Annotation of OpenXM_contrib/gmp/mpn/x86/pentium4/sse2/addmul_1.asm, Revision 1.1
1.1 ! ohara 1: dnl Intel Pentium-4 mpn_addmul_1 -- Multiply a limb vector with a limb and add
! 2: dnl the result to a second limb vector.
! 3:
! 4: dnl Copyright 2001, 2002 Free Software Foundation, Inc.
! 5: dnl
! 6: dnl This file is part of the GNU MP Library.
! 7: dnl
! 8: dnl The GNU MP Library is free software; you can redistribute it and/or
! 9: dnl modify it under the terms of the GNU Lesser General Public License as
! 10: dnl published by the Free Software Foundation; either version 2.1 of the
! 11: dnl License, or (at your option) any later version.
! 12: dnl
! 13: dnl The GNU MP Library is distributed in the hope that it will be useful,
! 14: dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
! 15: dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
! 16: dnl Lesser General Public License for more details.
! 17: dnl
! 18: dnl You should have received a copy of the GNU Lesser General Public
! 19: dnl License along with the GNU MP Library; see the file COPYING.LIB. If
! 20: dnl not, write to the Free Software Foundation, Inc., 59 Temple Place -
! 21: dnl Suite 330, Boston, MA 02111-1307, USA.
! 22:
! 23: include(`../config.m4')
! 24:
! 25:
! 26: C P4: 6 cycles/limb, unstable timing, at least on early Pentium4 silicon
! 27: C (stepping 10).
! 28:
! 29:
! 30: C mp_limb_t mpn_addmul_1 (mp_ptr dst, mp_srcptr src, mp_size_t size,
! 31: C mp_limb_t multiplier);
! 32: C mp_limb_t mpn_addmul_1c (mp_ptr dst, mp_srcptr src, mp_size_t size,
! 33: C mp_limb_t multiplier, mp_limb_t carry);
! 34: C
! 35: C Only the carry limb propagation is on the dependent chain, but some other
! 36: C Pentium4 pipeline magic brings down performance to 6 cycles/l from the
! 37: C ideal 4 cycles/l.
! 38:
! 39: defframe(PARAM_CARRY, 20)
! 40: defframe(PARAM_MULTIPLIER,16)
! 41: defframe(PARAM_SIZE, 12)
! 42: defframe(PARAM_SRC, 8)
! 43: defframe(PARAM_DST, 4)
! 44:
! 45: TEXT
! 46: ALIGN(16)
! 47: PROLOGUE(mpn_addmul_1c)
! 48: deflit(`FRAME',0)
! 49: movd PARAM_CARRY, %mm0
! 50: jmp L(start_1c)
! 51: EPILOGUE()
! 52:
! 53: PROLOGUE(mpn_addmul_1)
! 54: deflit(`FRAME',0)
! 55: pxor %mm0, %mm0
! 56: L(start_1c):
! 57: movl PARAM_SRC, %eax
! 58: movl PARAM_SIZE, %ecx
! 59: movl PARAM_DST, %edx
! 60: movd PARAM_MULTIPLIER, %mm7
! 61:
! 62: C eax src, incrementing
! 63: C ebx
! 64: C ecx loop counter, decrementing
! 65: C edx dst, incrementing
! 66: C
! 67: C mm0 carry, low 32-bits
! 68: C mm7 multiplier
! 69:
! 70: L(loop):
! 71: movd (%eax), %mm1 C src
! 72: leal 4(%eax), %eax
! 73: movd (%edx),%mm2 C dst
! 74: pmuludq %mm7, %mm1
! 75: paddq %mm1, %mm2 C prod
! 76: paddq %mm2, %mm0 C carry
! 77: subl $1, %ecx
! 78: movd %mm0, (%edx) C result
! 79: psrlq $32, %mm0
! 80: leal 4(%edx), %edx
! 81: jnz L(loop)
! 82:
! 83: movd %mm0, %eax
! 84: emms
! 85: ret
! 86:
! 87: EPILOGUE()
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>