96 lines
2.7 KiB
NASM
96 lines
2.7 KiB
NASM
dnl HP-PA 2.0 mpn_sub_n -- Subtract two limb vectors of the same length > 0
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dnl and store difference in a third limb vector.
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dnl Copyright 1997, 2000, 2002, 2003 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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dnl This runs at 2 cycles/limb on PA8000 and 1.6875 cycles/limb on PA8500. It
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dnl should be possible to reach the cache bandwith 1.5 cycles/limb at least
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dnl with PA8500. The problem now is stalling of the first SUB,DB after LDO,
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dnl where the processor gets confused about where carry comes from.
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include(`../config.m4')
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dnl INPUT PARAMETERS
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define(`rp',`%r26')
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define(`up',`%r25')
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define(`vp',`%r24')
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define(`n',`%r23')
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ifdef(`HAVE_ABI_2_0w',
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` .level 2.0w
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',` .level 2.0
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')
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PROLOGUE(mpn_sub_n)
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sub %r0, n, %r22
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depw,z %r22, 30, 3, %r28 C r28 = 2 * (-n & 7)
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depw,z %r22, 28, 3, %r22 C r22 = 8 * (-n & 7)
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sub up, %r22, up C offset up
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sub vp, %r22, vp C offset vp
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blr %r28, %r0 C branch into loop
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sub rp, %r22, rp C offset rp and set carry
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LDEF(loop)
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ldd 0(up), %r20
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ldd 0(vp), %r31
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sub,db %r20, %r31, %r20
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std %r20, 0(rp)
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LDEF(7) ldd 8(up), %r21
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ldd 8(vp), %r19
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sub,db %r21, %r19, %r21
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std %r21, 8(rp)
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LDEF(6) ldd 16(up), %r20
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ldd 16(vp), %r31
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sub,db %r20, %r31, %r20
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std %r20, 16(rp)
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LDEF(5) ldd 24(up), %r21
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ldd 24(vp), %r19
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sub,db %r21, %r19, %r21
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std %r21, 24(rp)
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LDEF(4) ldd 32(up), %r20
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ldd 32(vp), %r31
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sub,db %r20, %r31, %r20
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std %r20, 32(rp)
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LDEF(3) ldd 40(up), %r21
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ldd 40(vp), %r19
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sub,db %r21, %r19, %r21
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std %r21, 40(rp)
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LDEF(2) ldd 48(up), %r20
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ldd 48(vp), %r31
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sub,db %r20, %r31, %r20
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std %r20, 48(rp)
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LDEF(1) ldd 56(up), %r21
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ldd 56(vp),%r19
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sub,db %r21, %r19, %r21
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ldo 64(up), up
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std %r21, 56(rp)
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ldo 64(vp), vp
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addib,> -8, n, L(loop)
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ldo 64(rp), rp
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add,dc %r0, %r0, %r29
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subi 1, %r29, %r29
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bve (%r2)
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ifdef(`HAVE_ABI_2_0w',
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` copy %r29, %r28
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',` ldi 0, %r28
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')
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EPILOGUE(mpn_sub_n)
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