1dnl SPARC mpn_sub_n -- Subtract two limb vectors of the same length > 0 and 2dnl store difference in a third limb vector. 3 4dnl Copyright 2001 Free Software Foundation, Inc. 5 6dnl This file is part of the GNU MP Library. 7dnl 8dnl The GNU MP Library is free software; you can redistribute it and/or modify 9dnl it under the terms of either: 10dnl 11dnl * the GNU Lesser General Public License as published by the Free 12dnl Software Foundation; either version 3 of the License, or (at your 13dnl option) any later version. 14dnl 15dnl or 16dnl 17dnl * the GNU General Public License as published by the Free Software 18dnl Foundation; either version 2 of the License, or (at your option) any 19dnl later version. 20dnl 21dnl or both in parallel, as here. 22dnl 23dnl The GNU MP Library is distributed in the hope that it will be useful, but 24dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 25dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 26dnl for more details. 27dnl 28dnl You should have received copies of the GNU General Public License and the 29dnl GNU Lesser General Public License along with the GNU MP Library. If not, 30dnl see https://www.gnu.org/licenses/. 31 32 33include(`../config.m4') 34 35C INPUT PARAMETERS 36define(rp,%o0) 37define(s1p,%o1) 38define(s2p,%o2) 39define(n,%o3) 40define(cy,%g1) 41 42C This code uses 64-bit operations on `o' and `g' registers. It doesn't 43C require that `o' registers' upper 32 bits are preserved by the operating 44C system, but if they are not, they must be zeroed. That is indeed what 45C happens at least on Slowaris 2.5 and 2.6. 46 47C On UltraSPARC 1 and 2, this code runs at 3 cycles/limb from the Dcache and at 48C about 10 cycles/limb from the Ecache. 49 50ASM_START() 51PROLOGUE(mpn_sub_n) 52 lduw [s1p+0],%o4 53 lduw [s2p+0],%o5 54 addcc n,-2,n 55 bl,pn %icc,L(end1) 56 lduw [s1p+4],%g2 57 lduw [s2p+4],%g3 58 be,pn %icc,L(end2) 59 mov 0,cy 60 61 .align 16 62L(loop): 63 sub %o4,%o5,%g4 64 add rp,8,rp 65 lduw [s1p+8],%o4 66 fitod %f0,%f2 67C --- 68 sub %g4,cy,%g4 69 addcc n,-1,n 70 lduw [s2p+8],%o5 71 fitod %f0,%f2 72C --- 73 srlx %g4,63,cy 74 add s2p,8,s2p 75 stw %g4,[rp-8] 76 be,pn %icc,L(exito)+4 77C --- 78 sub %g2,%g3,%g4 79 addcc n,-1,n 80 lduw [s1p+12],%g2 81 fitod %f0,%f2 82C --- 83 sub %g4,cy,%g4 84 add s1p,8,s1p 85 lduw [s2p+4],%g3 86 fitod %f0,%f2 87C --- 88 srlx %g4,63,cy 89 bne,pt %icc,L(loop) 90 stw %g4,[rp-4] 91C --- 92L(exite): 93 sub %o4,%o5,%g4 94 sub %g4,cy,%g4 95 srlx %g4,63,cy 96 stw %g4,[rp+0] 97 sub %g2,%g3,%g4 98 sub %g4,cy,%g4 99 stw %g4,[rp+4] 100 retl 101 srlx %g4,63,%o0 102 103L(exito): 104 sub %g2,%g3,%g4 105 sub %g4,cy,%g4 106 srlx %g4,63,cy 107 stw %g4,[rp-4] 108 sub %o4,%o5,%g4 109 sub %g4,cy,%g4 110 stw %g4,[rp+0] 111 retl 112 srlx %g4,63,%o0 113 114L(end1): 115 sub %o4,%o5,%g4 116 stw %g4,[rp+0] 117 retl 118 srlx %g4,63,%o0 119 120L(end2): 121 sub %o4,%o5,%g4 122 srlx %g4,63,cy 123 stw %g4,[rp+0] 124 sub %g2,%g3,%g4 125 sub %g4,cy,%g4 126 stw %g4,[rp+4] 127 retl 128 srlx %g4,63,%o0 129EPILOGUE(mpn_sub_n) 130