/* Copy SRC to DEST returning the address of the terminating '\0' in DEST. For SPARC v9. Copyright (C) 1998-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. 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, see . */ #include #include #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(__stpcpy) sethi %hi(0x01010101), %g1 /* IEU0 Group */ 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 */ sub %o3, %g1, %o2 /* IEU1 */ 3: 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 */ sub %o0, 1, %o0 /* IEU0 */ .align 16 6: ba,pt %xcc, 23f /* CTI Group */ sub %o0, 3, %g6 /* IEU0 */ 5: sub %o0, 2, %g6 /* IEU0 Group */ stb %g5, [%o0 - 2] /* Store */ srlx %g3, 16, %g4 /* IEU0 Group */ 23: sth %g4, [%o0 - 4] /* Store */ srlx %g3, 32, %g4 /* IEU0 Group */ stw %g4, [%o0 - 8] /* Store */ retl /* CTI+IEU1 Group */ mov %g6, %o0 /* IEU0 */ 8: ba,pt %xcc, 24f /* CTI Group */ sub %o0, 5, %g6 /* IEU0 */ 7: sub %o0, 4, %g6 /* IEU0 Group */ stb %g5, [%o0 - 4] /* Store */ srlx %g3, 32, %g4 /* IEU0 Group */ 24: stw %g4, [%o0 - 8] /* Store */ retl /* CTI+IEU1 Group */ mov %g6, %o0 /* IEU0 */ 10: ba,pt %xcc, 25f /* CTI Group */ sub %o0, 7, %g6 /* IEU0 */ 9: sub %o0, 6, %g6 /* IEU0 Group */ stb %g5, [%o0 - 6] /* Store */ srlx %g3, 48, %g4 /* IEU0 */ 25: sth %g4, [%o0 - 8] /* Store Group */ retl /* CTI+IEU1 Group */ mov %g6, %o0 /* IEU0 */ 11: stb %g5, [%o0 - 8] /* Store Group */ retl /* CTI+IEU1 Group */ sub %o0, 8, %o0 /* IEU0 */ .align 16 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 */ sub %o0, 1, %o0 /* IEU0 */ .align 16 17: ba,pt %xcc, 26f /* CTI Group */ subcc %o0, 3, %g6 /* IEU1 */ 18: ba,pt %xcc, 27f /* CTI Group */ subcc %o0, 4, %g6 /* IEU1 */ 19: ba,pt %xcc, 28f /* CTI Group */ subcc %o0, 5, %g6 /* IEU1 */ 16: subcc %o0, 2, %g6 /* IEU1 Group */ srlx %o3, 8, %o4 /* IEU0 */ stb %o4, [%o0 - 2] /* Store */ 26: srlx %o3, 16, %o4 /* IEU0 Group */ stb %o4, [%o0 - 3] /* Store */ 27: srlx %o3, 24, %o4 /* IEU0 Group */ stb %o4, [%o0 - 4] /* Store */ 28: srlx %o3, 32, %o4 /* IEU0 Group */ stw %o4, [%o0 - 8] /* Store */ retl /* CTI+IEU1 Group */ mov %g6, %o0 /* IEU0 */ .align 16 21: ba,pt %xcc, 29f /* CTI Group */ subcc %o0, 7, %g6 /* IEU1 */ 22: ba,pt %xcc, 30f /* CTI Group */ subcc %o0, 8, %g6 /* IEU1 */ 20: subcc %o0, 6, %g6 /* IEU1 Group */ srlx %o3, 40, %o4 /* IEU0 */ stb %o4, [%o0 - 6] /* Store */ 29: srlx %o3, 48, %o4 /* IEU0 Group */ stb %o4, [%o0 - 7] /* Store */ 30: srlx %o3, 56, %o4 /* IEU0 Group */ stb %o4, [%o0 - 8] /* Store */ retl /* CTI+IEU1 Group */ mov %g6, %o0 /* IEU0 */ END(__stpcpy) weak_alias (__stpcpy, stpcpy) libc_hidden_def (__stpcpy) libc_hidden_builtin_def (stpcpy)