mul_1.asm
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上传日期:2022-08-06
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- dnl HP-PA 1.1 mpn_mul_1 -- Multiply a limb vector with a limb and store the
- dnl result in a second limb vector.
- dnl Copyright 1992, 1993, 1994, 2000, 2001, 2002 Free Software Foundation,
- dnl Inc.
- dnl This file is part of the GNU MP Library.
- dnl The GNU MP Library is free software; you can redistribute it and/or modify
- dnl it under the terms of the GNU Lesser General Public License as published
- dnl by the Free Software Foundation; either version 3 of the License, or (at
- dnl your option) any later version.
- dnl The GNU MP Library is distributed in the hope that it will be useful, but
- dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- dnl License for more details.
- dnl You should have received a copy of the GNU Lesser General Public License
- dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
- include(`../config.m4')
- C INPUT PARAMETERS
- C res_ptr r26
- C s1_ptr r25
- C size r24
- C s2_limb r23
- C This runs at 9 cycles/limb on a PA7000. With the used instructions, it can
- C not become faster due to data cache contention after a store. On the PA7100
- C it runs at 7 cycles/limb.
- C We could use fldds to read two limbs at a time from the S1 array, and that
- C could bring down the times to 8.5 and 6.5 cycles/limb for the PA7000 and
- C PA7100, respectively. We don't do that since it does not seem worth the
- C (alignment) troubles...
- C At least the PA7100 is rumored to be able to deal with cache-misses without
- C stalling instruction issue. If this is true, and the cache is actually also
- C lockup-free, we should use a deeper software pipeline, and load from S1 very
- C early! (The loads and stores to -12(sp) will surely be in the cache.)
- ASM_START()
- PROLOGUE(mpn_mul_1)
- C .callinfo frame=64,no_calls
- ldo 64(%r30),%r30
- fldws,ma 4(%r25),%fr5
- stw %r23,-16(%r30) C move s2_limb ...
- addib,= -1,%r24,L(just_one_limb)
- fldws -16(%r30),%fr4 C ... into fr4
- add %r0,%r0,%r0 C clear carry
- xmpyu %fr4,%fr5,%fr6
- fldws,ma 4(%r25),%fr7
- fstds %fr6,-16(%r30)
- xmpyu %fr4,%fr7,%fr8
- ldw -12(%r30),%r19 C least significant limb in product
- ldw -16(%r30),%r28
- fstds %fr8,-16(%r30)
- addib,= -1,%r24,L(end)
- ldw -12(%r30),%r1
- C Main loop
- LDEF(loop)
- fldws,ma 4(%r25),%fr5
- stws,ma %r19,4(%r26)
- addc %r28,%r1,%r19
- xmpyu %fr4,%fr5,%fr6
- ldw -16(%r30),%r28
- fstds %fr6,-16(%r30)
- addib,<> -1,%r24,L(loop)
- ldw -12(%r30),%r1
- LDEF(end)
- stws,ma %r19,4(%r26)
- addc %r28,%r1,%r19
- ldw -16(%r30),%r28
- stws,ma %r19,4(%r26)
- addc %r0,%r28,%r28
- bv 0(%r2)
- ldo -64(%r30),%r30
- LDEF(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)
- EPILOGUE()