Annotation of OpenXM_contrib/gmp/mpn/x86/k7/mod_34lsub1.asm, Revision 1.1
1.1 ! ohara 1: dnl AMD K7 mpn_mod_32lsub1 -- remainder modulo 2^24-1.
! 2:
! 3: dnl Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
! 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:
! 25: C K7: 1.0 cycles/limb
! 26:
! 27:
! 28: C mp_limb_t mpn_mod_34lsub1 (mp_srcptr src, mp_size_t size)
! 29: C
! 30: C The loop form below and the 64 byte code alignment seem necessary for the
! 31: C claimed speed. This is a bit strange, since normally k7 isn't very
! 32: C sensitive to such things. Perhaps there has to be 6 instructions in the
! 33: C first 16 bytes for the BTB entry or something.
! 34:
! 35: defframe(PARAM_SIZE, 8)
! 36: defframe(PARAM_SRC, 4)
! 37:
! 38: dnl re-use parameter space
! 39: define(SAVE_EDI, `PARAM_SIZE')
! 40:
! 41: TEXT
! 42: ALIGN(64)
! 43: PROLOGUE(mpn_mod_34lsub1)
! 44: deflit(`FRAME',0)
! 45:
! 46: movl PARAM_SIZE, %ecx
! 47: movl PARAM_SRC, %edx
! 48:
! 49: subl $2, %ecx
! 50: ja L(three_or_more)
! 51:
! 52: movl (%edx), %eax
! 53: jb L(one)
! 54:
! 55: movl 4(%edx), %ecx
! 56: movl %eax, %edx
! 57: shrl $24, %eax C src[0] low
! 58:
! 59: andl $0xFFFFFF, %edx C src[0] high
! 60: addl %edx, %eax
! 61: movl %ecx, %edx
! 62:
! 63: andl $0xFFFF, %ecx
! 64: shrl $16, %edx C src[1] high
! 65: addl %edx, %eax
! 66:
! 67: shll $8, %ecx C src[1] low
! 68: addl %ecx, %eax
! 69:
! 70: L(one):
! 71: ret
! 72:
! 73:
! 74: L(three_or_more):
! 75: C eax
! 76: C ebx
! 77: C ecx size-2
! 78: C edx src
! 79: C esi
! 80: C edi
! 81: C ebp
! 82:
! 83: pushl %ebx FRAME_pushl()
! 84: xorl %eax, %eax
! 85: xorl %ebx, %ebx
! 86:
! 87: movl %edi, SAVE_EDI
! 88: pushl %esi FRAME_pushl()
! 89: xorl %esi, %esi C and clear carry flag
! 90:
! 91:
! 92: C code offset 0x40 at this point
! 93: L(top):
! 94: C eax acc 0mod3
! 95: C ebx acc 1mod3
! 96: C ecx counter, limbs
! 97: C edx src
! 98: C esi acc 2mod3
! 99: C edi
! 100: C ebp
! 101:
! 102: leal 24(%edx), %edx
! 103: leal -2(%ecx), %ecx
! 104: adcl -24(%edx), %eax
! 105: adcl -20(%edx), %ebx
! 106: adcl -16(%edx), %esi
! 107:
! 108: decl %ecx
! 109: jng L(done_loop)
! 110:
! 111: leal -2(%ecx), %ecx
! 112: adcl -12(%edx), %eax
! 113: adcl -8(%edx), %ebx
! 114: adcl -4(%edx), %esi
! 115:
! 116: decl %ecx
! 117: jg L(top)
! 118:
! 119:
! 120: leal 12(%edx), %edx
! 121:
! 122:
! 123: L(done_loop):
! 124: C ecx is -2, -1 or 0 representing 0, 1 or 2 more limbs, respectively
! 125:
! 126: incl %ecx
! 127: movl $0xFFFFFFFF, %edi
! 128: js L(combine)
! 129:
! 130: adcl -12(%edx), %eax
! 131: decl %ecx
! 132: movl $0xFFFFFF00, %edi
! 133: js L(combine)
! 134:
! 135: adcl -8(%edx), %ebx
! 136: movl $0xFFFF0000, %edi
! 137:
! 138:
! 139: L(combine):
! 140: C eax acc 0mod3
! 141: C ebx acc 1mod3
! 142: C ecx
! 143: C edx
! 144: C esi acc 2mod3
! 145: C edi mask
! 146: C ebp
! 147:
! 148: sbbl %ecx, %ecx C carry
! 149: movl %eax, %edx C 0mod3
! 150: shrl $24, %eax C 0mod3 high
! 151:
! 152: andl %edi, %ecx C carry masked
! 153: andl $0x00FFFFFF, %edx C 0mod3 low
! 154: movl %ebx, %edi C 1mod3
! 155:
! 156: subl %ecx, %eax C apply carry
! 157: shrl $16, %ebx C 1mod3 high
! 158: andl $0xFFFF, %edi
! 159:
! 160: addl %edx, %eax C apply 0mod3 low
! 161: movl %esi, %edx C 2mod3
! 162: shll $8, %edi C 1mod3 low
! 163:
! 164: addl %ebx, %eax C apply 1mod3 high
! 165: shrl $8, %esi C 2mod3 high
! 166: andl $0xFF, %edx C 2mod3 low
! 167:
! 168: addl %edi, %eax C apply 1mod3 low
! 169: shll $16, %edx C 2mod3 low
! 170:
! 171: addl %esi, %eax C apply 2mod3 high
! 172: popl %esi FRAME_popl()
! 173:
! 174: movl SAVE_EDI, %edi
! 175: addl %edx, %eax C apply 2mod3 low
! 176: popl %ebx FRAME_popl()
! 177:
! 178: ret
! 179:
! 180: EPILOGUE()
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to mod_34lsub1.asm CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [local] / OpenXM_contrib / gmp / mpn / x86 / k7