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glibc/ports/sysdeps/alpha/sub_n.S
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# Alpha __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and | |
# store difference in a third 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 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/>. | |
# INPUT PARAMETERS | |
# res_ptr $16 | |
# s1_ptr $17 | |
# s2_ptr $18 | |
# size $19 | |
.set noreorder | |
.set noat | |
.text | |
.align 3 | |
.globl __mpn_sub_n | |
.ent __mpn_sub_n | |
__mpn_sub_n: | |
.frame $30,0,$26,0 | |
ldq $3,0($17) | |
ldq $4,0($18) | |
subq $19,1,$19 | |
and $19,4-1,$2 # number of limbs in first loop | |
bis $31,$31,$0 | |
beq $2,.L0 # if multiple of 4 limbs, skip first loop | |
subq $19,$2,$19 | |
.Loop0: subq $2,1,$2 | |
ldq $5,8($17) | |
addq $4,$0,$4 | |
ldq $6,8($18) | |
cmpult $4,$0,$1 | |
subq $3,$4,$4 | |
cmpult $3,$4,$0 | |
stq $4,0($16) | |
or $0,$1,$0 | |
addq $17,8,$17 | |
addq $18,8,$18 | |
bis $5,$5,$3 | |
bis $6,$6,$4 | |
addq $16,8,$16 | |
bne $2,.Loop0 | |
.L0: beq $19,.Lend | |
.align 3 | |
.Loop: subq $19,4,$19 | |
ldq $5,8($17) | |
addq $4,$0,$4 | |
ldq $6,8($18) | |
cmpult $4,$0,$1 | |
subq $3,$4,$4 | |
cmpult $3,$4,$0 | |
stq $4,0($16) | |
or $0,$1,$0 | |
ldq $3,16($17) | |
addq $6,$0,$6 | |
ldq $4,16($18) | |
cmpult $6,$0,$1 | |
subq $5,$6,$6 | |
cmpult $5,$6,$0 | |
stq $6,8($16) | |
or $0,$1,$0 | |
ldq $5,24($17) | |
addq $4,$0,$4 | |
ldq $6,24($18) | |
cmpult $4,$0,$1 | |
subq $3,$4,$4 | |
cmpult $3,$4,$0 | |
stq $4,16($16) | |
or $0,$1,$0 | |
ldq $3,32($17) | |
addq $6,$0,$6 | |
ldq $4,32($18) | |
cmpult $6,$0,$1 | |
subq $5,$6,$6 | |
cmpult $5,$6,$0 | |
stq $6,24($16) | |
or $0,$1,$0 | |
addq $17,32,$17 | |
addq $18,32,$18 | |
addq $16,32,$16 | |
bne $19,.Loop | |
.Lend: addq $4,$0,$4 | |
cmpult $4,$0,$1 | |
subq $3,$4,$4 | |
cmpult $3,$4,$0 | |
stq $4,0($16) | |
or $0,$1,$0 | |
ret $31,($26),1 | |
.end __mpn_sub_n |