diff options
Diffstat (limited to 'libc/string/sparc/sparc64/strcmp.S')
| -rw-r--r-- | libc/string/sparc/sparc64/strcmp.S | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/libc/string/sparc/sparc64/strcmp.S b/libc/string/sparc/sparc64/strcmp.S new file mode 100644 index 000000000..5866778d3 --- /dev/null +++ b/libc/string/sparc/sparc64/strcmp.S @@ -0,0 +1,278 @@ +/* Compare two strings for differences. + For SPARC v9. + Copyright (C) 1997, 1999, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Jan Vondrak <jvon4518@ss1000.ms.mff.cuni.cz> and + Jakub Jelinek <jj@ultra.linux.cz>. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <asm/asi.h> +#ifndef XCC + .register %g2, #scratch + .register %g3, #scratch + .register %g6, #scratch +#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(strcmp) + sethi %hi(0x01010101), %g1 /* IEU0 Group */ + andcc %o0, 7, %g0 /* IEU1 */ + bne,pn %icc, 7f /* CTI */ + or %g1, %lo(0x01010101), %g1 /* IEU0 Group */ + + andcc %o1, 7, %g3 /* IEU1 */ + bne,pn %icc, 9f /* CTI */ + sllx %g1, 32, %g2 /* IEU0 Group */ + ldx [%o0], %o2 /* Load */ + + or %g1, %g2, %g1 /* IEU0 Group */ +1: ldx [%o1], %o3 /* Load */ + sub %o1, %o0, %o1 /* IEU1 */ + sllx %g1, 7, %g2 /* IEU0 Group */ + +2: add %o0, 8, %o0 /* IEU1 */ + sub %o2, %g1, %g3 /* IEU0 Group */ + subcc %o2, %o3, %g0 /* IEU1 */ + bne,pn %xcc, 13f /* CTI */ + +#ifdef EIGHTBIT_NOT_RARE + andn %g3, %o2, %g4 /* IEU0 Group */ + ldxa [%o0] ASI_PNF, %o2 /* Load */ + andcc %g4, %g2, %g0 /* IEU1 Group */ +#else + ldxa [%o0] ASI_PNF, %o2 /* Load Group */ + andcc %g3, %g2, %g0 /* IEU1 */ +#endif + be,a,pt %xcc, 2b /* CTI */ + ldxa [%o1 + %o0] ASI_PNF, %o3 /* Load Group */ + + addcc %g3, %g1, %o4 /* IEU1 */ + srlx %g3, 32, %g3 /* IEU0 */ + andcc %g3, %g2, %g0 /* IEU1 Group */ + be,pt %xcc, 3f /* CTI */ + + srlx %o4, 56, %o5 /* IEU0 */ + andcc %o5, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4f /* CTI */ + srlx %o4, 48, %o5 /* IEU0 */ + + andcc %o5, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4f /* CTI */ + srlx %o4, 40, %o5 /* IEU0 */ + andcc %o5, 0xff, %g0 /* IEU1 Group */ + + be,pn %icc, 4f /* CTI */ + srlx %o4, 32, %o5 /* IEU0 */ + andcc %o5, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4f /* CTI */ + +3: srlx %o4, 24, %o5 /* IEU0 */ + andcc %o5, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4f /* CTI */ + srlx %o4, 16, %o5 /* IEU0 */ + + andcc %o5, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4f /* CTI */ + srlx %o4, 8, %o5 /* IEU0 */ + andcc %o5, 0xff, %g0 /* IEU1 Group */ + + be,pn %icc, 4f /* CTI */ + andcc %o4, 0xff, %g0 /* IEU1 Group */ + bne,a,pn %icc, 2b /* CTI */ + ldxa [%o1 + %o0] ASI_PNF, %o3 /* Load */ + +4: retl /* CTI+IEU1 Group */ + clr %o0 /* IEU0 */ + + .align 32 +13: mov 0xff, %g6 /* IEU0 Group */ +#ifdef EIGHTBIT_NOT_RARE + andcc %g4, %g2, %g0 /* IEU1 */ +#else + andcc %g3, %g2, %g0 /* IEU1 */ +#endif + be,pt %xcc, 25f /* CTI */ + addcc %g3, %g1, %o4 /* IEU1 Group */ + + srlx %g3, 32, %g3 /* IEU0 */ + andcc %g3, %g2, %g0 /* IEU1 Group */ + be,pt %xcc, 23f /* CTI */ + sllx %g6, 56, %o5 /* IEU0 */ + + andcc %o4, %o5, %g0 /* IEU1 Group */ + be,pn %xcc, 24f /* CTI */ + sllx %g6, 48, %o5 /* IEU0 */ + andcc %o4, %o5, %g0 /* IEU1 Group */ + + be,pn %xcc, 24f /* CTI */ + sllx %g6, 40, %o5 /* IEU0 */ + andcc %o4, %o5, %g0 /* IEU1 Group */ + be,pn %xcc, 24f /* CTI */ + + sllx %g6, 32, %o5 /* IEU0 */ + andcc %o4, %o5, %g0 /* IEU1 Group */ + be,pn %xcc, 24f /* CTI */ +23: sllx %g6, 24, %o5 /* IEU0 */ + + andcc %o4, %o5, %g0 /* IEU1 Group */ + be,pn %icc, 24f /* CTI */ + sllx %g6, 16, %o5 /* IEU0 */ + andcc %o4, %o5, %g0 /* IEU1 Group */ + + be,pn %icc, 24f /* CTI */ + sllx %g6, 8, %o5 /* IEU0 */ + andcc %o4, %o5, %g0 /* IEU1 Group */ + be,pn %icc, 24f /* CTI */ + + mov %g6, %o5 /* IEU0 */ +25: cmp %o4, %o3 /* IEU1 Group */ +5: mov -1, %o0 /* IEU0 */ + retl /* CTI+IEU1 Group */ + + movgu %xcc, 1, %o0 /* Single Group */ + + .align 16 +24: sub %o5, 1, %g6 /* IEU0 Group */ + clr %o0 /* IEU1 */ + or %o5, %g6, %o5 /* IEU0 Group */ + andn %o4, %o5, %o4 /* IEU0 Group */ + + andn %o3, %o5, %o3 /* IEU1 */ + cmp %o4, %o3 /* IEU1 Group */ + movgu %xcc, 1, %o0 /* Single Group */ + retl /* CTI+IEU1 Group */ + + movlu %xcc, -1, %o0 /* Single Group */ +6: retl /* CTI+IEU1 Group */ + mov %o4, %o0 /* IEU0 */ + + .align 16 +7: ldub [%o0], %o2 /* Load */ + add %o0, 1, %o0 /* IEU1 */ + ldub [%o1], %o3 /* Load Group */ + sllx %g1, 32, %g2 /* IEU0 */ + +8: add %o1, 1, %o1 /* IEU1 */ + subcc %o2, %o3, %o4 /* IEU1 Group */ + bne,pn %xcc, 6b /* CTI */ + lduba [%o0] ASI_PNF, %o2 /* Load */ + + brz,pn %o3, 4b /* CTI+IEU1 Group */ + lduba [%o1] ASI_PNF, %o3 /* Load */ + andcc %o0, 7, %g0 /* IEU1 Group */ + bne,a,pn %icc, 8b /* CTI */ + + add %o0, 1, %o0 /* IEU0 */ + or %g1, %g2, %g1 /* IEU0 Group */ + andcc %o1, 7, %g3 /* IEU1 */ + be,a,pn %icc, 1b /* CTI */ + + ldxa [%o0] ASI_PNF, %o2 /* Load Group */ +9: sllx %g3, 3, %g5 /* IEU0 */ + mov 64, %o5 /* IEU1 */ + sub %o1, %g3, %o1 /* IEU0 Group */ + + sub %o5, %g5, %o5 /* IEU1 */ + ldxa [%o1] ASI_PNF, %g6 /* Load Group */ + or %g1, %g2, %g1 /* IEU0 */ + sub %o1, %o0, %o1 /* IEU1 */ + + sllx %g1, 7, %g2 /* IEU0 Group */ + add %o1, 8, %o1 /* IEU1 */ + /* %g1 = 0101010101010101 + * %g2 = 8080808080800880 + * %g5 = number of bits to shift left + * %o5 = number of bits to shift right */ +10: sllx %g6, %g5, %o3 /* IEU0 Group */ + ldxa [%o1 + %o0] ASI_PNF, %g6 /* Load */ + +11: srlx %g6, %o5, %o4 /* IEU0 Group */ + ldxa [%o0] ASI_PNF, %o2 /* Load */ + or %o3, %o4, %o3 /* IEU1 */ + add %o0, 8, %o0 /* IEU0 Group */ + + subcc %o2, %o3, %g0 /* IEU1 */ +#ifdef EIGHTBIT_NOT_RARE + sub %o2, %g1, %g3 /* IEU0 Group */ + bne,pn %xcc, 13b /* CTI */ + andn %g3, %o2, %g4 /* IEU0 Group */ + + andcc %g4, %g2, %g0 /* IEU1 Group */ + be,pt %xcc, 10b /* CTI */ + srlx %g4, 32, %g4 /* IEU0 */ + andcc %g4, %g2, %g0 /* IEU1 Group */ +#else + bne,pn %xcc, 13b /* CTI */ + sub %o2, %g1, %g3 /* IEU0 Group */ + andcc %g3, %g2, %g0 /* IEU1 Group */ + + be,pt %xcc, 10b /* CTI */ + srlx %g3, 32, %g3 /* IEU0 */ + andcc %g3, %g2, %g0 /* IEU1 Group */ +#endif + be,pt %xcc, 12f /* CTI */ + + srlx %o2, 56, %g3 /* IEU0 */ + andcc %g3, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4b /* CTI */ + srlx %o2, 48, %g3 /* IEU0 */ + + andcc %g3, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4b /* CTI */ + srlx %o2, 40, %g3 /* IEU0 */ + andcc %g3, 0xff, %g0 /* IEU1 Group */ + + be,pn %icc, 4b /* CTI */ + srlx %o2, 32, %g3 /* IEU0 */ + andcc %g3, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4b /* CTI */ + +12: srlx %o2, 24, %g3 /* IEU0 */ + andcc %g3, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4b /* CTI */ + srlx %o2, 16, %g3 /* IEU0 */ + + andcc %g3, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4b /* CTI */ + srlx %o2, 8, %g3 /* IEU0 */ + andcc %g3, 0xff, %g0 /* IEU1 Group */ + + be,pn %icc, 4b /* CTI */ + andcc %o2, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4b /* CTI */ + sllx %g6, %g5, %o3 /* IEU0 */ + + ba,pt %xcc, 11b /* CTI Group */ + ldxa [%o1 + %o0] ASI_PNF, %g6 /* Load */ +END(strcmp) |