glibc/sysdeps/hppa/sub_n.s
1996-05-07 21:04:45 +00:00

60 lines
1.7 KiB
ArmAsm

; 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, 1994 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.
; 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.
.code
.export __mpn_sub_n
__mpn_sub_n
.proc
.callinfo frame=0,no_calls
.entry
ldws,ma 4(0,%r25),%r20
ldws,ma 4(0,%r24),%r19
addib,= -1,%r23,L$end ; check for (SIZE == 1)
sub %r20,%r19,%r28 ; subtract first limbs ignoring cy
L$loop ldws,ma 4(0,%r25),%r20
ldws,ma 4(0,%r24),%r19
stws,ma %r28,4(0,%r26)
addib,<> -1,%r23,L$loop
subb %r20,%r19,%r28
L$end stws %r28,0(0,%r26)
addc %r0,%r0,%r28
bv 0(%r2)
subi 1,%r28,%r28
.exit
.procend