* libc/machine/aarch64/strchr.S: New file
* libc/machine/aarch64/strchr-stub.c: New file * libc/machine/aarch64/Makefile.am: Add them to build list. * libc/machine/aarch64/Makefile.in: Regenerated.
This commit is contained in:
Richard Earnshaw
parent
d043b4c527
commit
5efd066df2
|
|
@ -1,3 +1,10 @@
|
|||
2014-06-10 Richard Earnshaw <rearnsha@arm.com>
|
||||
|
||||
* libc/machine/aarch64/strchr.S: New file
|
||||
* libc/machine/aarch64/strchr-stub.c: New file
|
||||
* libc/machine/aarch64/Makefile.am: Add them to build list.
|
||||
* libc/machine/aarch64/Makefile.in: Regenerated.
|
||||
|
||||
2014-06-09 DJ Delorie <dj@redhat.com>
|
||||
|
||||
* configure.host (default_newlib_nano_malloc): New.
|
||||
|
|
|
|||
|
|
@ -18,6 +18,8 @@ lib_a_SOURCES += memmove.S
|
|||
lib_a_SOURCES += memset-stub.c
|
||||
lib_a_SOURCES += memset.S
|
||||
lib_a_SOURCES += setjmp.S
|
||||
lib_a_SOURCES += strchr-stub.c
|
||||
lib_a_SOURCES += strchr.S
|
||||
lib_a_SOURCES += strcmp-stub.c
|
||||
lib_a_SOURCES += strcmp.S
|
||||
lib_a_SOURCES += strlen-stub.c
|
||||
|
|
|
|||
|
|
@ -73,7 +73,8 @@ am_lib_a_OBJECTS = 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) \
|
||||
lib_a-setjmp.$(OBJEXT) lib_a-strcmp-stub.$(OBJEXT) \
|
||||
lib_a-setjmp.$(OBJEXT) lib_a-strchr-stub.$(OBJEXT) \
|
||||
lib_a-strchr.$(OBJEXT) lib_a-strcmp-stub.$(OBJEXT) \
|
||||
lib_a-strcmp.$(OBJEXT) lib_a-strlen-stub.$(OBJEXT) \
|
||||
lib_a-strlen.$(OBJEXT) lib_a-strncmp-stub.$(OBJEXT) \
|
||||
lib_a-strncmp.$(OBJEXT) lib_a-strnlen-stub.$(OBJEXT) \
|
||||
|
|
@ -205,8 +206,8 @@ 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 \
|
||||
strcmp-stub.c strcmp.S strlen-stub.c strlen.S strncmp-stub.c \
|
||||
strncmp.S strnlen-stub.c strnlen.S
|
||||
strchr-stub.c strchr.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 ../../../..
|
||||
|
|
@ -299,6 +300,12 @@ lib_a-setjmp.o: setjmp.S
|
|||
lib_a-setjmp.obj: setjmp.S
|
||||
$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-setjmp.obj `if test -f 'setjmp.S'; then $(CYGPATH_W) 'setjmp.S'; else $(CYGPATH_W) '$(srcdir)/setjmp.S'; fi`
|
||||
|
||||
lib_a-strchr.o: strchr.S
|
||||
$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-strchr.o `test -f 'strchr.S' || echo '$(srcdir)/'`strchr.S
|
||||
|
||||
lib_a-strchr.obj: strchr.S
|
||||
$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-strchr.obj `if test -f 'strchr.S'; then $(CYGPATH_W) 'strchr.S'; else $(CYGPATH_W) '$(srcdir)/strchr.S'; fi`
|
||||
|
||||
lib_a-strcmp.o: strcmp.S
|
||||
$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-strcmp.o `test -f 'strcmp.S' || echo '$(srcdir)/'`strcmp.S
|
||||
|
||||
|
|
@ -353,6 +360,12 @@ lib_a-memset-stub.o: memset-stub.c
|
|||
lib_a-memset-stub.obj: memset-stub.c
|
||||
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-memset-stub.obj `if test -f 'memset-stub.c'; then $(CYGPATH_W) 'memset-stub.c'; else $(CYGPATH_W) '$(srcdir)/memset-stub.c'; fi`
|
||||
|
||||
lib_a-strchr-stub.o: strchr-stub.c
|
||||
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-strchr-stub.o `test -f 'strchr-stub.c' || echo '$(srcdir)/'`strchr-stub.c
|
||||
|
||||
lib_a-strchr-stub.obj: strchr-stub.c
|
||||
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-strchr-stub.obj `if test -f 'strchr-stub.c'; then $(CYGPATH_W) 'strchr-stub.c'; else $(CYGPATH_W) '$(srcdir)/strchr-stub.c'; fi`
|
||||
|
||||
lib_a-strcmp-stub.o: strcmp-stub.c
|
||||
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-strcmp-stub.o `test -f 'strcmp-stub.c' || echo '$(srcdir)/'`strcmp-stub.c
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,31 @@
|
|||
/* 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))
|
||||
# include "../../string/strchr.c"
|
||||
#else
|
||||
/* See strchr.S */
|
||||
#endif
|
||||
|
|
@ -0,0 +1,164 @@
|
|||
/*
|
||||
strchr - find a character in a string
|
||||
|
||||
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 strchr-stub.c */
|
||||
#else
|
||||
|
||||
/* Assumptions:
|
||||
*
|
||||
* ARMv8-a, AArch64
|
||||
* Neon Available.
|
||||
*/
|
||||
|
||||
/* Arguments and results. */
|
||||
#define srcin x0
|
||||
#define chrin w1
|
||||
|
||||
#define result x0
|
||||
|
||||
#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_0 v7
|
||||
#define vrepmask_c v16
|
||||
#define vend1 v17
|
||||
#define vend2 v18
|
||||
|
||||
/* 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; bit 1 is set
|
||||
iff the relevant byte matched the NUL end of string (we trigger
|
||||
off bit0 for the special case of looking for 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, and why. */
|
||||
|
||||
/* Locals and temporaries. */
|
||||
|
||||
.macro def_fn f p2align=0
|
||||
.text
|
||||
.p2align \p2align
|
||||
.global \f
|
||||
.type \f, %function
|
||||
\f:
|
||||
.endm
|
||||
|
||||
def_fn strchr
|
||||
/* Magic constant 0x40100401 to allow us to identify which lane
|
||||
matches the requested byte. Magic constant 0x80200802 used
|
||||
similarly for NUL termination. */
|
||||
mov wtmp2, #0x0401
|
||||
movk wtmp2, #0x4010, lsl #16
|
||||
dup vrepchr.16b, chrin
|
||||
bic src, srcin, #31 /* Work with aligned 32-byte hunks. */
|
||||
dup vrepmask_c.4s, wtmp2
|
||||
ands tmp1, srcin, #31
|
||||
add vrepmask_0.4s, vrepmask_c.4s, vrepmask_c.4s /* equiv: lsl #1 */
|
||||
b.eq .Lloop
|
||||
|
||||
/* 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
|
||||
and vhas_nul1.16b, vhas_nul1.16b, vrepmask_0.16b
|
||||
and vhas_nul2.16b, vhas_nul2.16b, vrepmask_0.16b
|
||||
and vhas_chr1.16b, vhas_chr1.16b, vrepmask_c.16b
|
||||
and vhas_chr2.16b, vhas_chr2.16b, vrepmask_c.16b
|
||||
orr vend1.16b, vhas_nul1.16b, vhas_chr1.16b
|
||||
orr vend2.16b, vhas_nul2.16b, vhas_chr2.16b
|
||||
lsl tmp1, tmp1, #1
|
||||
addp vend1.16b, vend1.16b, vend2.16b // 256->128
|
||||
mov tmp3, #~0
|
||||
addp vend1.16b, vend1.16b, vend2.16b // 128->64
|
||||
lsr tmp1, tmp3, tmp1
|
||||
|
||||
mov tmp3, vend1.2d[0]
|
||||
bic tmp1, tmp3, tmp1 // Mask padding bits.
|
||||
cbnz tmp1, .Ltail
|
||||
|
||||
.Lloop:
|
||||
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 vend1.16b, vhas_nul1.16b, vhas_chr1.16b
|
||||
orr vend2.16b, vhas_nul2.16b, vhas_chr2.16b
|
||||
orr vend1.16b, vend1.16b, vend2.16b
|
||||
addp vend1.2d, vend1.2d, vend1.2d
|
||||
mov tmp1, vend1.2d[0]
|
||||
cbz tmp1, .Lloop
|
||||
|
||||
/* Termination condition found. Now need to establish exactly why
|
||||
we terminated. */
|
||||
and vhas_nul1.16b, vhas_nul1.16b, vrepmask_0.16b
|
||||
and vhas_nul2.16b, vhas_nul2.16b, vrepmask_0.16b
|
||||
and vhas_chr1.16b, vhas_chr1.16b, vrepmask_c.16b
|
||||
and vhas_chr2.16b, vhas_chr2.16b, vrepmask_c.16b
|
||||
orr vend1.16b, vhas_nul1.16b, vhas_chr1.16b
|
||||
orr vend2.16b, vhas_nul2.16b, vhas_chr2.16b
|
||||
addp vend1.16b, vend1.16b, vend2.16b // 256->128
|
||||
addp vend1.16b, vend1.16b, vend2.16b // 128->64
|
||||
|
||||
mov tmp1, vend1.2d[0]
|
||||
.Ltail:
|
||||
/* 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 even if the target charager was found first. Otherwise
|
||||
we've found the end of string and we weren't looking for NUL. */
|
||||
tst tmp1, #1
|
||||
add result, src, tmp1, lsr #1
|
||||
csel result, result, xzr, eq
|
||||
ret
|
||||
|
||||
.size strchr, . - strchr
|
||||
#endif
|
||||
Loading…
Reference in New Issue