mirror of
https://sourceware.org/git/glibc.git
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395 lines
12 KiB
ArmAsm
395 lines
12 KiB
ArmAsm
/* strncpy(DST, SRC, COUNT) - Copy no more than COUNT bytes of the
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null-terminated string from SRC to DST. If SRC does not cover all of
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COUNT, the balance is zeroed.
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For SPARC v9.
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Copyright (C) 1998-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <asm/asi.h>
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#ifndef XCC
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#define XCC xcc
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#define USE_BPR
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.register %g2, #scratch
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.register %g3, #scratch
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.register %g6, #scratch
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#endif
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/* Normally, this uses
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((xword - 0x0101010101010101) & 0x8080808080808080) test
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to find out if any byte in xword could be zero. This is fast, but
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also gives false alarm for any byte in range 0x81-0xff. It does
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not matter for correctness, as if this test tells us there could
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be some zero byte, we check it byte by byte, but if bytes with
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high bits set are common in the strings, then this will give poor
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performance. You can #define EIGHTBIT_NOT_RARE and the algorithm
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will use one tick slower, but more precise test
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((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080),
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which does not give any false alarms (but if some bits are set,
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one cannot assume from it which bytes are zero and which are not).
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It is yet to be measured, what is the correct default for glibc
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in these days for an average user.
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*/
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.text
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.align 32
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ENTRY(strncpy)
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sethi %hi(0x01010101), %g1 /* IEU0 Group */
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#ifdef USE_BPR
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brz,pn %o2, 19f /* CTI+IEU1 */
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#else
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tst %o2 /* IEU1 */
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be,pn %XCC, 19f /* CTI */
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#endif
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mov %o0, %g6 /* IEU0 Group */
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or %g1, %lo(0x01010101), %g1 /* IEU1 */
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andcc %o0, 7, %g0 /* IEU1 Group */
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sllx %g1, 32, %g2 /* IEU0 */
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bne,pn %icc, 26f /* CTI */
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or %g1, %g2, %g1 /* IEU0 Group */
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andcc %o1, 7, %g3 /* IEU1 */
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bne,pn %icc, 28f /* CTI */
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sllx %g1, 7, %g2 /* IEU0 Group */
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ldx [%o1], %o3 /* Load */
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1: add %o1, 8, %o1 /* IEU1 */
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2: subcc %o2, 8, %o2 /* IEU1 Group */
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bl,pn %XCC, 18f /* CTI */
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sub %o3, %g1, %o4 /* IEU0 */
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add %o0, 8, %o0 /* IEU0 Group */
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#ifdef EIGHTBIT_NOT_MORE
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andn %o4, %o3, %o4 /* IEU1 */
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#endif
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mov %o3, %g3 /* IEU1 */
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ldxa [%o1] ASI_PNF, %o3 /* Load */
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add %o1, 8, %o1 /* IEU0 Group */
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andcc %o4, %g2, %g0 /* IEU1 */
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be,a,pt %xcc, 2b /* CTI */
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stx %g3, [%o0-8] /* Store Group */
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srlx %g3, 56, %g5 /* IEU0 Group */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 16f /* CTI */
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srlx %g3, 48, %g4 /* IEU0 */
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andcc %g4, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 15f /* CTI */
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srlx %g3, 40, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 14f /* CTI */
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srlx %g3, 32, %g4 /* IEU0 */
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andcc %g4, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 13f /* CTI */
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srlx %g3, 24, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 12f /* CTI */
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srlx %g3, 16, %g4 /* IEU0 */
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andcc %g4, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 11f /* CTI */
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srlx %g3, 8, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 10f /* CTI */
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andcc %g3, 0xff, %g0 /* IEU1 Group */
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bne,pt %icc, 2b /* CTI */
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3: stx %g3, [%o0-8] /* Store */
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andncc %o2, 31, %g3 /* IEU1 Group */
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4: be,pn %XCC, 41f /* CTI */
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and %o2, 31, %o2 /* IEU1 Group */
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40: stx %g0, [%o0] /* Store */
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stx %g0, [%o0 + 8] /* Store Group */
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subcc %g3, 32, %g3 /* IEU1 */
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stx %g0, [%o0 + 16] /* Store Group */
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stx %g0, [%o0 + 24] /* Store Group */
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bne,pt %XCC, 40b /* CTI */
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add %o0, 32, %o0 /* IEU0 */
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41: subcc %o2, 8, %o2 /* IEU1 Group */
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bl,a,pn %XCC, 6f /* CTI */
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andcc %o2, 4, %g0 /* IEU1 Group */
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5: stx %g0, [%o0] /* Store */
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subcc %o2, 8, %o2 /* IEU1 Group */
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bge,pt %XCC, 5b /* CTI */
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add %o0, 8, %o0 /* IEU0 */
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andcc %o2, 4, %g0 /* IEU1 Group */
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6: be,a,pn %icc, 7f /* CTI */
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andcc %o2, 2, %g0 /* IEU1 Group */
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stw %g0, [%o0] /* Store */
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add %o0, 4, %o0 /* IEU0 */
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andcc %o2, 2, %g0 /* IEU1 Group */
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7: be,a,pn %icc, 8f /* CTI */
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andcc %o2, 1, %g0 /* IEU1 Group */
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sth %g0, [%o0] /* Store */
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add %o0, 2, %o0 /* IEU0 */
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andcc %o2, 1, %g0 /* IEU1 Group */
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8: bne,a,pn %icc, 9f /* CTI */
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stb %g0, [%o0] /* Store */
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9: retl /* CTI+IEU1 Group */
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mov %g6, %o0 /* IEU0 */
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.align 16
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10: ba,pt %xcc, 3b /* CTI */
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sllx %g5, 8, %g3 /* IEU0 */
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11: ba,pt %xcc, 3b /* CTI Group */
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sllx %g4, 16, %g3 /* IEU0 */
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12: ba,pt %xcc, 3b /* CTI Group */
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sllx %g5, 24, %g3 /* IEU0 */
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13: ba,pt %xcc, 3b /* CTI Group */
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sllx %g4, 32, %g3 /* IEU0 */
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14: ba,pt %xcc, 3b /* CTI Group */
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sllx %g5, 40, %g3 /* IEU0 */
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15: ba,pt %xcc, 3b /* CTI Group */
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sllx %g4, 48, %g3 /* IEU0 */
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16: ba,pt %xcc, 3b /* CTI */
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sllx %g5, 56, %g3 /* IEU0 */
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17: or %o3, %o4, %o3 /* IEU0 Group */
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sub %o3, %g1, %o4 /* IEU1 */
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18: addcc %o2, 8, %o2 /* IEU1 Group */
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be,pn %XCC, 19f /* CTI */
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andcc %o4, %g2, %g0 /* IEU1 Group */
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be,pt %xcc, 21f /* CTI */
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srlx %o3, 56, %g5 /* IEU0 */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 20f /* CTI */
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stb %g5, [%o0] /* Store */
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add %o0, 1, %o0 /* IEU0 Group */
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subcc %o2, 1, %o2 /* IEU1 */
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be,pn %XCC, 19f /* CTI */
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srlx %o3, 48, %g5 /* IEU0 Group */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 20f /* CTI */
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stb %g5, [%o0] /* Store */
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add %o0, 1, %o0 /* IEU0 Group */
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subcc %o2, 1, %o2 /* IEU1 */
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be,pn %XCC, 19f /* CTI */
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srlx %o3, 40, %g5 /* IEU0 Group */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 20f /* CTI */
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stb %g5, [%o0] /* Store */
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add %o0, 1, %o0 /* IEU0 Group */
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subcc %o2, 1, %o2 /* IEU1 */
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be,pn %XCC, 19f /* CTI */
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srlx %o3, 32, %g5 /* IEU0 Group */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 20f /* CTI */
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stb %g5, [%o0] /* Store */
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add %o0, 1, %o0 /* IEU0 Group */
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subcc %o2, 1, %o2 /* IEU1 */
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be,pn %XCC, 19f /* CTI */
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srlx %o3, 24, %g5 /* IEU0 Group */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 20f /* CTI */
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stb %g5, [%o0] /* Store */
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add %o0, 1, %o0 /* IEU0 Group */
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subcc %o2, 1, %o2 /* IEU1 */
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be,pn %XCC, 19f /* CTI */
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srlx %o3, 16, %g5 /* IEU0 Group */
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andcc %g5, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 20f /* CTI */
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stb %g5, [%o0] /* Store */
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add %o0, 1, %o0 /* IEU0 Group */
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subcc %o2, 1, %o2 /* IEU1 */
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be,pn %XCC, 19f /* CTI */
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srlx %o3, 8, %g5 /* IEU0 Group */
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stb %g5, [%o0] /* Store */
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19: retl /* CTI+IEU1 Group */
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mov %g6, %o0 /* IEU0 */
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50: stb %g0, [%o0] /* Store Group */
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20: subcc %o2, 1, %o2 /* IEU1 Group */
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bne,pt %XCC, 50b /* CTI */
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add %o0, 1, %o0 /* IEU0 */
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retl /* CTI+IEU1 Group */
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mov %g6, %o0 /* IEU0 */
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21: andcc %o2, 4, %g0 /* IEU1 Group */
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be,pn %icc, 22f /* CTI */
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srlx %o3, 32, %g5 /* IEU0 */
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stw %g5, [%o0] /* Store Group */
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add %o0, 4, %o0 /* IEU0 */
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mov %o3, %g5 /* IEU1 */
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22: andcc %o2, 2, %g0 /* IEU1 Group */
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be,pn %icc, 23f /* CTI */
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srlx %g5, 16, %g4 /* IEU0 */
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sth %g4, [%o0] /* Store Group */
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add %o0, 2, %o0 /* IEU0 */
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mov %g5, %g4 /* IEU1 */
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23: srlx %g4, 8, %g4 /* IEU0 Group */
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andcc %o2, 1, %g0 /* IEU1 */
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bne,a,pn %icc, 24f /* CTI */
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stb %g4, [%o0] /* Store Group */
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24: retl /* CTI+IEU1 Group */
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mov %g6, %o0 /* IEU0 */
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25: andcc %o0, 7, %g0 /* IEU1 Group */
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be,a,pn %icc, 4b /* CTI */
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andncc %o2, 31, %g3 /* IEU1 Group */
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stb %g0, [%o0] /* Store Group */
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subcc %o2, 1, %o2 /* IEU1 */
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bne,pt %XCC, 25b /* CTI */
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add %o0, 1, %o0 /* IEU0 Group */
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retl /* CTI+IEU1 Group */
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mov %g6, %o0 /* IEU0 */
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.align 16
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26: ldub [%o1], %o3 /* Load */
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sllx %g1, 7, %g2 /* IEU0 Group */
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stb %o3, [%o0] /* Store */
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27: subcc %o2, 1, %o2 /* IEU1 */
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be,pn %XCC, 9b /* CTI */
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add %o1, 1, %o1 /* IEU0 Group */
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add %o0, 1, %o0 /* IEU1 */
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andcc %o3, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 25b /* CTI */
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lduba [%o1] ASI_PNF, %o3 /* Load */
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andcc %o0, 7, %g0 /* IEU1 Group */
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bne,a,pt %icc, 27b /* CTI */
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stb %o3, [%o0] /* Store */
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andcc %o1, 7, %g3 /* IEU1 Group */
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be,a,pt %icc, 1b /* CTI */
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ldx [%o1], %o3 /* Load */
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28: orcc %g0, 64, %g4 /* IEU1 Group */
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sllx %g3, 3, %g5 /* IEU0 */
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sub %g4, %g5, %g4 /* IEU0 Group */
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sub %o1, %g3, %o1 /* IEU1 */
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/* %g1 = 0101010101010101
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%g2 = 8080808080808080
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%g3 = source alignment
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%g5 = number of bits to shift left
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%g4 = number of bits to shift right */
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ldxa [%o1] ASI_PNF, %o5 /* Load Group */
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addcc %o1, 8, %o1 /* IEU1 */
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29: sllx %o5, %g5, %o3 /* IEU0 Group */
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ldxa [%o1] ASI_PNF, %o5 /* Load */
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subcc %o2, 8, %o2 /* IEU1 */
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bl,pn %XCC, 17b /* CTI */
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srlx %o5, %g4, %o4 /* IEU0 Group */
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add %o1, 8, %o1 /* IEU1 */
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or %o3, %o4, %o3 /* IEU0 Group */
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add %o0, 8, %o0 /* IEU1 */
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sub %o3, %g1, %o4 /* IEU0 Group */
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#ifdef EIGHTBIT_NOT_RARE
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andn %o4, %o3, %o4 /* IEU0 Group */
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#endif
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andcc %o4, %g2, %g0 /* IEU1 Group */
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be,a,pt %xcc, 29b /* CTI */
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stx %o3, [%o0-8] /* Store */
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srlx %o3, 56, %o4 /* IEU0 Group */
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andcc %o4, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 36f /* CTI */
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srlx %o3, 48, %o4 /* IEU0 */
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andcc %o4, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 35f /* CTI */
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srlx %o3, 40, %o4 /* IEU0 */
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andcc %o4, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 34f /* CTI */
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srlx %o3, 32, %o4 /* IEU0 */
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andcc %o4, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 33f /* CTI */
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srlx %o3, 24, %o4 /* IEU0 */
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andcc %o4, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 32f /* CTI */
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srlx %o3, 16, %o4 /* IEU0 */
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andcc %o4, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 31f /* CTI */
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srlx %o3, 8, %o4 /* IEU0 */
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andcc %o4, 0xff, %g0 /* IEU1 Group */
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be,pn %icc, 30f /* CTI */
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andcc %o3, 0xff, %g0 /* IEU1 Group */
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bne,pn %icc, 29b /* CTI */
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stx %o3, [%o0-8] /* Store */
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ba,pt %xcc, 4b /* CTI Group */
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andncc %o2, 31, %g3 /* IEU1 */
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30: srlx %o3, 8, %o4 /* IEU0 */
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ba,pt %xcc, 3b /* CTI */
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sllx %o4, 8, %g3 /* IEU0 Group */
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31: srlx %o3, 16, %o4 /* IEU0 Group */
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ba,pt %xcc, 3b /* CTI */
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sllx %o4, 16, %g3 /* IEU0 Group */
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32: srlx %o3, 24, %o4 /* IEU0 Group */
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ba,pt %xcc, 3b /* CTI */
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sllx %o4, 24, %g3 /* IEU0 Group */
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33: srlx %o3, 32, %o4 /* IEU0 Group */
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ba,pt %xcc, 3b /* CTI */
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sllx %o4, 32, %g3 /* IEU0 Group */
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34: srlx %o3, 40, %o4 /* IEU0 Group */
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ba,pt %xcc, 3b /* CTI */
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sllx %o4, 40, %g3 /* IEU0 Group */
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35: srlx %o3, 48, %o4 /* IEU0 Group */
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ba,pt %xcc, 3b /* CTI */
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sllx %o4, 48, %g3 /* IEU0 Group */
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36: srlx %o3, 56, %o4 /* IEU0 Group */
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ba,pt %xcc, 3b /* CTI */
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sllx %o4, 56, %g3 /* IEU0 Group */
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END(strncpy)
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libc_hidden_builtin_def (strncpy)
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