submul_1.asm
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上传日期:2022-08-06
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- dnl HP-PA 1.1 mpn_submul_1 -- Multiply a limb vector with a limb and subtract
- dnl the result from 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 12 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 11 cycles/limb.
- C There are some ideas described in mul_1.asm that applies to this code too.
- C It seems possible to make this run as fast as mpn_addmul_1, if we use
- C sub,>>= %r29,%r19,%r22
- C addi 1,%r28,%r28
- C but that requires reworking the hairy software pipeline...
- ASM_START()
- PROLOGUE(mpn_submul_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)
- ldws 0(%r26),%r29
- fldws,ma 4(%r25),%fr5
- sub %r29,%r19,%r22
- add %r22,%r19,%r0
- stws,ma %r22,4(%r26)
- addc %r28,%r1,%r19
- xmpyu %fr4,%fr5,%fr6
- ldw -16(%r30),%r28
- fstds %fr6,-16(%r30)
- addc %r0,%r28,%r28
- addib,<> -1,%r24,L(loop)
- ldw -12(%r30),%r1
- LDEF(end)
- ldw 0(%r26),%r29
- sub %r29,%r19,%r22
- add %r22,%r19,%r0
- stws,ma %r22,4(%r26)
- addc %r28,%r1,%r19
- ldw -16(%r30),%r28
- ldws 0(%r26),%r29
- addc %r0,%r28,%r28
- sub %r29,%r19,%r22
- add %r22,%r19,%r0
- stws,ma %r22,4(%r26)
- addc %r0,%r28,%r28
- bv 0(%r2)
- ldo -64(%r30),%r30
- LDEF(just_one_limb)
- xmpyu %fr4,%fr5,%fr6
- ldw 0(%r26),%r29
- fstds %fr6,-16(%r30)
- ldw -12(%r30),%r1
- ldw -16(%r30),%r28
- sub %r29,%r1,%r22
- add %r22,%r1,%r0
- stw %r22,0(%r26)
- addc %r0,%r28,%r28
- bv 0(%r2)
- ldo -64(%r30),%r30
- EPILOGUE()