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-;! HP-PA-1.1 __mpn_mul_1 -- Multiply a limb vector with a limb and store
-;! the result in a second limb vector.
-
-;! Copyright (C) 1992, 1993, 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 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; 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 r26
-;! s1_ptr r25
-;! size r24
-;! s2_limb r23
-
-;! This runs at 9 cycles/limb on a PA7000. With the used instructions, it can
-;! not become faster due to data cache contention after a store. On the
-;! PA7100 it runs at 7 cycles/limb, and that can not be improved either, since
-;! only the xmpyu does not need the integer pipeline, so the only dual-issue
-;! we will get are addc+xmpyu. Unrolling would not help either CPU.
-
-;! We could use fldds to read two limbs at a time from the S1 array, and that
-;! could bring down the times to 8.5 and 6.5 cycles/limb for the PA7000 and
-;! PA7100, respectively. We don't do that since it does not seem worth the
-;! (alignment) troubles...
-
-;! At least the PA7100 is rumored to be able to deal with cache-misses
-;! without stalling instruction issue. If this is true, and the cache is
-;! actually also lockup-free, we should use a deeper software pipeline, and
-;! load from S1 very early; (The loads and stores to -12(sp) will surely be
-;! in the cache.)
-
- .text
- .export __mpn_mul_1
-__mpn_mul_1:
- .proc
- .callinfo frame=64,no_calls
- .entry
-
- ldo 64(%r30),%r30
- fldws,ma 4(%r25),%fr5
- stw %r23,-16(%r30) ;! move s2_limb ...
- addib,= -1,%r24,L$just_one_limb
- fldws -16(%r30),%fr4 ;! ... into fr4
- add %r0,%r0,%r0 ;! clear carry
- xmpyu %fr4,%fr5,%fr6
- fldws,ma 4(%r25),%fr7
- fstds %fr6,-16(%r30)
- xmpyu %fr4,%fr7,%fr8
- ldw -12(%r30),%r20 ;! least significant limb in product
- ldw -16(%r30),%r28
-
- fstds %fr8,-16(%r30)
- addib,= -1,%r24,L$end
- ldw -12(%r30),%r1
-
-;! Main loop
-L$loop:
- fldws,ma 4(%r25),%fr5
- stws,ma %r20,4(%r26)
- addc %r28,%r1,%r20
- xmpyu %fr4,%fr5,%fr6
- ldw -16(%r30),%r28
- fstds %fr6,-16(%r30)
- addib,<> -1,%r24,L$loop
- ldw -12(%r30),%r1
-
-L$end:
- stws,ma %r20,4(%r26)
- addc %r28,%r1,%r20
- ldw -16(%r30),%r28
- stws,ma %r20,4(%r26)
- addc %r0,%r28,%r28
- bv 0(%r2)
- ldo -64(%r30),%r30
-
-L$just_one_limb:
- xmpyu %fr4,%fr5,%fr6
- fstds %fr6,-16(%r30)
- ldw -16(%r30),%r28
- ldo -64(%r30),%r30
- bv 0(%r2)
- fstws %fr6R,0(%r26)
-
- .exit
- .procend