Return to copyd.asm CVS log

Up to [local] / OpenXM_contrib / gmp / mpn / x86 / k7 / mmx

Annotation of OpenXM_contrib/gmp/mpn/x86/k7/mmx/copyd.asm, Revision 1.1.1.2

1.1       maekawa     1: dnl  AMD K7 mpn_copyd -- copy limb vector, decrementing.
                      2:
1.1.1.2 ! ohara       3: dnl  Copyright 1999, 2000, 2002 Free Software Foundation, Inc.
1.1       maekawa     4: dnl
                      5: dnl  This file is part of the GNU MP Library.
                      6: dnl
                      7: dnl  The GNU MP Library is free software; you can redistribute it and/or
                      8: dnl  modify it under the terms of the GNU Lesser General Public License as
                      9: dnl  published by the Free Software Foundation; either version 2.1 of the
                     10: dnl  License, or (at your option) any later version.
                     11: dnl
                     12: dnl  The GNU MP Library is distributed in the hope that it will be useful,
                     13: dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14: dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
                     15: dnl  Lesser General Public License for more details.
                     16: dnl
                     17: dnl  You should have received a copy of the GNU Lesser General Public
                     18: dnl  License along with the GNU MP Library; see the file COPYING.LIB.  If
                     19: dnl  not, write to the Free Software Foundation, Inc., 59 Temple Place -
                     20: dnl  Suite 330, Boston, MA 02111-1307, USA.
                     21:
                     22: include(`../config.m4')
                     23:
                     24:
1.1.1.2 ! ohara      25: C    alignment dst/src, A=0mod8 N=4mod8
        !            26: C       A/A   A/N   N/A   N/N
        !            27: C K7    0.75  1.0   1.0   0.75
        !            28:
        !            29:
1.1       maekawa    30: C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size);
                     31: C
                     32: C The various comments in mpn/x86/k7/copyi.asm apply here too.
                     33:
                     34: defframe(PARAM_SIZE,12)
                     35: defframe(PARAM_SRC, 8)
                     36: defframe(PARAM_DST, 4)
                     37: deflit(`FRAME',0)
                     38:
                     39: dnl  parameter space reused
                     40: define(SAVE_EBX,`PARAM_SIZE')
                     41: define(SAVE_ESI,`PARAM_SRC')
                     42:
                     43: dnl  minimum 5 since the unrolled code can't handle less than 5
                     44: deflit(UNROLL_THRESHOLD, 5)
                     45:
1.1.1.2 ! ohara      46:        TEXT
1.1       maekawa    47:        ALIGN(32)
                     48: PROLOGUE(mpn_copyd)
                     49:
                     50:        movl    PARAM_SIZE, %ecx
                     51:        movl    %ebx, SAVE_EBX
                     52:
                     53:        movl    PARAM_SRC, %eax
                     54:        movl    PARAM_DST, %edx
                     55:
                     56:        cmpl    $UNROLL_THRESHOLD, %ecx
                     57:        jae     L(unroll)
                     58:
                     59:        orl     %ecx, %ecx
                     60:        jz      L(simple_done)
                     61:
                     62: L(simple):
                     63:        C eax   src
                     64:        C ebx   scratch
                     65:        C ecx   counter
                     66:        C edx   dst
                     67:        C
                     68:        C this loop is 2 cycles/limb
                     69:
                     70:        movl    -4(%eax,%ecx,4), %ebx
                     71:        movl    %ebx, -4(%edx,%ecx,4)
                     72:        decl    %ecx
                     73:        jnz     L(simple)
                     74:
                     75: L(simple_done):
                     76:        movl    SAVE_EBX, %ebx
                     77:        ret
                     78:
                     79:
                     80: L(unroll):
                     81:        movl    %esi, SAVE_ESI
                     82:        leal    (%eax,%ecx,4), %ebx
                     83:        leal    (%edx,%ecx,4), %esi
                     84:
                     85:        andl    %esi, %ebx
                     86:        movl    SAVE_ESI, %esi
                     87:        subl    $4, %ecx                C size-4
                     88:
                     89:        testl   $4, %ebx   C testl to pad code closer to 16 bytes for L(top)
                     90:        jz      L(aligned)
                     91:
                     92:        C both src and dst unaligned, process one limb to align them
                     93:        movl    12(%eax,%ecx,4), %ebx
                     94:        movl    %ebx, 12(%edx,%ecx,4)
                     95:        decl    %ecx
                     96: L(aligned):
                     97:
                     98:
                     99:        ALIGN(16)
                    100: L(top):
                    101:        C eax   src
                    102:        C ebx
                    103:        C ecx   counter, limbs
                    104:        C edx   dst
                    105:
                    106:        movq    8(%eax,%ecx,4), %mm0
                    107:        movq    (%eax,%ecx,4), %mm1
                    108:        subl    $4, %ecx
                    109:        movq    %mm0, 16+8(%edx,%ecx,4)
                    110:        movq    %mm1, 16(%edx,%ecx,4)
                    111:        jns     L(top)
                    112:
                    113:
                    114:        C now %ecx is -4 to -1 representing respectively 0 to 3 limbs remaining
                    115:
                    116:        testb   $2, %cl
                    117:        jz      L(finish_not_two)
                    118:
                    119:        movq    8(%eax,%ecx,4), %mm0
                    120:        movq    %mm0, 8(%edx,%ecx,4)
                    121: L(finish_not_two):
                    122:
                    123:        testb   $1, %cl
                    124:        jz      L(done)
                    125:
                    126:        movl    (%eax), %ebx
                    127:        movl    %ebx, (%edx)
                    128:
                    129: L(done):
                    130:        movl    SAVE_EBX, %ebx
                    131:        emms
                    132:        ret
                    133:
                    134:
                    135: EPILOGUE()