -p1
|
||||
@ -1725,6 +1727,10 @@ rm -f *.filelist*
|
||||
%endif
|
||||
|
||||
%changelog
|
||||
* Wed Dec 03 2014 Kyle McMartin <kyle@fedoraproject.org> - 2.20.90-11
|
||||
- aarch64: revert optimized strchrnul.S implementation (rhbz#1167501)
|
||||
until it can be debugged.
|
||||
|
||||
* Fri Nov 28 2014 Carlos O'Donell <carlos@redhat.com> - 2.20.90-10
|
||||
- Auto-sync with upstream master.
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user