diff options
Diffstat (limited to 'gmp-6.3.0/mpn/pa32/hppa1_1/submul_1.asm')
| -rw-r--r-- | gmp-6.3.0/mpn/pa32/hppa1_1/submul_1.asm | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/gmp-6.3.0/mpn/pa32/hppa1_1/submul_1.asm b/gmp-6.3.0/mpn/pa32/hppa1_1/submul_1.asm new file mode 100644 index 0000000..a9b11d2 --- /dev/null +++ b/gmp-6.3.0/mpn/pa32/hppa1_1/submul_1.asm @@ -0,0 +1,115 @@ +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 1992-1994, 2000-2002 Free Software Foundation, Inc. + +dnl This file is part of the GNU MP Library. +dnl +dnl The GNU MP Library is free software; you can redistribute it and/or modify +dnl it under the terms of either: +dnl +dnl * the GNU Lesser General Public License as published by the Free +dnl Software Foundation; either version 3 of the License, or (at your +dnl option) any later version. +dnl +dnl or +dnl +dnl * the GNU General Public License as published by the Free Software +dnl Foundation; either version 2 of the License, or (at your option) any +dnl later version. +dnl +dnl or both in parallel, as here. +dnl +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 General Public License +dnl for more details. +dnl +dnl You should have received copies of the GNU General Public License and the +dnl GNU Lesser General Public License along with the GNU MP Library. If not, +dnl see https://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() |