1dnl S/390-64 mpn_add_n and mpn_sub_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 5.5 35C z990 3 36C z9 ? 37C z10 6 38C z196 ? 39 40C TODO 41C * Optimise for small n 42C * Use r0 and save/restore one less register 43C * Using logops_n's v1 inner loop operand order make the loop about 20% 44C faster, at the expense of highly alignment-dependent performance. 45 46C INPUT PARAMETERS 47define(`rp', `%r2') 48define(`up', `%r3') 49define(`vp', `%r4') 50define(`n', `%r5') 51 52ifdef(`OPERATION_add_n', ` 53 define(ADSB, alg) 54 define(ADSBCR, alcgr) 55 define(ADSBC, alcg) 56 define(RETVAL,`dnl 57 lghi %r2, 0 58 alcgr %r2, %r2') 59 define(func, mpn_add_n) 60 define(func_nc, mpn_add_nc)') 61ifdef(`OPERATION_sub_n', ` 62 define(ADSB, slg) 63 define(ADSBCR, slbgr) 64 define(ADSBC, slbg) 65 define(RETVAL,`dnl 66 slbgr %r2, %r2 67 lcgr %r2, %r2') 68 define(func, mpn_sub_n) 69 define(func_nc, mpn_sub_nc)') 70 71MULFUNC_PROLOGUE(mpn_add_n mpn_sub_n) 72 73ASM_START() 74PROLOGUE(func) 75 stmg %r6, %r8, 48(%r15) 76 77 aghi n, 3 78 lghi %r7, 3 79 srlg %r1, n, 2 80 ngr %r7, n C n mod 4 81 je L(b1) 82 cghi %r7, 2 83 jl L(b2) 84 jne L(b0) 85 86L(b3): lmg %r5, %r7, 0(up) 87 la up, 24(up) 88 ADSB %r5, 0(vp) 89 ADSBC %r6, 8(vp) 90 ADSBC %r7, 16(vp) 91 la vp, 24(vp) 92 stmg %r5, %r7, 0(rp) 93 la rp, 24(rp) 94 brctg %r1, L(top) 95 j L(end) 96 97L(b0): lmg %r5, %r8, 0(up) C This redundant insns is no mistake, 98 la up, 32(up) C it is needed to make main loop run 99 ADSB %r5, 0(vp) C fast for n = 0 (mod 4). 100 ADSBC %r6, 8(vp) 101 j L(m0) 102 103L(b1): lg %r5, 0(up) 104 la up, 8(up) 105 ADSB %r5, 0(vp) 106 la vp, 8(vp) 107 stg %r5, 0(rp) 108 la rp, 8(rp) 109 brctg %r1, L(top) 110 j L(end) 111 112L(b2): lmg %r5, %r6, 0(up) 113 la up, 16(up) 114 ADSB %r5, 0(vp) 115 ADSBC %r6, 8(vp) 116 la vp, 16(vp) 117 stmg %r5, %r6, 0(rp) 118 la rp, 16(rp) 119 brctg %r1, L(top) 120 j L(end) 121 122L(top): lmg %r5, %r8, 0(up) 123 la up, 32(up) 124 ADSBC %r5, 0(vp) 125 ADSBC %r6, 8(vp) 126L(m0): ADSBC %r7, 16(vp) 127 ADSBC %r8, 24(vp) 128 la vp, 32(vp) 129 stmg %r5, %r8, 0(rp) 130 la rp, 32(rp) 131 brctg %r1, L(top) 132 133L(end): RETVAL 134 lmg %r6, %r8, 48(%r15) 135 br %r14 136EPILOGUE() 137