1dnl S/390-64 mpn_addlsh1_n and mpn_rsblsh1_n. 2 3dnl Copyright 2011 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6dnl 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of either: 9dnl 10dnl * the GNU Lesser General Public License as published by the Free 11dnl Software Foundation; either version 3 of the License, or (at your 12dnl option) any later version. 13dnl 14dnl or 15dnl 16dnl * the GNU General Public License as published by the Free Software 17dnl Foundation; either version 2 of the License, or (at your option) any 18dnl later version. 19dnl 20dnl or both in parallel, as here. 21dnl 22dnl The GNU MP Library is distributed in the hope that it will be useful, but 23dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 24dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 25dnl for more details. 26dnl 27dnl You should have received copies of the GNU General Public License and the 28dnl GNU Lesser General Public License along with the GNU MP Library. If not, 29dnl see https://www.gnu.org/licenses/. 30 31include(`../config.m4') 32 33C cycles/limb 34C z900 9 35C z990 4.75 36C z9 ? 37C z10 11 38C z196 ? 39 40C TODO 41C * Optimise for small n, avoid 'la' like in aors_n.asm. 42C * Tune to reach 3.5 c/l. For addlsh1, we could let the main alcgr propagate 43C carry to the lsh1 alcgr. 44C * Compute RETVAL for sublsh1_n less stupidly. 45 46C INPUT PARAMETERS 47define(`rp', `%r2') 48define(`up', `%r3') 49define(`vp', `%r4') 50define(`n', `%r5') 51 52ifdef(`OPERATION_addlsh1_n',` 53 define(ADSB, alg) 54 define(ADSBC, alcg) 55 define(INITCY, `lghi %r9, -1') 56 define(RETVAL, `la %r2, 2(%r1,%r9)') 57 define(func, mpn_addlsh1_n) 58') 59ifdef(`OPERATION_rsblsh1_n',` 60 define(ADSB, slg) 61 define(ADSBC, slbg) 62 define(INITCY, `lghi %r9, 0') 63 define(RETVAL,`dnl 64 algr %r1, %r9 65 lghi %r2, 1 66 algr %r2, %r1') 67 define(func, mpn_rsblsh1_n) 68') 69 70MULFUNC_PROLOGUE(mpn_addlsh1_n mpn_rsblsh1_n) 71 72ASM_START() 73PROLOGUE(func) 74 stmg %r6, %r9, 48(%r15) 75 76 aghi n, 3 77 lghi %r7, 3 78 srlg %r0, n, 2 79 ngr %r7, n C n mod 4 80 je L(b1) 81 cghi %r7, 2 82 jl L(b2) 83 jne L(b0) 84 85L(b3): lmg %r5, %r7, 0(vp) 86 la vp, 24(vp) 87 88 algr %r5, %r5 89 alcgr %r6, %r6 90 alcgr %r7, %r7 91 slbgr %r1, %r1 92 93 ADSB %r5, 0(up) 94 ADSBC %r6, 8(up) 95 ADSBC %r7, 16(up) 96 la up, 24(up) 97 slbgr %r9, %r9 98 99 stmg %r5, %r7, 0(rp) 100 la rp, 24(rp) 101 brctg %r0, L(top) 102 j L(end) 103 104L(b0): lghi %r1, -1 105 INITCY 106 j L(top) 107 108L(b1): lg %r5, 0(vp) 109 la vp, 8(vp) 110 111 algr %r5, %r5 112 slbgr %r1, %r1 113 ADSB %r5, 0(up) 114 la up, 8(up) 115 slbgr %r9, %r9 116 117 stg %r5, 0(rp) 118 la rp, 8(rp) 119 brctg %r0, L(top) 120 j L(end) 121 122L(b2): lmg %r5, %r6, 0(vp) 123 la vp, 16(vp) 124 125 algr %r5, %r5 126 alcgr %r6, %r6 127 slbgr %r1, %r1 128 129 ADSB %r5, 0(up) 130 ADSBC %r6, 8(up) 131 la up, 16(up) 132 slbgr %r9, %r9 133 134 stmg %r5, %r6, 0(rp) 135 la rp, 16(rp) 136 brctg %r0, L(top) 137 j L(end) 138 139L(top): lmg %r5, %r8, 0(vp) 140 la vp, 32(vp) 141 142 aghi %r1, 1 C restore carry 143 144 alcgr %r5, %r5 145 alcgr %r6, %r6 146 alcgr %r7, %r7 147 alcgr %r8, %r8 148 149 slbgr %r1, %r1 C save carry 150 151 aghi %r9, 1 C restore carry 152 153 ADSBC %r5, 0(up) 154 ADSBC %r6, 8(up) 155 ADSBC %r7, 16(up) 156 ADSBC %r8, 24(up) 157 la up, 32(up) 158 159 slbgr %r9, %r9 C save carry 160 161 stmg %r5, %r8, 0(rp) 162 la rp, 32(rp) 163 brctg %r0, L(top) 164 165L(end): RETVAL 166 lmg %r6, %r9, 48(%r15) 167 br %r14 168EPILOGUE() 169