1dnl S/390-64 mpn_mul_basecase. 2 3dnl Copyright 2011 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of the GNU Lesser General Public License as published 9dnl by the Free Software Foundation; either version 3 of the License, or (at 10dnl your option) any later version. 11 12dnl The GNU MP Library is distributed in the hope that it will be useful, but 13dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 15dnl License for more details. 16 17dnl You should have received a copy of the GNU Lesser General Public License 18dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. 19 20include(`../config.m4') 21 22C cycles/limb 23C z900 ? 24C z990 23 25C z9 ? 26C z10 ? 27C z196 ? 28 29C TODO 30C * Perhaps add special case for un <= 2. 31C * Replace loops by faster code. The mul_1 and addmul_1 loops could be sped 32C up by about 10%. 33 34C INPUT PARAMETERS 35define(`rp', `%r2') 36define(`up', `%r3') 37define(`un', `%r4') 38define(`vp', `%r5') 39define(`vn', `%r6') 40 41define(`zero', `%r8') 42 43ASM_START() 44PROLOGUE(mpn_mul_basecase) 45 cghi un, 2 46 jhe L(ge2) 47 48C un = vn = 1 49 lg %r1, 0(vp) 50 mlg %r0, 0(up) 51 stg %r1, 0(rp) 52 stg %r0, 8(rp) 53 br %r14 54 55L(ge2): C jne L(gen) 56 57 58L(gen): 59C mul_1 ======================================================================= 60 61 stmg %r6, %r12, 48(%r15) 62 lghi zero, 0 63 aghi un, -1 64 65 lg %r7, 0(vp) 66 lg %r11, 0(up) 67 lghi %r12, 8 C init index register 68 mlgr %r10, %r7 69 lgr %r9, un 70 stg %r11, 0(rp) 71 cr %r15, %r15 C clear carry flag 72 73L(tm): lg %r1, 0(%r12,up) 74 mlgr %r0, %r7 75 alcgr %r1, %r10 76 lgr %r10, %r0 C copy high part to carry limb 77 stg %r1, 0(%r12,rp) 78 la %r12, 8(%r12) 79 brctg %r9, L(tm) 80 81 alcgr %r0, zero 82 stg %r0, 0(%r12,rp) 83 84C addmul_1 loop =============================================================== 85 86 aghi vn, -1 87 je L(outer_end) 88L(outer_loop): 89 90 la rp, 8(rp) C rp += 1 91 la vp, 8(vp) C up += 1 92 lg %r7, 0(vp) 93 lg %r11, 0(up) 94 lghi %r12, 8 C init index register 95 mlgr %r10, %r7 96 lgr %r9, un 97 alg %r11, 0(rp) 98 stg %r11, 0(rp) 99 100L(tam): lg %r1, 0(%r12,up) 101 lg %r11, 0(%r12,rp) 102 mlgr %r0, %r7 103 alcgr %r1, %r11 104 alcgr %r0, zero 105 algr %r1, %r10 106 lgr %r10, %r0 107 stg %r1, 0(%r12,rp) 108 la %r12, 8(%r12) 109 brctg %r9, L(tam) 110 111 alcgr %r0, zero 112 stg %r0, 0(%r12,rp) 113 114 brctg vn, L(outer_loop) 115L(outer_end): 116 117 lmg %r6, %r12, 48(%r15) 118 br %r14 119EPILOGUE() 120