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;! HP-PA __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
;! store difference in a third limb vector.
;! Copyright (C) 1992-2024 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
;! <https://www.gnu.org/licenses/>.
;! INPUT PARAMETERS
;! res_ptr gr26
;! s1_ptr gr25
;! s2_ptr gr24
;! size gr23
;! One might want to unroll this as for other processors, but it turns
;! out that the data cache contention after a store makes such
;! unrolling useless. We can't come under 5 cycles/limb anyway.
.text
.export __mpn_sub_n
__mpn_sub_n:
.proc
.callinfo frame=0,no_calls
.entry
ldws,ma 4(%r25),%r21
ldws,ma 4(%r24),%r20
addib,= -1,%r23,L$end ;! check for (SIZE == 1)
sub %r21,%r20,%r28 ;! subtract first limbs ignoring cy
L$loop: ldws,ma 4(%r25),%r21
ldws,ma 4(%r24),%r20
stws,ma %r28,4(%r26)
addib,<> -1,%r23,L$loop
subb %r21,%r20,%r28
L$end: stws %r28,0(%r26)
addc %r0,%r0,%r28
bv 0(%r2)
subi 1,%r28,%r28
.exit
.procend
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