diff options
Diffstat (limited to 'sysdeps/hppa/hppa1.1/mul_1.s')
| -rw-r--r-- | sysdeps/hppa/hppa1.1/mul_1.s | 100 |
1 files changed, 51 insertions, 49 deletions
diff --git a/sysdeps/hppa/hppa1.1/mul_1.s b/sysdeps/hppa/hppa1.1/mul_1.s index cdd0c1d7fa..7f53916e83 100644 --- a/sysdeps/hppa/hppa1.1/mul_1.s +++ b/sysdeps/hppa/hppa1.1/mul_1.s @@ -1,92 +1,94 @@ -; HP-PA-1.1 __mpn_mul_1 -- Multiply a limb vector with a limb and store -; the result in a second limb vector. +;! 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. +;! Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc. -; This file is part of the GNU MP Library. +;! 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 Library General Public License as published by -; the Free Software Foundation; either version 2 of the License, or (at your -; option) any later version. +;! The GNU MP Library is free software; you can redistribute it and/or modify +;! it under the terms of the GNU Library General Public License as published by +;! the Free Software Foundation; either version 2 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 Library General Public -; License for more details. +;! 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 Library General Public +;! License for more details. -; You should have received a copy of the GNU Library 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. +;! You should have received a copy of the GNU Library 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 +;! 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. +;! 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... +;! 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.) +;! 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.) - .code + .text .export __mpn_mul_1 -__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 ... + stw %r23,-16(%r30) ;! move s2_limb ... addib,= -1,%r24,L$just_one_limb - fldws -16(%r30),%fr4 ; ... into fr4 - add %r0,%r0,%r0 ; clear carry + fldws -16(%r30),%fr4 ;! ... into fr4 + add %r0,%r0,%r0 ;! clear carry xmpyu %fr4,%fr5,%fr6 fldws,ma 4(%r25),%fr7 fstds %fr6,-16(%r30) xmpyu %fr4,%fr7,%fr8 - ldw -12(%r30),%r19 ; least significant limb in product + ldw -12(%r30),%r20 ;! least significant limb in product ldw -16(%r30),%r28 fstds %fr8,-16(%r30) addib,= -1,%r24,L$end ldw -12(%r30),%r1 -; Main loop -L$loop fldws,ma 4(%r25),%fr5 - stws,ma %r19,4(%r26) - addc %r28,%r1,%r19 +;! Main loop +L$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 %r19,4(%r26) - addc %r28,%r1,%r19 +L$end: + stws,ma %r20,4(%r26) + addc %r28,%r1,%r20 ldw -16(%r30),%r28 - stws,ma %r19,4(%r26) + stws,ma %r20,4(%r26) addc %r0,%r28,%r28 bv 0(%r2) ldo -64(%r30),%r30 -L$just_one_limb +L$just_one_limb: xmpyu %fr4,%fr5,%fr6 fstds %fr6,-16(%r30) ldw -16(%r30),%r28 |