glibc/sysdeps/mips/mips64/sub_n.S

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/* MIPS3 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
* store difference in a third limb vector.
*
* Copyright (C) 1995-2017 Free Software Foundation, Inc.
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*
* This file is part of the GNU MP Library.
*
* The GNU MP Library is free software; you can redistribute it and/or modify
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* 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
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* 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
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
*
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* You should have received a copy of the GNU Lesser General Public License
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* along with the GNU MP Library. If not, see
* <http://www.gnu.org/licenses/>.
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*/
#include <sysdep.h>
#include <sys/asm.h>
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/* INPUT PARAMETERS
* res_ptr $4
* s1_ptr $5
* s2_ptr $6
* size $7
*/
#ifdef __PIC__
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.option pic2
#endif
ENTRY (__mpn_sub_n)
#ifdef __PIC__
SETUP_GP /* ??? unused */
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#endif
.set noreorder
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.set nomacro
ld $10,0($5)
ld $11,0($6)
daddiu $7,$7,-1
and $9,$7,4-1 # number of limbs in first loop
beq $9,$0,L(L0) # if multiple of 4 limbs, skip first loop
move $2,$0
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dsubu $7,$7,$9
L(Loop0): daddiu $9,$9,-1
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ld $12,8($5)
daddu $11,$11,$2
ld $13,8($6)
sltu $8,$11,$2
dsubu $11,$10,$11
sltu $2,$10,$11
sd $11,0($4)
or $2,$2,$8
daddiu $5,$5,8
daddiu $6,$6,8
move $10,$12
move $11,$13
bne $9,$0,L(Loop0)
daddiu $4,$4,8
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L(L0): beq $7,$0,L(Lend)
nop
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L(Loop): daddiu $7,$7,-4
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ld $12,8($5)
daddu $11,$11,$2
ld $13,8($6)
sltu $8,$11,$2
dsubu $11,$10,$11
sltu $2,$10,$11
sd $11,0($4)
or $2,$2,$8
ld $10,16($5)
daddu $13,$13,$2
ld $11,16($6)
sltu $8,$13,$2
dsubu $13,$12,$13
sltu $2,$12,$13
sd $13,8($4)
or $2,$2,$8
ld $12,24($5)
daddu $11,$11,$2
ld $13,24($6)
sltu $8,$11,$2
dsubu $11,$10,$11
sltu $2,$10,$11
sd $11,16($4)
or $2,$2,$8
ld $10,32($5)
daddu $13,$13,$2
ld $11,32($6)
sltu $8,$13,$2
dsubu $13,$12,$13
sltu $2,$12,$13
sd $13,24($4)
or $2,$2,$8
daddiu $5,$5,32
daddiu $6,$6,32
bne $7,$0,L(Loop)
daddiu $4,$4,32
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L(Lend): daddu $11,$11,$2
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sltu $8,$11,$2
dsubu $11,$10,$11
sltu $2,$10,$11
sd $11,0($4)
j $31
or $2,$2,$8
END (__mpn_sub_n)