mirror of
git://sourceware.org/git/newlib-cygwin.git
synced 2025-02-28 03:27:46 +08:00
[aarch64] Add memchr.
2014-07-11 K�vin Petit <kevin.petit@arm.com> * libc/machine/aarch64/memchr.S: New file. * libc/machine/aarch64/memchr-stub.c: New file. * libc/machine/aarch64/Makefile.am: Add the new files. * libc/machine/aarch64/Makefile.in: Regenerated.
This commit is contained in:
Richard Earnshaw
parent
96ed53c10f
commit
87375c75b3
@ -1,3 +1,10 @@
|
||||
2014-07-11 Kévin Petit <kevin.petit@arm.com>
|
||||
|
||||
* libc/machine/aarch64/memchr.S: New file.
|
||||
* libc/machine/aarch64/memchr-stub.c: New file.
|
||||
* libc/machine/aarch64/Makefile.am: Add the new files.
|
||||
* libc/machine/aarch64/Makefile.in: Regenerated.
|
||||
|
||||
2014-07-07 Pavel Pisa <pisa@cmp.felk.cvut.cz>
|
||||
Richard Earnshaw <rearnsha@arm.com>
|
||||
|
||||
|
||||
@ -9,6 +9,8 @@ AM_CCASFLAGS = $(INCLUDES)
|
||||
noinst_LIBRARIES = lib.a
|
||||
|
||||
lib_a_SOURCES =
|
||||
lib_a_SOURCES += memchr-stub.c
|
||||
lib_a_SOURCES += memchr.S
|
||||
lib_a_SOURCES += memcmp-stub.c
|
||||
lib_a_SOURCES += memcmp.S
|
||||
lib_a_SOURCES += memcpy-stub.c
|
||||
|
||||
@ -69,7 +69,8 @@ LIBRARIES = $(noinst_LIBRARIES)
|
||||
ARFLAGS = cru
|
||||
lib_a_AR = $(AR) $(ARFLAGS)
|
||||
lib_a_LIBADD =
|
||||
am_lib_a_OBJECTS = lib_a-memcmp-stub.$(OBJEXT) lib_a-memcmp.$(OBJEXT) \
|
||||
am_lib_a_OBJECTS = lib_a-memchr-stub.$(OBJEXT) lib_a-memchr.$(OBJEXT) \
|
||||
lib_a-memcmp-stub.$(OBJEXT) lib_a-memcmp.$(OBJEXT) \
|
||||
lib_a-memcpy-stub.$(OBJEXT) lib_a-memcpy.$(OBJEXT) \
|
||||
lib_a-memmove-stub.$(OBJEXT) lib_a-memmove.$(OBJEXT) \
|
||||
lib_a-memset-stub.$(OBJEXT) lib_a-memset.$(OBJEXT) \
|
||||
@ -205,11 +206,11 @@ AUTOMAKE_OPTIONS = cygnus
|
||||
INCLUDES = $(NEWLIB_CFLAGS) $(CROSS_CFLAGS) $(TARGET_CFLAGS)
|
||||
AM_CCASFLAGS = $(INCLUDES)
|
||||
noinst_LIBRARIES = lib.a
|
||||
lib_a_SOURCES = memcmp-stub.c memcmp.S memcpy-stub.c memcpy.S \
|
||||
memmove-stub.c memmove.S memset-stub.c memset.S setjmp.S \
|
||||
strchr-stub.c strchr.S strchrnul-stub.c strchrnul.S \
|
||||
strcmp-stub.c strcmp.S strlen-stub.c strlen.S strncmp-stub.c \
|
||||
strncmp.S strnlen-stub.c strnlen.S
|
||||
lib_a_SOURCES = memchr-stub.c memchr.S memcmp-stub.c memcmp.S \
|
||||
memcpy-stub.c memcpy.S memmove-stub.c memmove.S memset-stub.c \
|
||||
memset.S setjmp.S strchr-stub.c strchr.S strchrnul-stub.c \
|
||||
strchrnul.S strcmp-stub.c strcmp.S strlen-stub.c strlen.S \
|
||||
strncmp-stub.c strncmp.S strnlen-stub.c strnlen.S
|
||||
lib_a_CCASFLAGS = $(AM_CCASFLAGS)
|
||||
lib_a_CFLAGS = $(AM_CFLAGS)
|
||||
ACLOCAL_AMFLAGS = -I ../../.. -I ../../../..
|
||||
@ -272,6 +273,12 @@ distclean-compile:
|
||||
.S.obj:
|
||||
$(CPPASCOMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
|
||||
|
||||
lib_a-memchr.o: memchr.S
|
||||
$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-memchr.o `test -f 'memchr.S' || echo '$(srcdir)/'`memchr.S
|
||||
|
||||
lib_a-memchr.obj: memchr.S
|
||||
$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-memchr.obj `if test -f 'memchr.S'; then $(CYGPATH_W) 'memchr.S'; else $(CYGPATH_W) '$(srcdir)/memchr.S'; fi`
|
||||
|
||||
lib_a-memcmp.o: memcmp.S
|
||||
$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-memcmp.o `test -f 'memcmp.S' || echo '$(srcdir)/'`memcmp.S
|
||||
|
||||
@ -344,6 +351,12 @@ lib_a-strnlen.obj: strnlen.S
|
||||
.c.obj:
|
||||
$(COMPILE) -c `$(CYGPATH_W) '$<'`
|
||||
|
||||
lib_a-memchr-stub.o: memchr-stub.c
|
||||
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-memchr-stub.o `test -f 'memchr-stub.c' || echo '$(srcdir)/'`memchr-stub.c
|
||||
|
||||
lib_a-memchr-stub.obj: memchr-stub.c
|
||||
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-memchr-stub.obj `if test -f 'memchr-stub.c'; then $(CYGPATH_W) 'memchr-stub.c'; else $(CYGPATH_W) '$(srcdir)/memchr-stub.c'; fi`
|
||||
|
||||
lib_a-memcmp-stub.o: memcmp-stub.c
|
||||
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-memcmp-stub.o `test -f 'memcmp-stub.c' || echo '$(srcdir)/'`memcmp-stub.c
|
||||
|
||||
|
||||
31
newlib/libc/machine/aarch64/memchr-stub.c
Normal file
31
newlib/libc/machine/aarch64/memchr-stub.c
Normal file
@ -0,0 +1,31 @@
|
||||
/* Copyright (c) 2013, Linaro Limited
|
||||
All rights reserved.
|
||||
|
||||
Redistribution and use in source and binary forms, with or without
|
||||
modification, are permitted provided that the following conditions are met:
|
||||
* Redistributions of source code must retain the above copyright
|
||||
notice, this list of conditions and the following disclaimer.
|
||||
* Redistributions in binary form must reproduce the above copyright
|
||||
notice, this list of conditions and the following disclaimer in the
|
||||
documentation and/or other materials provided with the distribution.
|
||||
* Neither the name of the Linaro nor the
|
||||
names of its contributors may be used to endorse or promote products
|
||||
derived from this software without specific prior written permission.
|
||||
|
||||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
|
||||
|
||||
#if (defined (__OPTIMIZE_SIZE__) || defined (PREFER_SIZE_OVER_SPEED))
|
||||
# include "../../string/memchr.c"
|
||||
#else
|
||||
/* See memchr.S */
|
||||
#endif
|
||||
170
newlib/libc/machine/aarch64/memchr.S
Normal file
170
newlib/libc/machine/aarch64/memchr.S
Normal file
@ -0,0 +1,170 @@
|
||||
/*
|
||||
* memchr - find a character in a memory zone
|
||||
*
|
||||
* Copyright (c) 2014, ARM Limited
|
||||
* All rights Reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions are met:
|
||||
* * Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* * Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* * Neither the name of the company nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this
|
||||
* software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
#if (defined (__OPTIMIZE_SIZE__) || defined (PREFER_SIZE_OVER_SPEED))
|
||||
/* See memchr-stub.c */
|
||||
#else
|
||||
/* Assumptions:
|
||||
*
|
||||
* ARMv8-a, AArch64
|
||||
* Neon Available.
|
||||
*/
|
||||
|
||||
/* Arguments and results. */
|
||||
#define srcin x0
|
||||
#define chrin w1
|
||||
#define cntin x2
|
||||
|
||||
#define result x0
|
||||
|
||||
#define src x3
|
||||
#define tmp x4
|
||||
#define wtmp2 w5
|
||||
#define synd x6
|
||||
#define soff x9
|
||||
#define cntrem x10
|
||||
|
||||
#define vrepchr v0
|
||||
#define vdata1 v1
|
||||
#define vdata2 v2
|
||||
#define vhas_chr1 v3
|
||||
#define vhas_chr2 v4
|
||||
#define vrepmask v5
|
||||
#define vend v6
|
||||
|
||||
/*
|
||||
* Core algorithm:
|
||||
*
|
||||
* For each 32-byte chunk we calculate a 64-bit syndrome value, with two bits
|
||||
* per byte. For each tuple, bit 0 is set if the relevant byte matched the
|
||||
* requested character and bit 1 is not used (faster than using a 32bit
|
||||
* syndrome). Since the bits in the syndrome reflect exactly the order in which
|
||||
* things occur in the original string, counting trailing zeros allows to
|
||||
* identify exactly which byte has matched.
|
||||
*/
|
||||
|
||||
.macro def_fn f p2align=0
|
||||
.text
|
||||
.p2align \p2align
|
||||
.global \f
|
||||
.type \f, %function
|
||||
\f:
|
||||
.endm
|
||||
|
||||
def_fn memchr
|
||||
/*
|
||||
* Magic constant 0x40100401 allows us to identify which lane matches
|
||||
* the requested byte.
|
||||
*/
|
||||
mov wtmp2, #0x0401
|
||||
movk wtmp2, #0x4010, lsl #16
|
||||
dup vrepchr.16b, chrin
|
||||
/* Work with aligned 32-byte chunks */
|
||||
bic src, srcin, #31
|
||||
dup vrepmask.4s, wtmp2
|
||||
ands soff, srcin, #31
|
||||
and cntrem, cntin, #31
|
||||
b.eq .Lloop
|
||||
|
||||
/*
|
||||
* Input string is not 32-byte aligned. We calculate the syndrome
|
||||
* value for the aligned 32 bytes block containing the first bytes
|
||||
* and mask the irrelevant part.
|
||||
*/
|
||||
|
||||
ld1 {vdata1.16b, vdata2.16b}, [src], #32
|
||||
sub tmp, soff, #32
|
||||
adds cntin, cntin, tmp
|
||||
cmeq vhas_chr1.16b, vdata1.16b, vrepchr.16b
|
||||
cmeq vhas_chr2.16b, vdata2.16b, vrepchr.16b
|
||||
and vhas_chr1.16b, vhas_chr1.16b, vrepmask.16b
|
||||
and vhas_chr2.16b, vhas_chr2.16b, vrepmask.16b
|
||||
addp vend.16b, vhas_chr1.16b, vhas_chr2.16b /* 256->128 */
|
||||
addp vend.16b, vend.16b, vend.16b /* 128->64 */
|
||||
mov synd, vend.2d[0]
|
||||
/* Clear the soff*2 lower bits */
|
||||
lsl tmp, soff, #1
|
||||
lsr synd, synd, tmp
|
||||
lsl synd, synd, tmp
|
||||
/* The first block can also be the last */
|
||||
b.ls .Lmasklast
|
||||
/* Have we found something already? */
|
||||
cbnz synd, .Ltail
|
||||
|
||||
.Lloop:
|
||||
ld1 {vdata1.16b, vdata2.16b}, [src], #32
|
||||
subs cntin, cntin, #32
|
||||
cmeq vhas_chr1.16b, vdata1.16b, vrepchr.16b
|
||||
cmeq vhas_chr2.16b, vdata2.16b, vrepchr.16b
|
||||
/* If we're out of data we finish regardless of the result */
|
||||
b.ls .Lend
|
||||
/* Use a fast check for the termination condition */
|
||||
orr vend.16b, vhas_chr1.16b, vhas_chr2.16b
|
||||
addp vend.2d, vend.2d, vend.2d
|
||||
mov synd, vend.2d[0]
|
||||
/* We're not out of data, loop if we haven't found the character */
|
||||
cbz synd, .Lloop
|
||||
|
||||
.Lend:
|
||||
/* Termination condition found, let's calculate the syndrome value */
|
||||
and vhas_chr1.16b, vhas_chr1.16b, vrepmask.16b
|
||||
and vhas_chr2.16b, vhas_chr2.16b, vrepmask.16b
|
||||
addp vend.16b, vhas_chr1.16b, vhas_chr2.16b /* 256->128 */
|
||||
addp vend.16b, vend.16b, vend.16b /* 128->64 */
|
||||
mov synd, vend.2d[0]
|
||||
/* Only do the clear for the last possible block */
|
||||
b.hi .Ltail
|
||||
|
||||
.Lmasklast:
|
||||
/* Clear the (32 - ((cntrem + soff) % 32)) * 2 upper bits */
|
||||
add tmp, cntrem, soff
|
||||
and tmp, tmp, #31
|
||||
sub tmp, tmp, #32
|
||||
neg tmp, tmp, lsl #1
|
||||
lsl synd, synd, tmp
|
||||
lsr synd, synd, tmp
|
||||
|
||||
.Ltail:
|
||||
/* Count the trailing zeros using bit reversing */
|
||||
rbit synd, synd
|
||||
/* Compensate the last post-increment */
|
||||
sub src, src, #32
|
||||
/* Check that we have found a character */
|
||||
cmp synd, #0
|
||||
/* And count the leading zeros */
|
||||
clz synd, synd
|
||||
/* Compute the potential result */
|
||||
add result, src, synd, lsr #1
|
||||
/* Select result or NULL */
|
||||
csel result, xzr, result, eq
|
||||
ret
|
||||
|
||||
.size memchr, . - memchr
|
||||
#endif
|
||||
Loading…
x
Reference in New Issue
Block a user