| /* MIPS3 __mpn_submul_1 -- Multiply a limb vector with a single limb and |
| * subtract the product from a second limb vector. |
| * |
| * Copyright (C) 1992-2014 Free Software Foundation, Inc. |
| * |
| * This file is part of the GNU MP Library. |
| * |
| * The GNU MP Library is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as published by |
| * the Free Software Foundation; either version 2.1 of the License, or (at your |
| * option) any later version. |
| * |
| * The GNU MP Library is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| * License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with the GNU MP Library. If not, see |
| * <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <sysdep.h> |
| #include <sys/asm.h> |
| |
| /* INPUT PARAMETERS |
| * res_ptr $4 |
| * s1_ptr $5 |
| * size $6 |
| * s2_limb $7 |
| */ |
| |
| #ifdef __PIC__ |
| .option pic2 |
| #endif |
| ENTRY (__mpn_submul_1) |
| #ifdef __PIC__ |
| SETUP_GP /* ??? unused */ |
| #endif |
| .set noreorder |
| .set nomacro |
| |
| # warm up phase 0 |
| ld $8,0($5) |
| |
| # warm up phase 1 |
| daddiu $5,$5,8 |
| dmultu $8,$7 |
| |
| daddiu $6,$6,-1 |
| beq $6,$0,L(LC0) |
| move $2,$0 # zero cy2 |
| |
| daddiu $6,$6,-1 |
| beq $6,$0,L(LC1) |
| ld $8,0($5) # load new s1 limb as early as possible |
| |
| L(Loop): ld $10,0($4) |
| mflo $3 |
| mfhi $9 |
| daddiu $5,$5,8 |
| daddu $3,$3,$2 # add old carry limb to low product limb |
| dmultu $8,$7 |
| ld $8,0($5) # load new s1 limb as early as possible |
| daddiu $6,$6,-1 # decrement loop counter |
| sltu $2,$3,$2 # carry from previous addition -> $2 |
| dsubu $3,$10,$3 |
| sgtu $10,$3,$10 |
| daddu $2,$2,$10 |
| sd $3,0($4) |
| daddiu $4,$4,8 |
| bne $6,$0,L(Loop) |
| daddu $2,$9,$2 # add high product limb and carry from addition |
| |
| # cool down phase 1 |
| L(LC1): ld $10,0($4) |
| mflo $3 |
| mfhi $9 |
| daddu $3,$3,$2 |
| sltu $2,$3,$2 |
| dmultu $8,$7 |
| dsubu $3,$10,$3 |
| sgtu $10,$3,$10 |
| daddu $2,$2,$10 |
| sd $3,0($4) |
| daddiu $4,$4,8 |
| daddu $2,$9,$2 # add high product limb and carry from addition |
| |
| # cool down phase 0 |
| L(LC0): ld $10,0($4) |
| mflo $3 |
| mfhi $9 |
| daddu $3,$3,$2 |
| sltu $2,$3,$2 |
| dsubu $3,$10,$3 |
| sgtu $10,$3,$10 |
| daddu $2,$2,$10 |
| sd $3,0($4) |
| j $31 |
| daddu $2,$9,$2 # add high product limb and carry from addition |
| |
| END (__mpn_submul_1) |
