| /* Compare no more than N characters of S1 and S2, returning less than, |
| equal to or greater than zero if S1 is lexicographically less than, |
| equal to or greater than S2. |
| 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 <sysdep.h> |
| #include <asm/asi.h> |
| #ifndef XCC |
| #define XCC xcc |
| #define USE_BPR |
| .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(strncmp) |
| #ifdef USE_BPR |
| brz,pn %o2, 4f /* CTI+IEU1 Group */ |
| #else |
| tst %o2 /* IEU1 Group */ |
| be,pn %XCC, 4f /* CTI */ |
| #endif |
| sethi %hi(0x1010101), %g1 /* IEU0 */ |
| andcc %o0, 7, %g0 /* IEU1 Group */ |
| bne,pn %icc, 9f /* CTI */ |
| |
| or %g1, %lo(0x1010101), %g1 /* IEU0 */ |
| andcc %o1, 7, %g3 /* IEU1 Group */ |
| bne,pn %icc, 11f /* CTI */ |
| sllx %g1, 32, %g2 /* IEU0 */ |
| |
| ldx [%o0], %g4 /* Load Group */ |
| or %g1, %g2, %g1 /* IEU0 */ |
| 1: ldx [%o1], %o3 /* Load Group */ |
| sllx %g1, 7, %g2 /* IEU0 */ |
| |
| add %o0, 8, %o0 /* IEU1 */ |
| 2: subcc %o2, 8, %o2 /* IEU1 Group */ |
| bl,pn %XCC, 5f /* CTI */ |
| add %o1, 8, %o1 /* IEU0 */ |
| |
| sub %g4, %g1, %g3 /* IEU0 Group */ |
| subcc %g4, %o3, %o4 /* IEU1 */ |
| #ifdef EIGHTBIT_NOT_RARE |
| andn %g3, %g4, %g6 /* IEU0 Group */ |
| #endif |
| bne,pn %xcc, 6f /* CTI */ |
| ldxa [%o0] ASI_PNF, %g4 /* Load Group */ |
| |
| add %o0, 8, %o0 /* IEU0 */ |
| #ifdef EIGHTBIT_NOT_RARE |
| andcc %g6, %g2, %g0 /* IEU1 */ |
| #else |
| andcc %g3, %g2, %g0 /* IEU1 */ |
| #endif |
| be,a,pt %xcc, 2b /* CTI */ |
| ldxa [%o1] ASI_PNF, %o3 /* Load Group */ |
| |
| addcc %g3, %g1, %o4 /* IEU1 */ |
| #ifdef EIGHTBIT_NOT_RARE |
| srlx %g6, 32, %g6 /* IEU0 */ |
| andcc %g6, %g2, %g0 /* IEU1 Group */ |
| #else |
| srlx %g3, 32, %g3 /* IEU0 */ |
| andcc %g3, %g2, %g0 /* IEU1 Group */ |
| #endif |
| 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] ASI_PNF, %o3 /* Load */ |
| |
| 4: retl /* CTI+IEU1 Group */ |
| clr %o0 /* IEU0 */ |
| |
| .align 16 |
| 5: srlx %g4, 56, %o4 /* IEU0 Group */ |
| cmp %o2, -8 /* IEU1 */ |
| be,pn %XCC, 4b /* CTI */ |
| srlx %o3, 56, %o5 /* IEU0 Group */ |
| |
| andcc %o4, 0xff, %g0 /* IEU1 */ |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| bne,pn %xcc, 8f /* CTI */ |
| |
| srlx %o3, 48, %o5 /* IEU0 */ |
| cmp %o2, -7 /* IEU1 Group */ |
| be,pn %XCC, 4b /* CTI */ |
| srlx %g4, 48, %o4 /* IEU0 */ |
| |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| bne,pn %xcc, 8f /* CTI */ |
| |
| srlx %o3, 40, %o5 /* IEU0 */ |
| cmp %o2, -6 /* IEU1 Group */ |
| be,pn %XCC, 4b /* CTI */ |
| srlx %g4, 40, %o4 /* IEU0 */ |
| |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| bne,pn %xcc, 8f /* CTI */ |
| |
| srlx %o3, 32, %o5 /* IEU0 */ |
| cmp %o2, -5 /* IEU1 Group */ |
| be,pn %XCC, 4b /* CTI */ |
| srlx %g4, 32, %o4 /* IEU0 */ |
| |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| bne,pn %xcc, 8f /* CTI */ |
| |
| srlx %o3, 24, %o5 /* IEU0 */ |
| cmp %o2, -4 /* IEU1 Group */ |
| be,pn %XCC, 4b /* CTI */ |
| srlx %g4, 24, %o4 /* IEU0 */ |
| |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| bne,pn %xcc, 8f /* CTI */ |
| |
| srlx %o3, 16, %o5 /* IEU0 */ |
| cmp %o2, -3 /* IEU1 Group */ |
| be,pn %XCC, 4b /* CTI */ |
| srlx %g4, 16, %o4 /* IEU0 */ |
| |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| bne,pn %xcc, 8f /* CTI */ |
| |
| srlx %o3, 8, %o5 /* IEU0 */ |
| cmp %o2, -2 /* IEU1 Group */ |
| be,pn %XCC, 4b /* CTI */ |
| srlx %g4, 8, %o4 /* IEU0 */ |
| |
| retl /* CTI+IEU1 Group */ |
| sub %o4, %o5, %o0 /* IEU0 */ |
| 6: addcc %o3, %o4, %g4 /* IEU1 */ |
| 7: srlx %o3, 56, %o5 /* IEU0 */ |
| |
| srlx %g4, 56, %o4 /* IEU0 Group */ |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| |
| bne,pn %xcc, 8f /* CTI */ |
| srlx %o3, 48, %o5 /* IEU0 */ |
| srlx %g4, 48, %o4 /* IEU0 Group */ |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| bne,pn %xcc, 8f /* CTI */ |
| srlx %o3, 40, %o5 /* IEU0 */ |
| |
| srlx %g4, 40, %o4 /* IEU0 Group */ |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| |
| bne,pn %xcc, 8f /* CTI */ |
| srlx %o3, 32, %o5 /* IEU0 */ |
| srlx %g4, 32, %o4 /* IEU0 Group */ |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| bne,pn %xcc, 8f /* CTI */ |
| srlx %o3, 24, %o5 /* IEU0 */ |
| |
| srlx %g4, 24, %o4 /* IEU0 Group */ |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| |
| bne,pn %xcc, 8f /* CTI */ |
| srlx %o3, 16, %o5 /* IEU0 */ |
| srlx %g4, 16, %o4 /* IEU0 Group */ |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| bne,pn %xcc, 8f /* CTI */ |
| srlx %o3, 8, %o5 /* IEU0 */ |
| |
| srlx %g4, 8, %o4 /* IEU0 Group */ |
| andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| be,pn %xcc, 8f /* CTI */ |
| subcc %o4, %o5, %o4 /* IEU1 Group */ |
| |
| retl /* CTI+IEU1 Group */ |
| sub %g4, %o3, %o0 /* IEU0 */ |
| 8: retl /* CTI+IEU1 Group */ |
| mov %o4, %o0 /* IEU0 */ |
| |
| 9: ldub [%o0], %g4 /* Load Group */ |
| add %o0, 1, %o0 /* IEU0 */ |
| ldub [%o1], %o3 /* Load Group */ |
| sllx %g1, 32, %g2 /* IEU0 */ |
| |
| 10: subcc %o2, 1, %o2 /* IEU1 Group */ |
| be,pn %XCC, 8b /* CTI */ |
| sub %g4, %o3, %o4 /* IEU0 */ |
| add %o1, 1, %o1 /* IEU0 Group */ |
| |
| cmp %g4, %o3 /* IEU1 */ |
| bne,pn %xcc, 8b /* CTI */ |
| lduba [%o0] ASI_PNF, %g4 /* Load Group */ |
| andcc %o3, 0xff, %g0 /* IEU1 */ |
| |
| be,pn %icc, 4b /* CTI */ |
| lduba [%o1] ASI_PNF, %o3 /* Load Group */ |
| andcc %o0, 7, %g0 /* IEU1 */ |
| bne,a,pn %icc, 10b /* CTI */ |
| |
| add %o0, 1, %o0 /* IEU0 Group */ |
| or %g1, %g2, %g1 /* IEU1 */ |
| andcc %o1, 7, %g3 /* IEU1 Group */ |
| be,pn %icc, 1b /* CTI */ |
| |
| ldxa [%o0] ASI_PNF, %g4 /* Load */ |
| 11: sllx %g3, 3, %g5 /* IEU0 Group */ |
| mov 64, %g6 /* IEU1 */ |
| or %g1, %g2, %g1 /* IEU0 Group */ |
| sub %o1, %g3, %o1 /* IEU1 */ |
| |
| sub %g6, %g5, %g6 /* IEU0 Group */ |
| ldxa [%o1] ASI_PNF, %o4 /* Load */ |
| sllx %g1, 7, %g2 /* IEU1 */ |
| add %o1, 8, %o1 /* IEU0 Group */ |
| /* %g1 = 0101010101010101 |
| %g2 = 8080808080808080 |
| %g3 = %o1 alignment |
| %g5 = number of bits to shift left |
| %g6 = number of bits to shift right */ |
| |
| 12: sllx %o4, %g5, %o3 /* IEU0 Group */ |
| ldxa [%o1] ASI_PNF, %o4 /* Load */ |
| add %o1, 8, %o1 /* IEU1 */ |
| 13: ldxa [%o0] ASI_PNF, %g4 /* Load Group */ |
| |
| addcc %o0, 8, %o0 /* IEU1 */ |
| srlx %o4, %g6, %o5 /* IEU0 */ |
| subcc %o2, 8, %o2 /* IEU1 Group */ |
| bl,pn %XCC, 5b /* CTI */ |
| |
| or %o3, %o5, %o3 /* IEU0 */ |
| cmp %g4, %o3 /* IEU1 Group */ |
| bne,pn %xcc, 7b /* CTI */ |
| sub %g4, %g1, %o5 /* IEU0 */ |
| |
| #ifdef EIGHTBIT_NOT_RARE |
| andn %o5, %g4, %o5 /* IEU0 Group */ |
| #endif |
| andcc %o5, %g2, %g0 /* IEU1 Group */ |
| be,pt %xcc, 12b /* CTI */ |
| srlx %o5, 32, %o5 /* IEU0 */ |
| andcc %o5, %g2, %g0 /* IEU1 Group */ |
| |
| be,pt %xcc, 14f /* CTI */ |
| srlx %g4, 56, %o5 /* IEU0 */ |
| andcc %o5, 0xff, %g0 /* IEU1 Group */ |
| be,pn %icc, 4b /* CTI */ |
| |
| srlx %g4, 48, %o5 /* IEU0 */ |
| andcc %o5, 0xff, %g0 /* IEU1 Group */ |
| be,pn %icc, 4b /* CTI */ |
| srlx %g4, 40, %o5 /* IEU0 */ |
| |
| andcc %o5, 0xff, %g0 /* IEU1 Group */ |
| be,pn %icc, 4b /* CTI */ |
| srlx %g4, 32, %o5 /* IEU0 */ |
| andcc %o5, 0xff, %g0 /* IEU1 Group */ |
| |
| be,pn %icc, 4b /* CTI */ |
| 14: srlx %g4, 24, %o5 /* IEU0 */ |
| andcc %o5, 0xff, %g0 /* IEU1 Group */ |
| be,pn %icc, 4b /* CTI */ |
| |
| srlx %g4, 16, %o5 /* IEU0 */ |
| andcc %o5, 0xff, %g0 /* IEU1 Group */ |
| be,pn %icc, 4b /* CTI */ |
| srlx %g4, 8, %o5 /* IEU0 */ |
| |
| andcc %o5, 0xff, %g0 /* IEU1 Group */ |
| be,pn %icc, 4b /* CTI */ |
| andcc %g4, 0xff, %g0 /* IEU1 Group */ |
| be,pn %icc, 4b /* CTI */ |
| |
| sllx %o4, %g5, %o3 /* IEU0 */ |
| ldxa [%o1] ASI_PNF, %o4 /* Load Group */ |
| ba,pt %xcc, 13b /* CTI */ |
| add %o1, 8, %o1 /* IEU0 */ |
| END(strncmp) |
| libc_hidden_builtin_def (strncmp) |
