121 lines
2.6 KiB
NASM
121 lines
2.6 KiB
NASM
dnl SPARC mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
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dnl store difference in a third limb vector.
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dnl Copyright 2001 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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include(`../config.m4')
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C INPUT PARAMETERS
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define(rp,%o0)
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define(s1p,%o1)
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define(s2p,%o2)
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define(n,%o3)
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define(cy,%g1)
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C This code uses 64-bit operations on `o' and `g' registers. It doesn't
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C require that `o' registers' upper 32 bits are preserved by the operating
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C system, but if they are not, they must be zeroed. That is indeed what
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C happens at least on Slowaris 2.5 and 2.6.
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C On UltraSPARC 1 and 2, this code runs at 3 cycles/limb from the Dcache and at
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C about 10 cycles/limb from the Ecache.
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ASM_START()
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PROLOGUE(mpn_sub_n)
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lduw [s1p+0],%o4
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lduw [s2p+0],%o5
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addcc n,-2,n
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bl,pn %icc,L(end1)
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lduw [s1p+4],%g2
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lduw [s2p+4],%g3
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be,pn %icc,L(end2)
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mov 0,cy
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.align 16
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L(loop):
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sub %o4,%o5,%g4
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add rp,8,rp
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lduw [s1p+8],%o4
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fitod %f0,%f2
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C ---
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sub %g4,cy,%g4
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addcc n,-1,n
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lduw [s2p+8],%o5
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fitod %f0,%f2
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C ---
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srlx %g4,63,cy
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add s2p,8,s2p
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stw %g4,[rp-8]
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be,pn %icc,L(exito)+4
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C ---
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sub %g2,%g3,%g4
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addcc n,-1,n
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lduw [s1p+12],%g2
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fitod %f0,%f2
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C ---
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sub %g4,cy,%g4
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add s1p,8,s1p
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lduw [s2p+4],%g3
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fitod %f0,%f2
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C ---
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srlx %g4,63,cy
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bne,pt %icc,L(loop)
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stw %g4,[rp-4]
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C ---
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L(exite):
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sub %o4,%o5,%g4
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sub %g4,cy,%g4
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srlx %g4,63,cy
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stw %g4,[rp+0]
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sub %g2,%g3,%g4
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sub %g4,cy,%g4
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stw %g4,[rp+4]
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retl
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srlx %g4,63,%o0
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L(exito):
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sub %g2,%g3,%g4
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sub %g4,cy,%g4
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srlx %g4,63,cy
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stw %g4,[rp-4]
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sub %o4,%o5,%g4
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sub %g4,cy,%g4
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stw %g4,[rp+0]
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retl
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srlx %g4,63,%o0
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L(end1):
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sub %o4,%o5,%g4
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stw %g4,[rp+0]
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retl
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srlx %g4,63,%o0
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L(end2):
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sub %o4,%o5,%g4
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srlx %g4,63,cy
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stw %g4,[rp+0]
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sub %g2,%g3,%g4
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sub %g4,cy,%g4
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stw %g4,[rp+4]
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retl
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srlx %g4,63,%o0
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EPILOGUE(mpn_sub_n)
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