Annotation of OpenXM_contrib/gmp/mpn/pa32/sub_n.asm, Revision 1.1
1.1 ! ohara 1: dnl HP-PA mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
! 2: dnl store difference in a third limb vector.
! 3:
! 4: dnl Copyright 1992, 1994, 2000, 2001, 2002 Free Software Foundation, Inc.
! 5:
! 6: dnl This file is part of the GNU MP Library.
! 7:
! 8: dnl The GNU MP Library is free software; you can redistribute it and/or modify
! 9: dnl it under the terms of the GNU Lesser General Public License as published
! 10: dnl by the Free Software Foundation; either version 2.1 of the License, or (at
! 11: dnl your option) any later version.
! 12:
! 13: dnl The GNU MP Library is distributed in the hope that it will be useful, but
! 14: dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 15: dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
! 16: dnl License for more details.
! 17:
! 18: dnl You should have received a copy of the GNU Lesser General Public License
! 19: dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write to
! 20: dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
! 21: dnl MA 02111-1307, USA.
! 22:
! 23: include(`../config.m4')
! 24:
! 25: C INPUT PARAMETERS
! 26: C res_ptr gr26
! 27: C s1_ptr gr25
! 28: C s2_ptr gr24
! 29: C size gr23
! 30:
! 31: C One might want to unroll this as for other processors, but it turns out that
! 32: C the data cache contention after a store makes such unrolling useless. We
! 33: C can't come under 5 cycles/limb anyway.
! 34:
! 35: ASM_START()
! 36: PROLOGUE(mpn_sub_n)
! 37: ldws,ma 4(0,%r25),%r20
! 38: ldws,ma 4(0,%r24),%r19
! 39:
! 40: addib,= -1,%r23,L(end) C check for (SIZE == 1)
! 41: sub %r20,%r19,%r28 C subtract first limbs ignoring cy
! 42:
! 43: .label L(loop)
! 44: ldws,ma 4(0,%r25),%r20
! 45: ldws,ma 4(0,%r24),%r19
! 46: stws,ma %r28,4(0,%r26)
! 47: addib,<> -1,%r23,L(loop)
! 48: subb %r20,%r19,%r28
! 49:
! 50: .label L(end)
! 51: stws %r28,0(0,%r26)
! 52: addc %r0,%r0,%r28
! 53: bv 0(%r2)
! 54: subi 1,%r28,%r28
! 55: EPILOGUE()
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