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Diffstat (limited to 'sysdeps/mips/submul_1.S')
| -rw-r--r-- | sysdeps/mips/submul_1.S | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/sysdeps/mips/submul_1.S b/sysdeps/mips/submul_1.S new file mode 100644 index 0000000000..eae8ebbfaf --- /dev/null +++ b/sysdeps/mips/submul_1.S @@ -0,0 +1,98 @@ +/* MIPS __mpn_submul_1 -- Multiply a limb vector with a single limb and +subtract the product from a second limb vector. + +Copyright (C) 1995 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 Library General Public License as published by +the Free Software Foundation; either version 2 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 Library General Public +License for more details. + +You should have received a copy of the GNU Library General Public License +along with the GNU MP Library; see the file COPYING.LIB. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +MA 02111-1307, USA. */ + +#include <sysdep.h> + +/* INPUT PARAMETERS + res_ptr $4 + s1_ptr $5 + size $6 + s2_limb $7 +*/ +#ifdef PIC + .option pic2 +#endif +ENTRY (__mpn_submul_1) + .set noreorder +#ifdef PIC + .cpload t9 +#endif + .set nomacro + + /* warm up phase 0 */ + lw $8,0($5) + + /* warm up phase 1 */ + addiu $5,$5,4 + multu $8,$7 + + addiu $6,$6,-1 + beq $6,$0,$LC0 + move $2,$0 /* zero cy2 */ + + addiu $6,$6,-1 + beq $6,$0,$LC1 + lw $8,0($5) /* load new s1 limb as early as possible */ + +Loop: lw $10,0($4) + mflo $3 + mfhi $9 + addiu $5,$5,4 + addu $3,$3,$2 /* add old carry limb to low product limb */ + multu $8,$7 + lw $8,0($5) /* load new s1 limb as early as possible */ + addiu $6,$6,-1 /* decrement loop counter */ + sltu $2,$3,$2 /* carry from previous addition -> $2 */ + subu $3,$10,$3 + sgtu $10,$3,$10 + addu $2,$2,$10 + sw $3,0($4) + addiu $4,$4,4 + bne $6,$0,Loop /* should be "bnel" */ + addu $2,$9,$2 /* add high product limb and carry from addition */ + + /* cool down phase 1 */ +$LC1: lw $10,0($4) + mflo $3 + mfhi $9 + addu $3,$3,$2 + sltu $2,$3,$2 + multu $8,$7 + subu $3,$10,$3 + sgtu $10,$3,$10 + addu $2,$2,$10 + sw $3,0($4) + addiu $4,$4,4 + addu $2,$9,$2 /* add high product limb and carry from addition */ + + /* cool down phase 0 */ +$LC0: lw $10,0($4) + mflo $3 + mfhi $9 + addu $3,$3,$2 + sltu $2,$3,$2 + subu $3,$10,$3 + sgtu $10,$3,$10 + addu $2,$2,$10 + sw $3,0($4) + j $31 + addu $2,$9,$2 /* add high product limb and carry from addition */ |