sub_n.asm revision 1.1
1 dnl SPARC 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 2001 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 3 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. If not, see http://www.gnu.org/licenses/. 20 21 22 include(`../config.m4') 23 24 C INPUT PARAMETERS 25 define(rp,%o0) 26 define(s1p,%o1) 27 define(s2p,%o2) 28 define(n,%o3) 29 define(cy,%g1) 30 31 C This code uses 64-bit operations on `o' and `g' registers. It doesn't 32 C require that `o' registers' upper 32 bits are preserved by the operating 33 C system, but if they are not, they must be zeroed. That is indeed what 34 C happens at least on Slowaris 2.5 and 2.6. 35 36 C On UltraSPARC 1 and 2, this code runs at 3 cycles/limb from the Dcache and at 37 C about 10 cycles/limb from the Ecache. 38 39 ASM_START() 40 PROLOGUE(mpn_sub_n) 41 lduw [s1p+0],%o4 42 lduw [s2p+0],%o5 43 addcc n,-2,n 44 bl,pn %icc,L(end1) 45 lduw [s1p+4],%g2 46 lduw [s2p+4],%g3 47 be,pn %icc,L(end2) 48 mov 0,cy 49 50 .align 16 51 L(loop): 52 sub %o4,%o5,%g4 53 add rp,8,rp 54 lduw [s1p+8],%o4 55 fitod %f0,%f2 56 C --- 57 sub %g4,cy,%g4 58 addcc n,-1,n 59 lduw [s2p+8],%o5 60 fitod %f0,%f2 61 C --- 62 srlx %g4,63,cy 63 add s2p,8,s2p 64 stw %g4,[rp-8] 65 be,pn %icc,L(exito)+4 66 C --- 67 sub %g2,%g3,%g4 68 addcc n,-1,n 69 lduw [s1p+12],%g2 70 fitod %f0,%f2 71 C --- 72 sub %g4,cy,%g4 73 add s1p,8,s1p 74 lduw [s2p+4],%g3 75 fitod %f0,%f2 76 C --- 77 srlx %g4,63,cy 78 bne,pt %icc,L(loop) 79 stw %g4,[rp-4] 80 C --- 81 L(exite): 82 sub %o4,%o5,%g4 83 sub %g4,cy,%g4 84 srlx %g4,63,cy 85 stw %g4,[rp+0] 86 sub %g2,%g3,%g4 87 sub %g4,cy,%g4 88 stw %g4,[rp+4] 89 retl 90 srlx %g4,63,%o0 91 92 L(exito): 93 sub %g2,%g3,%g4 94 sub %g4,cy,%g4 95 srlx %g4,63,cy 96 stw %g4,[rp-4] 97 sub %o4,%o5,%g4 98 sub %g4,cy,%g4 99 stw %g4,[rp+0] 100 retl 101 srlx %g4,63,%o0 102 103 L(end1): 104 sub %o4,%o5,%g4 105 stw %g4,[rp+0] 106 retl 107 srlx %g4,63,%o0 108 109 L(end2): 110 sub %o4,%o5,%g4 111 srlx %g4,63,cy 112 stw %g4,[rp+0] 113 sub %g2,%g3,%g4 114 sub %g4,cy,%g4 115 stw %g4,[rp+4] 116 retl 117 srlx %g4,63,%o0 118 EPILOGUE(mpn_sub_n) 119
Indexes created Wed Jul 15 00:26:21 UTC 2026