2013-01-10 Marcus Shawcroft <marcus.shawcroft@linaro.org>
* libc/machine/aarch64/Makefile.am (lib_a_SOURCES): Add
memcmp-stub.c and memcmp.S
* libc/machine/aarch64/Makefile.in: Regenerated.
* libc/machine/aarch64/memcmp-stub.c: New file.
* libc/machine/aarch64/memcmp.S: New file.
This commit is contained in:
Marcus Shawcroft
parent
ba8f05bcf5
commit
211f1ec717
|
|
@ -1,3 +1,11 @@
|
|||
2013-01-10 Marcus Shawcroft <marcus.shawcroft@linaro.org>
|
||||
|
||||
* libc/machine/aarch64/Makefile.am (lib_a_SOURCES): Add
|
||||
memcmp-stub.c and memcmp.S
|
||||
* libc/machine/aarch64/Makefile.in: Regenerated.
|
||||
* libc/machine/aarch64/memcmp-stub.c: New file.
|
||||
* libc/machine/aarch64/memcmp.S: New file.
|
||||
|
||||
2013-01-10 Marcus Shawcroft <marcus.shawcroft@linaro.org>
|
||||
|
||||
* libc/machine/aarch64/Makefile.am (lib_a_SOURCES): Add
|
||||
|
|
|
|||
|
|
@ -9,6 +9,8 @@ AM_CCASFLAGS = $(INCLUDES)
|
|||
noinst_LIBRARIES = lib.a
|
||||
|
||||
lib_a_SOURCES =
|
||||
lib_a_SOURCES += memcmp-stub.c
|
||||
lib_a_SOURCES += memcmp.S
|
||||
lib_a_SOURCES += memcpy-stub.c
|
||||
lib_a_SOURCES += memcpy.S
|
||||
lib_a_SOURCES += memmove-stub.c
|
||||
|
|
|
|||
|
|
@ -69,7 +69,8 @@ LIBRARIES = $(noinst_LIBRARIES)
|
|||
ARFLAGS = cru
|
||||
lib_a_AR = $(AR) $(ARFLAGS)
|
||||
lib_a_LIBADD =
|
||||
am_lib_a_OBJECTS = lib_a-memcpy-stub.$(OBJEXT) lib_a-memcpy.$(OBJEXT) \
|
||||
am_lib_a_OBJECTS = lib_a-memcmp-stub.$(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) \
|
||||
|
|
@ -202,10 +203,10 @@ AUTOMAKE_OPTIONS = cygnus
|
|||
INCLUDES = $(NEWLIB_CFLAGS) $(CROSS_CFLAGS) $(TARGET_CFLAGS)
|
||||
AM_CCASFLAGS = $(INCLUDES)
|
||||
noinst_LIBRARIES = lib.a
|
||||
lib_a_SOURCES = 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
|
||||
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
|
||||
lib_a_CCASFLAGS = $(AM_CCASFLAGS)
|
||||
lib_a_CFLAGS = $(AM_CFLAGS)
|
||||
ACLOCAL_AMFLAGS = -I ../../.. -I ../../../..
|
||||
|
|
@ -268,6 +269,12 @@ distclean-compile:
|
|||
.S.obj:
|
||||
$(CPPASCOMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
|
||||
|
||||
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
|
||||
|
||||
lib_a-memcmp.obj: memcmp.S
|
||||
$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-memcmp.obj `if test -f 'memcmp.S'; then $(CYGPATH_W) 'memcmp.S'; else $(CYGPATH_W) '$(srcdir)/memcmp.S'; fi`
|
||||
|
||||
lib_a-memcpy.o: memcpy.S
|
||||
$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-memcpy.o `test -f 'memcpy.S' || echo '$(srcdir)/'`memcpy.S
|
||||
|
||||
|
|
@ -322,6 +329,12 @@ lib_a-strnlen.obj: strnlen.S
|
|||
.c.obj:
|
||||
$(COMPILE) -c `$(CYGPATH_W) '$<'`
|
||||
|
||||
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
|
||||
|
||||
lib_a-memcmp-stub.obj: memcmp-stub.c
|
||||
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-memcmp-stub.obj `if test -f 'memcmp-stub.c'; then $(CYGPATH_W) 'memcmp-stub.c'; else $(CYGPATH_W) '$(srcdir)/memcmp-stub.c'; fi`
|
||||
|
||||
lib_a-memcpy-stub.o: memcpy-stub.c
|
||||
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-memcpy-stub.o `test -f 'memcpy-stub.c' || echo '$(srcdir)/'`memcpy-stub.c
|
||||
|
||||
|
|
|
|||
|
|
@ -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/memcmp.c"
|
||||
#else
|
||||
/* See memcmp.S */
|
||||
#endif
|
||||
|
|
@ -0,0 +1,167 @@
|
|||
/* memcmp - compare memory
|
||||
|
||||
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))
|
||||
/* See memcmp-stub.c */
|
||||
#else
|
||||
/* Assumptions:
|
||||
*
|
||||
* ARMv8-a, AArch64
|
||||
*/
|
||||
|
||||
.macro def_fn f p2align=0
|
||||
.text
|
||||
.p2align \p2align
|
||||
.global \f
|
||||
.type \f, %function
|
||||
\f:
|
||||
.endm
|
||||
|
||||
/* Parameters and result. */
|
||||
#define src1 x0
|
||||
#define src2 x1
|
||||
#define limit x2
|
||||
#define result x0
|
||||
|
||||
/* Internal variables. */
|
||||
#define data1 x3
|
||||
#define data1w w3
|
||||
#define data2 x4
|
||||
#define data2w w4
|
||||
#define has_nul x5
|
||||
#define diff x6
|
||||
#define endloop x7
|
||||
#define tmp1 x8
|
||||
#define tmp2 x9
|
||||
#define tmp3 x10
|
||||
#define pos x11
|
||||
#define limit_wd x12
|
||||
#define mask x13
|
||||
|
||||
def_fn memcmp p2align=6
|
||||
cbz limit, .Lret0
|
||||
eor tmp1, src1, src2
|
||||
tst tmp1, #7
|
||||
b.ne .Lmisaligned8
|
||||
ands tmp1, src1, #7
|
||||
b.ne .Lmutual_align
|
||||
add limit_wd, limit, #7
|
||||
lsr limit_wd, limit_wd, #3
|
||||
/* Start of performance-critical section -- one 64B cache line. */
|
||||
.Lloop_aligned:
|
||||
ldr data1, [src1], #8
|
||||
ldr data2, [src2], #8
|
||||
.Lstart_realigned:
|
||||
subs limit_wd, limit_wd, #1
|
||||
eor diff, data1, data2 /* Non-zero if differences found. */
|
||||
csinv endloop, diff, xzr, ne /* Last Dword or differences. */
|
||||
cbz endloop, .Lloop_aligned
|
||||
/* End of performance-critical section -- one 64B cache line. */
|
||||
|
||||
/* Not reached the limit, must have found a diff. */
|
||||
cbnz limit_wd, .Lnot_limit
|
||||
|
||||
/* Limit % 8 == 0 => all bytes significant. */
|
||||
ands limit, limit, #7
|
||||
b.eq .Lnot_limit
|
||||
|
||||
lsl limit, limit, #3 /* Bits -> bytes. */
|
||||
mov mask, #~0
|
||||
#ifdef __AARCH64EB__
|
||||
lsr mask, mask, limit
|
||||
#else
|
||||
lsl mask, mask, limit
|
||||
#endif
|
||||
bic data1, data1, mask
|
||||
bic data2, data2, mask
|
||||
|
||||
orr diff, diff, mask
|
||||
.Lnot_limit:
|
||||
|
||||
#ifndef __AARCH64EB__
|
||||
rev diff, diff
|
||||
rev data1, data1
|
||||
rev data2, data2
|
||||
#endif
|
||||
/* The MS-non-zero bit of DIFF marks either the first bit
|
||||
that is different, or the end of the significant data.
|
||||
Shifting left now will bring the critical information into the
|
||||
top bits. */
|
||||
clz pos, diff
|
||||
lsl data1, data1, pos
|
||||
lsl data2, data2, pos
|
||||
/* But we need to zero-extend (char is unsigned) the value and then
|
||||
perform a signed 32-bit subtraction. */
|
||||
lsr data1, data1, #56
|
||||
sub result, data1, data2, lsr #56
|
||||
ret
|
||||
|
||||
.Lmutual_align:
|
||||
/* Sources are mutually aligned, but are not currently at an
|
||||
alignment boundary. Round down the addresses and then mask off
|
||||
the bytes that precede the start point. */
|
||||
bic src1, src1, #7
|
||||
bic src2, src2, #7
|
||||
add limit, limit, tmp1 /* Adjust the limit for the extra. */
|
||||
lsl tmp1, tmp1, #3 /* Bytes beyond alignment -> bits. */
|
||||
ldr data1, [src1], #8
|
||||
neg tmp1, tmp1 /* Bits to alignment -64. */
|
||||
ldr data2, [src2], #8
|
||||
mov tmp2, #~0
|
||||
#ifdef __AARCH64EB__
|
||||
/* Big-endian. Early bytes are at MSB. */
|
||||
lsl tmp2, tmp2, tmp1 /* Shift (tmp1 & 63). */
|
||||
#else
|
||||
/* Little-endian. Early bytes are at LSB. */
|
||||
lsr tmp2, tmp2, tmp1 /* Shift (tmp1 & 63). */
|
||||
#endif
|
||||
add limit_wd, limit, #7
|
||||
orr data1, data1, tmp2
|
||||
orr data2, data2, tmp2
|
||||
lsr limit_wd, limit_wd, #3
|
||||
b .Lstart_realigned
|
||||
|
||||
.Lret0:
|
||||
mov result, #0
|
||||
ret
|
||||
|
||||
.p2align 6
|
||||
.Lmisaligned8:
|
||||
sub limit, limit, #1
|
||||
1:
|
||||
/* Perhaps we can do better than this. */
|
||||
ldrb data1w, [src1], #1
|
||||
ldrb data2w, [src2], #1
|
||||
subs limit, limit, #1
|
||||
ccmp data1w, data2w, #0, cs /* NZCV = 0b0000. */
|
||||
b.eq 1b
|
||||
sub result, data1, data2
|
||||
ret
|
||||
.size memcmp, . - memcmp
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue