diff options
Diffstat (limited to 'sysdeps/sparc/sparc64/strcpy.S')
| -rw-r--r-- | sysdeps/sparc/sparc64/strcpy.S | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/sysdeps/sparc/sparc64/strcpy.S b/sysdeps/sparc/sparc64/strcpy.S new file mode 100644 index 0000000000..773caf5656 --- /dev/null +++ b/sysdeps/sparc/sparc64/strcpy.S @@ -0,0 +1,239 @@ +/* Copy SRC to DEST returning DEST. + For SPARC v9. + Copyright (C) 1998, 1999 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 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> + + /* 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(strcpy) + sethi %hi(0x01010101), %g1 /* IEU0 Group */ + mov %o0, %g7 /* IEU1 */ + or %g1, %lo(0x01010101), %g1 /* IEU0 Group */ + andcc %o0, 7, %g0 /* IEU1 */ + + sllx %g1, 32, %g2 /* IEU0 Group */ + bne,pn %icc, 12f /* CTI */ + andcc %o1, 7, %g3 /* IEU1 */ + or %g1, %g2, %g1 /* IEU0 Group */ + + bne,pn %icc, 14f /* CTI */ + sllx %g1, 7, %g2 /* IEU0 Group */ +1: ldx [%o1], %o3 /* Load */ + add %o1, 8, %o1 /* IEU1 */ + +2: mov %o3, %g3 /* IEU0 Group */ +3: sub %o3, %g1, %o2 /* IEU1 */ + ldxa [%o1] ASI_PNF, %o3 /* Load */ +#ifdef EIGHTBIT_NOT_RARE + andn %o2, %g3, %o2 /* IEU0 Group */ +#endif + add %o0, 8, %o0 /* IEU0 Group */ + + andcc %o2, %g2, %g0 /* IEU1 */ + add %o1, 8, %o1 /* IEU0 Group */ + be,a,pt %xcc, 2b /* CTI */ + stx %g3, [%o0 - 8] /* Store */ + + srlx %g3, 56, %g5 /* IEU0 Group */ + andcc %g5, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 11f /* CTI */ + srlx %g3, 48, %g4 /* IEU0 */ + + andcc %g4, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 10f /* CTI */ + srlx %g3, 40, %g5 /* IEU0 */ + andcc %g5, 0xff, %g0 /* IEU1 Group */ + + be,pn %icc, 9f /* CTI */ + srlx %g3, 32, %g4 /* IEU0 */ + andcc %g4, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 8f /* CTI */ + + srlx %g3, 24, %g5 /* IEU0 */ + andcc %g5, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 7f /* CTI */ + srlx %g3, 16, %g4 /* IEU0 */ + + andcc %g4, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 6f /* CTI */ + srlx %g3, 8, %g5 /* IEU0 */ + andcc %g5, 0xff, %g0 /* IEU1 Group */ + + be,pn %icc, 5f /* CTI */ + sub %o3, %g1, %o2 /* IEU0 */ + stx %g3, [%o0 - 8] /* Store Group */ + andcc %g3, 0xff, %g0 /* IEU1 */ + + bne,pt %icc, 3b /* CTI */ + mov %o3, %g3 /* IEU0 Group */ +4: retl /* CTI+IEU1 Group */ + mov %g7, %o0 /* IEU0 */ + + .align 16 +5: stb %g5, [%o0 - 2] /* Store Group */ + srlx %g3, 16, %g4 /* IEU0 */ +6: sth %g4, [%o0 - 4] /* Store Group */ + srlx %g3, 32, %g4 /* IEU0 */ + + stw %g4, [%o0 - 8] /* Store Group */ + retl /* CTI+IEU1 Group */ + mov %g7, %o0 /* IEU0 */ +7: stb %g5, [%o0 - 4] /* Store Group */ + + srlx %g3, 32, %g4 /* IEU0 */ +8: stw %g4, [%o0 - 8] /* Store Group */ + retl /* CTI+IEU1 Group */ + mov %g7, %o0 /* IEU0 */ + +9: stb %g5, [%o0 - 6] /* Store Group */ + srlx %g3, 48, %g4 /* IEU0 */ +10: sth %g4, [%o0 - 8] /* Store Group */ + retl /* CTI+IEU1 Group */ + + mov %g7, %o0 /* IEU0 */ +11: stb %g5, [%o0 - 8] /* Store Group */ + retl /* CTI+IEU1 Group */ + mov %g7, %o0 /* IEU0 */ + +12: or %g1, %g2, %g1 /* IEU0 Group */ + ldub [%o1], %o3 /* Load */ + sllx %g1, 7, %g2 /* IEU0 Group */ + stb %o3, [%o0] /* Store Group */ + +13: add %o0, 1, %o0 /* IEU0 */ + add %o1, 1, %o1 /* IEU1 */ + andcc %o3, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 4b /* CTI */ + + lduba [%o1] ASI_PNF, %o3 /* Load */ + andcc %o0, 7, %g0 /* IEU1 Group */ + bne,a,pt %icc, 13b /* CTI */ + stb %o3, [%o0] /* Store */ + + andcc %o1, 7, %g3 /* IEU1 Group */ + be,a,pt %icc, 1b /* CTI */ + ldx [%o1], %o3 /* Load */ +14: orcc %g0, 64, %g4 /* IEU1 Group */ + + sllx %g3, 3, %g5 /* IEU0 */ + sub %o1, %g3, %o1 /* IEU0 Group */ + sub %g4, %g5, %g4 /* IEU1 */ + /* %g1 = 0101010101010101 * + * %g2 = 8080808080808080 * + * %g3 = source alignment * + * %g5 = number of bits to shift left * + * %g4 = number of bits to shift right */ + ldxa [%o1] ASI_PNF, %o5 /* Load Group */ + + addcc %o1, 8, %o1 /* IEU1 */ +15: sllx %o5, %g5, %o3 /* IEU0 Group */ + ldxa [%o1] ASI_PNF, %o5 /* Load */ + srlx %o5, %g4, %o4 /* IEU0 Group */ + + add %o0, 8, %o0 /* IEU1 */ + or %o3, %o4, %o3 /* IEU0 Group */ + add %o1, 8, %o1 /* IEU1 */ + sub %o3, %g1, %o4 /* IEU0 Group */ + +#ifdef EIGHTBIT_NOT_RARE + andn %o4, %o3, %o4 /* IEU0 Group */ +#endif + andcc %o4, %g2, %g0 /* IEU1 Group */ + be,a,pt %xcc, 15b /* CTI */ + stx %o3, [%o0 - 8] /* Store */ + srlx %o3, 56, %o4 /* IEU0 Group */ + + andcc %o4, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 22f /* CTI */ + srlx %o3, 48, %o4 /* IEU0 */ + andcc %o4, 0xff, %g0 /* IEU1 Group */ + + be,pn %icc, 21f /* CTI */ + srlx %o3, 40, %o4 /* IEU0 */ + andcc %o4, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 20f /* CTI */ + + srlx %o3, 32, %o4 /* IEU0 */ + andcc %o4, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 19f /* CTI */ + srlx %o3, 24, %o4 /* IEU0 */ + + andcc %o4, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 18f /* CTI */ + srlx %o3, 16, %o4 /* IEU0 */ + andcc %o4, 0xff, %g0 /* IEU1 Group */ + + be,pn %icc, 17f /* CTI */ + srlx %o3, 8, %o4 /* IEU0 */ + andcc %o4, 0xff, %g0 /* IEU1 Group */ + be,pn %icc, 16f /* CTI */ + + andcc %o3, 0xff, %g0 /* IEU1 Group */ + bne,pn %icc, 15b /* CTI */ + stx %o3, [%o0 - 8] /* Store */ + retl /* CTI+IEU1 Group */ + + mov %g7, %o0 /* IEU0 */ + + .align 16 +16: srlx %o3, 8, %o4 /* IEU0 Group */ + stb %o4, [%o0 - 2] /* Store */ +17: srlx %o3, 16, %o4 /* IEU0 Group */ + stb %o4, [%o0 - 3] /* Store */ + +18: srlx %o3, 24, %o4 /* IEU0 Group */ + stb %o4, [%o0 - 4] /* Store */ +19: srlx %o3, 32, %o4 /* IEU0 Group */ + stw %o4, [%o0 - 8] /* Store */ + + retl /* CTI+IEU1 Group */ + mov %g7, %o0 /* IEU0 */ + nop + nop + +20: srlx %o3, 40, %o4 /* IEU0 Group */ + stb %o4, [%o0 - 6] /* Store */ +21: srlx %o3, 48, %o4 /* IEU0 Group */ + stb %o4, [%o0 - 7] /* Store */ + +22: srlx %o3, 56, %o4 /* IEU0 Group */ + stb %o4, [%o0 - 8] /* Store */ + retl /* CTI+IEU1 Group */ + mov %g7, %o0 /* IEU0 */ +END(strcpy) |