1dnl MIPS64 mpn_submul_1 -- Multiply a limb vector with a single limb and 2dnl subtract the product from a second limb vector. 3 4dnl Copyright 1992, 1994, 1995, 2000, 2001, 2002 Free Software Foundation, 5dnl Inc. 6 7dnl This file is part of the GNU MP Library. 8 9dnl The GNU MP Library is free software; you can redistribute it and/or modify 10dnl it under the terms of the GNU Lesser General Public License as published 11dnl by the Free Software Foundation; either version 3 of the License, or (at 12dnl your option) any later version. 13 14dnl The GNU MP Library is distributed in the hope that it will be useful, but 15dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17dnl License for more details. 18 19dnl You should have received a copy of the GNU Lesser General Public License 20dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. 21 22include(`../config.m4') 23 24C INPUT PARAMETERS 25C res_ptr $4 26C s1_ptr $5 27C size $6 28C s2_limb $7 29 30ASM_START() 31PROLOGUE(mpn_submul_1) 32 33C feed-in phase 0 34 ld $8,0($5) 35 36C feed-in phase 1 37 daddiu $5,$5,8 38 dmultu $8,$7 39 40 daddiu $6,$6,-1 41 beq $6,$0,$LC0 42 move $2,$0 C zero cy2 43 44 daddiu $6,$6,-1 45 beq $6,$0,$LC1 46 ld $8,0($5) C load new s1 limb as early as possible 47 48Loop: ld $10,0($4) 49 mflo $3 50 mfhi $9 51 daddiu $5,$5,8 52 daddu $3,$3,$2 C add old carry limb to low product limb 53 dmultu $8,$7 54 ld $8,0($5) C load new s1 limb as early as possible 55 daddiu $6,$6,-1 C decrement loop counter 56 sltu $2,$3,$2 C carry from previous addition -> $2 57 dsubu $3,$10,$3 58 sgtu $10,$3,$10 59 daddu $2,$2,$10 60 sd $3,0($4) 61 daddiu $4,$4,8 62 bne $6,$0,Loop 63 daddu $2,$9,$2 C add high product limb and carry from addition 64 65C wind-down phase 1 66$LC1: ld $10,0($4) 67 mflo $3 68 mfhi $9 69 daddu $3,$3,$2 70 sltu $2,$3,$2 71 dmultu $8,$7 72 dsubu $3,$10,$3 73 sgtu $10,$3,$10 74 daddu $2,$2,$10 75 sd $3,0($4) 76 daddiu $4,$4,8 77 daddu $2,$9,$2 C add high product limb and carry from addition 78 79C wind-down phase 0 80$LC0: ld $10,0($4) 81 mflo $3 82 mfhi $9 83 daddu $3,$3,$2 84 sltu $2,$3,$2 85 dsubu $3,$10,$3 86 sgtu $10,$3,$10 87 daddu $2,$2,$10 88 sd $3,0($4) 89 j $31 90 daddu $2,$9,$2 C add high product limb and carry from addition 91EPILOGUE(mpn_submul_1) 92