Annotation of OpenXM_contrib/gmp/mpn/x86/pentium4/sse2/add_n.asm, Revision 1.1
1.1 ! ohara 1: dnl Intel Pentium-4 mpn_add_n -- mpn addition.
! 2:
! 3: dnl Copyright 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 P4: 4.0 cycles/limb if dst!=src1 and dst!=src2
! 26: C 6.0 cycles/limb if dst==src1 or dst==src2
! 27:
! 28:
! 29: C mp_limb_t mpn_add_n (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,
! 30: C mp_size_t size);
! 31: C mp_limb_t mpn_add_nc (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,
! 32: C mp_size_t size, mp_limb_t carry);
! 33: C
! 34: C The 4 c/l achieved here isn't particularly good, but is better than 9 c/l
! 35: C for a basic adc loop.
! 36:
! 37: defframe(PARAM_CARRY,20)
! 38: defframe(PARAM_SIZE, 16)
! 39: defframe(PARAM_SRC2, 12)
! 40: defframe(PARAM_SRC1, 8)
! 41: defframe(PARAM_DST, 4)
! 42:
! 43: dnl re-use parameter space
! 44: define(SAVE_EBX,`PARAM_SRC1')
! 45:
! 46: TEXT
! 47: ALIGN(8)
! 48:
! 49: PROLOGUE(mpn_add_nc)
! 50: deflit(`FRAME',0)
! 51:
! 52: movd PARAM_CARRY, %mm0
! 53: jmp L(start_nc)
! 54:
! 55: EPILOGUE()
! 56:
! 57: ALIGN(8)
! 58: PROLOGUE(mpn_add_n)
! 59: deflit(`FRAME',0)
! 60:
! 61: pxor %mm0, %mm0
! 62:
! 63: L(start_nc):
! 64: movl PARAM_SRC1, %eax
! 65: movl %ebx, SAVE_EBX
! 66: movl PARAM_SRC2, %ebx
! 67: movl PARAM_DST, %edx
! 68: movl PARAM_SIZE, %ecx
! 69:
! 70: leal (%eax,%ecx,4), %eax C src1 end
! 71: leal (%ebx,%ecx,4), %ebx C src2 end
! 72: leal (%edx,%ecx,4), %edx C dst end
! 73: negl %ecx C -size
! 74:
! 75: L(top):
! 76: C eax src1 end
! 77: C ebx src2 end
! 78: C ecx counter, limbs, negative
! 79: C edx dst end
! 80: C mm0 carry bit
! 81:
! 82: movd (%eax,%ecx,4), %mm1
! 83: movd (%ebx,%ecx,4), %mm2
! 84: paddq %mm2, %mm1
! 85:
! 86: paddq %mm1, %mm0
! 87: movd %mm0, (%edx,%ecx,4)
! 88:
! 89: psrlq $32, %mm0
! 90:
! 91: addl $1, %ecx
! 92: jnz L(top)
! 93:
! 94:
! 95: movd %mm0, %eax
! 96: movl SAVE_EBX, %ebx
! 97: emms
! 98: ret
! 99:
! 100: EPILOGUE()
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