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2008-04-01 Patrick Mansfield <patmans@us.ibm.com>

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* libc/machine/spu/memcmp.c: New file for SPU optimized memcmp.
        * libc/machine/spu/strncmp.h: New file supply _strncmp_internal.
        * libc/machine/spu/Makefile.am: Add memcmp.c.
        * libc/machine/spu/Makefile.in: Rebuild.
        * libc/machine/spu/strncmp.c: Use _strncmp_internal.
This commit is contained in:
Jeff Johnston 2008-04-01 19:02:16 +00:00
parent 71f3a8f566
commit bd6e30d59a
6 changed files with 257 additions and 128 deletions
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8
newlib/ChangeLog
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@ -1,3 +1,11 @@
2008-04-01 Patrick Mansfield <patmans@us.ibm.com>
* libc/machine/spu/memcmp.c: New file for SPU optimized memcmp.
* libc/machine/spu/strncmp.h: New file supply _strncmp_internal.
* libc/machine/spu/Makefile.am: Add memcmp.c.
* libc/machine/spu/Makefile.in: Rebuild.
* libc/machine/spu/strncmp.c: Use _strncmp_internal.
2008-04-01 Patrick Mansfield <patmans@us.ibm.com> 2008-04-01 Patrick Mansfield <patmans@us.ibm.com>
* configure.host: Build SPU with -DREENTRANT_SYSCALLS_PROVIDED and * configure.host: Build SPU with -DREENTRANT_SYSCALLS_PROVIDED and

8
newlib/libc/machine/spu/Makefile.am
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@ -12,9 +12,9 @@ lib_a_SOURCES = setjmp.S assert.c clearerr.c creat.c fclose.c feof.c \
ferror.c fflush.c fgetc.c fgetpos.c fgets.c fileno.c fiprintf.S \ ferror.c fflush.c fgetc.c fgetpos.c fgets.c fileno.c fiprintf.S \
fiscanf.S fopen.c fprintf.S fputc.c fputs.c fread.c freopen.c \ fiscanf.S fopen.c fprintf.S fputc.c fputs.c fread.c freopen.c \
fscanf.S fseek.c fsetpos.c ftell.c fwrite.c getc.c getchar.c \ fscanf.S fseek.c fsetpos.c ftell.c fwrite.c getc.c getchar.c \
gets.c iprintf.S iscanf.S memcpy.c memmove.c memset.c perror.c \ gets.c iprintf.S iscanf.S memcmp.c memcpy.c memmove.c memset.c \
printf.S putc.c putchar.c puts.c remove.c rename.c rewind.c \ perror.c printf.S putc.c putchar.c puts.c remove.c rename.c \
scanf.S setbuf.c setvbuf.c siprintf.S siscanf.S sleep.c \ rewind.c scanf.S setbuf.c setvbuf.c siprintf.S siscanf.S sleep.c \
sniprintf.S snprintf.S sprintf.S sscanf.S stdio.c strcat.c \ sniprintf.S snprintf.S sprintf.S sscanf.S stdio.c strcat.c \
strchr.c strcmp.c strcpy.c strcspn.c strlen.c strncat.c strncmp.c \ strchr.c strcmp.c strcpy.c strcspn.c strlen.c strncat.c strncmp.c \
strncpy.c strpbrk.c strrchr.c strspn.c strxfrm.c tmpfile.c \ strncpy.c strpbrk.c strrchr.c strspn.c strxfrm.c tmpfile.c \
@ -26,6 +26,6 @@ lib_a_SOURCES = setjmp.S assert.c clearerr.c creat.c fclose.c feof.c \
lib_a_CCASFLAGS = $(AM_CCASFLAGS) lib_a_CCASFLAGS = $(AM_CCASFLAGS)
lib_a_CFLAGS = $(AM_CFLAGS) lib_a_CFLAGS = $(AM_CFLAGS)
ACLOCAL_AMFLAGS = -I ../../.. -I ../../../.. ACLOCAL_AMFLAGS = -I ../../.. -I ../../../..
CONFIG_STATUS_DEPENDENCIES = $(newlib_basedir)/configure.host CONFIG_STATUS_DEPENDENCIES = $(newlib_basedir)/configure.host

72
newlib/libc/machine/spu/Makefile.in
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@ -73,7 +73,8 @@ DIST_COMMON = $(srcdir)/../../../../config.guess \
$(srcdir)/../../../../compile $(srcdir)/../../../../compile \ $(srcdir)/../../../../compile $(srcdir)/../../../../compile \
$(srcdir)/../../../../compile $(srcdir)/../../../../compile \ $(srcdir)/../../../../compile $(srcdir)/../../../../compile \
$(srcdir)/../../../../compile $(srcdir)/../../../../compile \ $(srcdir)/../../../../compile $(srcdir)/../../../../compile \
$(srcdir)/../../../../compile $(srcdir)/../../../../compile $(srcdir)/../../../../compile $(srcdir)/../../../../compile \
$(srcdir)/../../../../compile
subdir = . subdir = .
ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
am__aclocal_m4_deps = $(top_srcdir)/../../../acinclude.m4 \ am__aclocal_m4_deps = $(top_srcdir)/../../../acinclude.m4 \
@ -103,33 +104,34 @@ am_lib_a_OBJECTS = lib_a-setjmp.$(OBJEXT) lib_a-assert.$(OBJEXT) \
lib_a-fwrite.$(OBJEXT) lib_a-getc.$(OBJEXT) \ lib_a-fwrite.$(OBJEXT) lib_a-getc.$(OBJEXT) \
lib_a-getchar.$(OBJEXT) lib_a-gets.$(OBJEXT) \ lib_a-getchar.$(OBJEXT) lib_a-gets.$(OBJEXT) \
lib_a-iprintf.$(OBJEXT) lib_a-iscanf.$(OBJEXT) \ lib_a-iprintf.$(OBJEXT) lib_a-iscanf.$(OBJEXT) \
lib_a-memcpy.$(OBJEXT) lib_a-memmove.$(OBJEXT) \ lib_a-memcmp.$(OBJEXT) lib_a-memcpy.$(OBJEXT) \
lib_a-memset.$(OBJEXT) lib_a-perror.$(OBJEXT) \ lib_a-memmove.$(OBJEXT) lib_a-memset.$(OBJEXT) \
lib_a-printf.$(OBJEXT) lib_a-putc.$(OBJEXT) \ lib_a-perror.$(OBJEXT) lib_a-printf.$(OBJEXT) \
lib_a-putchar.$(OBJEXT) lib_a-puts.$(OBJEXT) \ lib_a-putc.$(OBJEXT) lib_a-putchar.$(OBJEXT) \
lib_a-remove.$(OBJEXT) lib_a-rename.$(OBJEXT) \ lib_a-puts.$(OBJEXT) lib_a-remove.$(OBJEXT) \
lib_a-rewind.$(OBJEXT) lib_a-scanf.$(OBJEXT) \ lib_a-rename.$(OBJEXT) lib_a-rewind.$(OBJEXT) \
lib_a-setbuf.$(OBJEXT) lib_a-setvbuf.$(OBJEXT) \ lib_a-scanf.$(OBJEXT) lib_a-setbuf.$(OBJEXT) \
lib_a-siprintf.$(OBJEXT) lib_a-siscanf.$(OBJEXT) \ lib_a-setvbuf.$(OBJEXT) lib_a-siprintf.$(OBJEXT) \
lib_a-sleep.$(OBJEXT) lib_a-sniprintf.$(OBJEXT) \ lib_a-siscanf.$(OBJEXT) lib_a-sleep.$(OBJEXT) \
lib_a-snprintf.$(OBJEXT) lib_a-sprintf.$(OBJEXT) \ lib_a-sniprintf.$(OBJEXT) lib_a-snprintf.$(OBJEXT) \
lib_a-sscanf.$(OBJEXT) lib_a-stdio.$(OBJEXT) \ lib_a-sprintf.$(OBJEXT) lib_a-sscanf.$(OBJEXT) \
lib_a-strcat.$(OBJEXT) lib_a-strchr.$(OBJEXT) \ lib_a-stdio.$(OBJEXT) lib_a-strcat.$(OBJEXT) \
lib_a-strcmp.$(OBJEXT) lib_a-strcpy.$(OBJEXT) \ lib_a-strchr.$(OBJEXT) lib_a-strcmp.$(OBJEXT) \
lib_a-strcspn.$(OBJEXT) lib_a-strlen.$(OBJEXT) \ lib_a-strcpy.$(OBJEXT) lib_a-strcspn.$(OBJEXT) \
lib_a-strncat.$(OBJEXT) lib_a-strncmp.$(OBJEXT) \ lib_a-strlen.$(OBJEXT) lib_a-strncat.$(OBJEXT) \
lib_a-strncpy.$(OBJEXT) lib_a-strpbrk.$(OBJEXT) \ lib_a-strncmp.$(OBJEXT) lib_a-strncpy.$(OBJEXT) \
lib_a-strrchr.$(OBJEXT) lib_a-strspn.$(OBJEXT) \ lib_a-strpbrk.$(OBJEXT) lib_a-strrchr.$(OBJEXT) \
lib_a-strxfrm.$(OBJEXT) lib_a-tmpfile.$(OBJEXT) \ lib_a-strspn.$(OBJEXT) lib_a-strxfrm.$(OBJEXT) \
lib_a-tmpnam.$(OBJEXT) lib_a-ungetc.$(OBJEXT) \ lib_a-tmpfile.$(OBJEXT) lib_a-tmpnam.$(OBJEXT) \
lib_a-usleep.$(OBJEXT) lib_a-vfiprintf.$(OBJEXT) \ lib_a-ungetc.$(OBJEXT) lib_a-usleep.$(OBJEXT) \
lib_a-vfiscanf.$(OBJEXT) lib_a-vfprintf.$(OBJEXT) \ lib_a-vfiprintf.$(OBJEXT) lib_a-vfiscanf.$(OBJEXT) \
lib_a-vfscanf.$(OBJEXT) lib_a-viprintf.$(OBJEXT) \ lib_a-vfprintf.$(OBJEXT) lib_a-vfscanf.$(OBJEXT) \
lib_a-viscanf.$(OBJEXT) lib_a-vprintf.$(OBJEXT) \ lib_a-viprintf.$(OBJEXT) lib_a-viscanf.$(OBJEXT) \
lib_a-vscanf.$(OBJEXT) lib_a-vsiprintf.$(OBJEXT) \ lib_a-vprintf.$(OBJEXT) lib_a-vscanf.$(OBJEXT) \
lib_a-vsiscanf.$(OBJEXT) lib_a-vsniprintf.$(OBJEXT) \ lib_a-vsiprintf.$(OBJEXT) lib_a-vsiscanf.$(OBJEXT) \
lib_a-vsnprintf.$(OBJEXT) lib_a-vsprintf.$(OBJEXT) \ lib_a-vsniprintf.$(OBJEXT) lib_a-vsnprintf.$(OBJEXT) \
lib_a-vsscanf.$(OBJEXT) lib_a-stack_reg_va.$(OBJEXT) lib_a-vsprintf.$(OBJEXT) lib_a-vsscanf.$(OBJEXT) \
lib_a-stack_reg_va.$(OBJEXT)
lib_a_OBJECTS = $(am_lib_a_OBJECTS) lib_a_OBJECTS = $(am_lib_a_OBJECTS)
DEFAULT_INCLUDES = -I. -I$(srcdir) DEFAULT_INCLUDES = -I. -I$(srcdir)
depcomp = depcomp =
@ -260,9 +262,9 @@ lib_a_SOURCES = setjmp.S assert.c clearerr.c creat.c fclose.c feof.c \
ferror.c fflush.c fgetc.c fgetpos.c fgets.c fileno.c fiprintf.S \ ferror.c fflush.c fgetc.c fgetpos.c fgets.c fileno.c fiprintf.S \
fiscanf.S fopen.c fprintf.S fputc.c fputs.c fread.c freopen.c \ fiscanf.S fopen.c fprintf.S fputc.c fputs.c fread.c freopen.c \
fscanf.S fseek.c fsetpos.c ftell.c fwrite.c getc.c getchar.c \ fscanf.S fseek.c fsetpos.c ftell.c fwrite.c getc.c getchar.c \
gets.c iprintf.S iscanf.S memcpy.c memmove.c memset.c perror.c \ gets.c iprintf.S iscanf.S memcmp.c memcpy.c memmove.c memset.c \
printf.S putc.c putchar.c puts.c remove.c rename.c rewind.c \ perror.c printf.S putc.c putchar.c puts.c remove.c rename.c \
scanf.S setbuf.c setvbuf.c siprintf.S siscanf.S sleep.c \ rewind.c scanf.S setbuf.c setvbuf.c siprintf.S siscanf.S sleep.c \
sniprintf.S snprintf.S sprintf.S sscanf.S stdio.c strcat.c \ sniprintf.S snprintf.S sprintf.S sscanf.S stdio.c strcat.c \
strchr.c strcmp.c strcpy.c strcspn.c strlen.c strncat.c strncmp.c \ strchr.c strcmp.c strcpy.c strcspn.c strlen.c strncat.c strncmp.c \
strncpy.c strpbrk.c strrchr.c strspn.c strxfrm.c tmpfile.c \ strncpy.c strpbrk.c strrchr.c strspn.c strxfrm.c tmpfile.c \
@ -273,7 +275,7 @@ lib_a_SOURCES = setjmp.S assert.c clearerr.c creat.c fclose.c feof.c \
lib_a_CCASFLAGS = $(AM_CCASFLAGS) lib_a_CCASFLAGS = $(AM_CCASFLAGS)
lib_a_CFLAGS = $(AM_CFLAGS) lib_a_CFLAGS = $(AM_CFLAGS)
ACLOCAL_AMFLAGS = -I ../../.. -I ../../../.. ACLOCAL_AMFLAGS = -I ../../.. -I ../../../..
CONFIG_STATUS_DEPENDENCIES = $(newlib_basedir)/configure.host CONFIG_STATUS_DEPENDENCIES = $(newlib_basedir)/configure.host
all: all-am all: all-am
@ -572,6 +574,12 @@ lib_a-gets.o: gets.c
lib_a-gets.obj: gets.c lib_a-gets.obj: gets.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-gets.obj `if test -f 'gets.c'; then $(CYGPATH_W) 'gets.c'; else $(CYGPATH_W) '$(srcdir)/gets.c'; fi` $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-gets.obj `if test -f 'gets.c'; then $(CYGPATH_W) 'gets.c'; else $(CYGPATH_W) '$(srcdir)/gets.c'; fi`
lib_a-memcmp.o: memcmp.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-memcmp.o `test -f 'memcmp.c' || echo '$(srcdir)/'`memcmp.c
lib_a-memcmp.obj: memcmp.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-memcmp.obj `if test -f 'memcmp.c'; then $(CYGPATH_W) 'memcmp.c'; else $(CYGPATH_W) '$(srcdir)/memcmp.c'; fi`
lib_a-memcpy.o: memcpy.c lib_a-memcpy.o: memcpy.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-memcpy.o `test -f 'memcpy.c' || echo '$(srcdir)/'`memcpy.c $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-memcpy.o `test -f 'memcpy.c' || echo '$(srcdir)/'`memcpy.c

43
newlib/libc/machine/spu/memcmp.c Normal file
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@ -0,0 +1,43 @@
/*
(C) Copyright 2008
International Business Machines Corporation
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 names of the copyright holders nor the names of their
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 OWNER
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.
*/
#include <stddef.h>
#include "strncmp.h"
/*
* Compare the two strings s1 and s2 of length n. Returns an integer less
* than, equal to, or greater than zero if s1 is found, respectively,
* to be less than, to match, or be greater than s2.
*/
int memcmp(const void *s1, const void *s2, size_t n)
{
vec_uint4 end_v;
return _strncmp_internal (s1, s2, n, &end_v, 0 /* no zero check */);
}

99
newlib/libc/machine/spu/strncmp.c
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@ -30,102 +30,17 @@
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. POSSIBILITY OF SUCH DAMAGE.
*/ */
#include <spu_intrinsics.h>
#include <stddef.h> #include <stddef.h>
#include "vec_literal.h" #include <spu_intrinsics.h>
#include "strncmp.h"
/* Compare the two strings s1 and s2 of length n. Returns an integer /*
* less than, equal to, or greater than zero if s1 is found, respectively, * Compare the two strings s1 and s2 of length n. Returns an integer less
* than, equal to, or greater than zero if s1 is found, respectively,
* to be less than, to match, or be greater than s2. * to be less than, to match, or be greater than s2.
*/ */
int strncmp(const char *s1, const char *s2, size_t n) int strncmp(const char *s1, const char *s2, size_t n)
{ {
unsigned int offset1, offset2; vec_uint4 end_v;
vec_int4 n_v; return _strncmp_internal (s1, s2, n, &end_v, 1);
vec_uint4 cnt1_v, cnt2_v, max_cnt_v;
vec_uint4 gt_v, lt_v, mask_v, end1_v, end2_v, end_v, neq_v;
vec_uint4 shift_n_v, shift_eos_v, max_shift_v;
vec_uchar16 shuffle1, shuffle2;
vec_uchar16 data1A, data1B, data1, data2A, data2B, data2;
vec_uchar16 *ptr1, *ptr2;
data1 = data2 = spu_splats((unsigned char)0);
ptr1 = (vec_uchar16 *)s1;
ptr2 = (vec_uchar16 *)s2;
offset1 = (unsigned int)(ptr1) & 15;
offset2 = (unsigned int)(ptr2) & 15;
shuffle1 = (vec_uchar16)spu_add((vec_uint4)spu_splats((unsigned char)offset1),
VEC_LITERAL(vec_uint4, 0x00010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F));
shuffle2 = (vec_uchar16)spu_add((vec_uint4)spu_splats((unsigned char)offset2),
VEC_LITERAL(vec_uint4, 0x00010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F));
data1A = *ptr1++;
data2A = *ptr2++;
n_v = spu_promote((int)n, 0);
do {
data1B = *ptr1++;
data2B = *ptr2++;
/* Quadword align each of the input strings so that
* we operate on full quadwords.
*/
data1 = spu_shuffle(data1A, data1B, shuffle1);
data2 = spu_shuffle(data2A, data2B, shuffle2);
data1A = data1B;
data2A = data2B;
neq_v = spu_gather(spu_xor(spu_cmpeq(data1, data2), -1));
end1_v = spu_gather(spu_cmpeq(data1, 0));
end2_v = spu_gather(spu_cmpeq(data2, 0));
end_v = spu_or(end1_v, end2_v), 0;
n_v = spu_add(n_v, -16);
/* Repeat until either
* 1) the character count expired,
* 2) a null character is discovered in one of the input strings, or
* 3) the strings do not compare equal.
*/
} while (spu_extract(spu_and(spu_cmpeq(spu_or(end_v, neq_v), 0), spu_cmpgt(n_v, 0)), 0));
/* Construct a mask to eliminate characters that are not of interest
* in the comparison. Theses include characters that are beyond the
* n character count and beyond the first null character.
*/
cnt1_v = spu_cntlz(end1_v);
cnt2_v = spu_cntlz(end2_v);
max_cnt_v = spu_sel(cnt1_v, cnt2_v, spu_cmpgt(cnt2_v, cnt1_v));
mask_v = spu_splats((unsigned int)0xFFFF);
shift_n_v = spu_andc((__vector unsigned int)spu_sub(0, n_v), spu_cmpgt(n_v, -1));
shift_eos_v = spu_sub(32, max_cnt_v);
max_shift_v = spu_sel(shift_n_v, shift_eos_v, spu_cmpgt(shift_eos_v, shift_n_v));
mask_v = spu_and(spu_sl(mask_v, spu_extract(max_shift_v, 0)), mask_v);
/* Determine if greater then or less then in the case that they are
* not equal. gt_v is either 1 (in the case s1 is greater then s2), or
* -1 (in the case that s2 is greater then s1).
*/
gt_v = spu_gather(spu_cmpgt(data1, data2));
lt_v = spu_gather(spu_cmpgt(data2, data1));
gt_v = spu_sub(-1, spu_sl(spu_cmpgt(gt_v, lt_v), 1));
/* Construct a mask to be applied to gt_v if the strings are discovered
* to be equal.
*/
mask_v = spu_cmpeq(spu_and(neq_v, mask_v), 0);
return (spu_extract(spu_andc(gt_v, mask_v), 0));
} }

155
newlib/libc/machine/spu/strncmp.h Normal file
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@ -0,0 +1,155 @@
/*
(C) Copyright 2001,2006,2008
International Business Machines Corporation,
Sony Computer Entertainment, Incorporated,
Toshiba Corporation,
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 names of the copyright holders nor the names of their
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 OWNER 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.
*/
#include <spu_intrinsics.h>
#include <stddef.h>
/*
* Internal _strncmp_internal for strncmp and memcmp:
*
* Compare the two strings s1 and s2 of length n. Returns an integer less
* than, equal to, or greater than zero if s1 is found, respectively,
* to be less than, to match, or be greater than s2. Check for zero bytes
* only if check_zeroes is set. In additin, the vector value *end_v will
* contain all zeroes if we hit a NUL character that caused the comparison
* to complete, *end_v is modified only if check_zeroes is set.
*/
static inline int
_strncmp_internal(const char *s1, const char *s2, size_t n, vec_uint4
*end_v, int check_zeroes)
{
unsigned int offset1, offset2;
vec_int4 n_v;
vec_uint4 cnt1_v, cnt2_v, max_cnt_v;
vec_uint4 gt_v, lt_v, mask_v, end1_v, end2_v, neq_v, tmp1_v;
vec_uint4 shift_n_v, shift_eos_v, max_shift_v;
vec_uchar16 shuffle1, shuffle2;
vec_uchar16 data1A, data1B, data1, data2A, data2B, data2;
vec_uchar16 *ptr1, *ptr2;
data1 = data2 = spu_splats((unsigned char)0);
ptr1 = (vec_uchar16 *)s1;
ptr2 = (vec_uchar16 *)s2;
offset1 = (unsigned int)(ptr1) & 15;
offset2 = (unsigned int)(ptr2) & 15;
shuffle1 = (vec_uchar16)
spu_add((vec_uint4)spu_splats((unsigned char)offset1),
((vec_uint4) {0x00010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F}));
shuffle2 = (vec_uchar16)
spu_add((vec_uint4)spu_splats((unsigned char)offset2),
((vec_uint4) {0x00010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F}));
data1A = *ptr1++;
data2A = *ptr2++;
n_v = spu_promote((int)n, 0);
do {
data1B = *ptr1++;
data2B = *ptr2++;
/*
* Quadword align each of the input strings so that we operate on full
* quadwords.
*/
data1 = spu_shuffle(data1A, data1B, shuffle1);
data2 = spu_shuffle(data2A, data2B, shuffle2);
data1A = data1B;
data2A = data2B;
neq_v = spu_gather(spu_xor(spu_cmpeq(data1, data2), -1));
if (check_zeroes) {
end1_v = spu_gather(spu_cmpeq(data1, 0));
end2_v = spu_gather(spu_cmpeq(data2, 0));
*end_v = spu_or(end1_v, end2_v);
}
n_v = spu_add(n_v, -16);
/*
* Repeat until either
* 1) the character count expired
* 2) check_zeroes is set and a null character is discovered in one of
* the input strings
* 3) the strings do not compare equal
*/
if (check_zeroes) {
tmp1_v = spu_or(*end_v, neq_v);
tmp1_v = spu_cmpeq(tmp1_v, 0);
} else {
tmp1_v = spu_cmpeq(neq_v, 0);
}
tmp1_v = spu_and(tmp1_v, spu_cmpgt(n_v, 0));
} while (spu_extract(tmp1_v, 0));
/*
* Construct a mask to eliminate characters that are not of interest
* in the comparison.
*/
mask_v = spu_splats((unsigned int)0xFFFF);
shift_n_v =
spu_andc((__vector unsigned int)spu_sub(0, n_v), spu_cmpgt(n_v, -1));
if (check_zeroes) {
cnt1_v = spu_cntlz(end1_v);
cnt2_v = spu_cntlz(end2_v);
max_cnt_v = spu_sel(cnt1_v, cnt2_v, spu_cmpgt(cnt2_v, cnt1_v));
shift_eos_v = spu_sub(32, max_cnt_v);
max_shift_v =
spu_sel(shift_n_v, shift_eos_v, spu_cmpgt(shift_eos_v, shift_n_v));
mask_v = spu_and(spu_sl(mask_v, spu_extract(max_shift_v, 0)), mask_v);
} else {
mask_v = spu_and(spu_sl(mask_v, spu_extract(shift_n_v, 0)), mask_v);
}
/*
* Determine if greater then or less then in the case that they are
* not equal. gt_v is either 1 (in the case s1 is greater then s2), or
* -1 (in the case that s2 is greater then s1).
*
* There are no byte vector math instructions, so we can't subtract
* data1 from data2.
*/
gt_v = spu_gather(spu_cmpgt(data1, data2));
lt_v = spu_gather(spu_cmpgt(data2, data1));
gt_v = spu_sub(-1, spu_sl(spu_cmpgt(gt_v, lt_v), 1));
/*
* Construct a mask to be applied to gt_v if the strings are discovered
* to be equal.
*/
mask_v = spu_cmpeq(spu_and(neq_v, mask_v), 0);
return (spu_extract(spu_andc(gt_v, mask_v), 0));
}