diff options
Diffstat (limited to 'sysdeps/sparc/sparc64/rawmemchr.S')
| -rw-r--r-- | sysdeps/sparc/sparc64/rawmemchr.S | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/sysdeps/sparc/sparc64/rawmemchr.S b/sysdeps/sparc/sparc64/rawmemchr.S new file mode 100644 index 0000000000..8f48ed940a --- /dev/null +++ b/sysdeps/sparc/sparc64/rawmemchr.S @@ -0,0 +1,178 @@ +/* rawmemchr (str, ch) -- Return pointer to first occurrence of CH in STR. + For SPARC v9. + Copyright (C) 1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Jakub Jelinek <jj@ultra.linux.cz>. + + This version is developed using the same algorithm as the fast C + version which carries the following introduction: + + Based on strlen implementation by Torbjorn Granlund (tege@sics.se), + with help from Dan Sahlin (dan@sics.se) and + commentary by Jim Blandy (jimb@ai.mit.edu); + adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu), + and implemented by Roland McGrath (roland@ai.mit.edu). + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <sysdep.h> +#include <asm/asi.h> +#ifndef XCC +#define XCC xcc +#define USE_BPR +#endif + + /* Normally, this uses + ((xword - 0x0101010101010101) & 0x8080808080808080) test + to find out if any byte in xword could be zero. This is fast, but + also gives false alarm for any byte in range 0x81-0xff. It does + not matter for correctness, as if this test tells us there could + be some zero byte, we check it byte by byte, but if bytes with + high bits set are common in the strings, then this will give poor + performance. You can #define EIGHTBIT_NOT_RARE and the algorithm + will use one tick slower, but more precise test + ((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080), + which does not give any false alarms (but if some bits are set, + one cannot assume from it which bytes are zero and which are not). + It is yet to be measured, what is the correct default for glibc + in these days for an average user. + */ + + .text + .align 32 +ENTRY(__rawmemchr) + and %o1, 0xff, %o1 /* IEU0 Group */ + sethi %hi(0x01010101), %g1 /* IEU1 */ + ldub [%o0], %o3 /* Load */ + sll %o1, 8, %o4 /* IEU0 Group */ + + or %g1, %lo(0x01010101), %g1 /* IEU1 */ + sllx %g1, 32, %g2 /* IEU0 Group */ + or %o4, %o1, %o4 /* IEU1 */ + andcc %o0, 7, %g0 /* IEU1 Group */ + + sll %o4, 16, %g5 /* IEU0 */ + or %o4, %g5, %o4 /* IEU0 Group */ + or %g1, %g2, %g1 /* IEU1 */ + bne,pn %icc, 32f /* CTI */ + + sllx %o4, 32, %g5 /* IEU0 Group */ + cmp %o3, %o1 /* IEU1 */ + be,pn %icc, 30f /* CTI */ + sllx %g1, 7, %g2 /* IEU0 Group */ + +18: ldx [%o0], %o3 /* Load */ + or %o4, %g5, %o4 /* IEU1 */ + add %o0, 8, %o0 /* IEU0 Group */ +19: xor %o3, %o4, %o3 /* IEU0 Group */ + + sub %o3, %g1, %o2 /* IEU0 Group */ +#ifdef EIGHTBIT_NOT_RARE + andn %o2, %o3, %g7 /* IEU0 Group */ + ldxa [%o0] ASI_PNF, %o3 /* Load */ + andcc %g7, %g2, %g0 /* IEU1 Group */ +#else + ldxa [%o0] ASI_PNF, %o3 /* Load */ + andcc %o2, %g2, %g0 /* IEU1 Group */ +#endif + be,pt %xcc, 19b /* CTI */ + + add %o0, 8, %o0 /* IEU0 */ + addcc %o2, %g1, %g3 /* IEU1 Group */ + srlx %o2, 32, %o2 /* IEU0 */ +20: andcc %o2, %g2, %g0 /* IEU1 Group */ + + be,pn %xcc, 21f /* CTI */ + srlx %g3, 56, %o2 /* IEU0 */ + andcc %o2, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 29f /* CTI */ + + srlx %g3, 48, %o2 /* IEU0 */ + andcc %o2, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 28f /* CTI */ + srlx %g3, 40, %o2 /* IEU0 */ + + andcc %o2, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 27f /* CTI */ + srlx %g3, 32, %o2 /* IEU0 */ + andcc %o2, 0xff, %g0 /* IEU1 Group */ + + be,pn %icc, 26f /* CTI */ +21: srlx %g3, 24, %o2 /* IEU0 */ + andcc %o2, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 25f /* CTI */ + + srlx %g3, 16, %o2 /* IEU0 */ + andcc %o2, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 24f /* CTI */ + srlx %g3, 8, %o2 /* IEU0 */ + + andcc %o2, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 23f /* CTI */ + xor %o3, %o4, %o3 /* IEU0 */ + andcc %g3, 0xff, %g0 /* IEU1 Group */ + + be,pn %icc, 22f /* CTI */ + sub %o3, %g1, %o2 /* IEU0 */ + ldxa [%o0] ASI_PNF, %o3 /* Load */ + andcc %o2, %g2, %g0 /* IEU1 Group */ + + be,pt %xcc, 19b /* CTI */ + add %o0, 8, %o0 /* IEU0 */ + addcc %o2, %g1, %g3 /* IEU1 Group */ + ba,pt %xcc, 20b /* CTI */ + + srlx %o2, 32, %o2 /* IEU0 */ + + .align 16 +22: retl /* CTI+IEU1 Group */ + add %o0, -9, %o0 /* IEU0 */ +23: retl /* CTI+IEU1 Group */ + add %o0, -10, %o0 /* IEU0 */ + +24: retl /* CTI+IEU1 Group */ + add %o0, -11, %o0 /* IEU0 */ +25: retl /* CTI+IEU1 Group */ + add %o0, -12, %o0 /* IEU0 */ + +26: retl /* CTI+IEU1 Group */ + add %o0, -13, %o0 /* IEU0 */ +27: retl /* CTI+IEU1 Group */ + add %o0, -14, %o0 /* IEU0 */ + +28: retl /* CTI+IEU1 Group */ + add %o0, -15, %o0 /* IEU0 */ +29: retl /* CTI+IEU1 Group */ + add %o0, -16, %o0 /* IEU0 */ + +30: retl /* CTI+IEU1 Group */ + nop /* IEU0 */ + + .align 16 +32: andcc %o0, 7, %g0 /* IEU1 Group */ + be,a,pn %icc, 18b /* CTI */ + sllx %g1, 7, %g2 /* IEU0 */ + add %o0, 1, %o0 /* IEU0 Group */ + + cmp %o3, %o1 /* IEU1 */ + bne,a,pt %icc, 32b /* CTI */ + lduba [%o0] ASI_PNF, %o3 /* Load */ + retl /* CTI+IEU1 Group */ + + add %o0, -1, %o0 /* IEU0 */ +END(__rawmemchr) + +weak_alias (__rawmemchr, rawmemchr) |