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60 lines
1.7 KiB
ArmAsm
60 lines
1.7 KiB
ArmAsm
; HP-PA __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
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; store difference in a third limb vector.
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; Copyright (C) 1992, 1994 Free Software Foundation, Inc.
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; This file is part of the GNU MP Library.
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; 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 Library General Public License as published by
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; the Free Software Foundation; either version 2 of the License, or (at your
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; option) any later version.
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; The GNU MP Library is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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; License for more details.
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; You should have received a copy of the GNU Library General Public License
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; along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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; the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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; MA 02111-1307, USA.
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; INPUT PARAMETERS
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; res_ptr gr26
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; s1_ptr gr25
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; s2_ptr gr24
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; size gr23
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; One might want to unroll this as for other processors, but it turns
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; out that the data cache contention after a store makes such
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; unrolling useless. We can't come under 5 cycles/limb anyway.
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.code
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.export __mpn_sub_n
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__mpn_sub_n
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.proc
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.callinfo frame=0,no_calls
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.entry
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ldws,ma 4(0,%r25),%r20
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ldws,ma 4(0,%r24),%r19
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addib,= -1,%r23,L$end ; check for (SIZE == 1)
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sub %r20,%r19,%r28 ; subtract first limbs ignoring cy
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L$loop ldws,ma 4(0,%r25),%r20
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ldws,ma 4(0,%r24),%r19
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stws,ma %r28,4(0,%r26)
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addib,<> -1,%r23,L$loop
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subb %r20,%r19,%r28
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L$end stws %r28,0(0,%r26)
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addc %r0,%r0,%r28
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bv 0(%r2)
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subi 1,%r28,%r28
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.exit
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.procend
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