sysdeps/hppa/hppa1.1/addmul_1.S

   1 ;! HP-PA-1.1 __mpn_addmul_1 -- Multiply a limb vector with a limb and
   2 ;! add the result to a second limb vector.
   3
   4 ;! Copyright (C) 1992-2015 Free Software Foundation, Inc.
   5
   6 ;! This file is part of the GNU MP Library.
   7
   8 ;! The GNU MP Library is free software; you can redistribute it and/or modify
   9 ;! it under the terms of the GNU Lesser General Public License as published by
  10 ;! the Free Software Foundation; either version 2.1 of the License, or (at your
  11 ;! option) any later version.
  12
  13 ;! The GNU MP Library is distributed in the hope that it will be useful, but
  14 ;! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15 ;! or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  16 ;! License for more details.
  17
  18 ;! You should have received a copy of the GNU Lesser General Public License
  19 ;! along with the GNU MP Library.  If not, see
  20 ;! <http://www.gnu.org/licenses/>.
  21
  22
  23 ;! INPUT PARAMETERS
  24 ;! res_ptr      r26
  25 ;! s1_ptr       r25
  26 ;! size         r24
  27 ;! s2_limb      r23
  28
  29 ;! This runs at 11 cycles/limb on a PA7000.  With the used instructions, it
  30 ;! can not become faster due to data cache contention after a store.  On the
  31 ;! PA7100 it runs at 10 cycles/limb, and that can not be improved either,
  32 ;! since only the xmpyu does not need the integer pipeline, so the only
  33 ;! dual-issue we will get are addc+xmpyu.  Unrolling could gain a cycle/limb
  34 ;! on the PA7100.
  35
  36 ;! There are some ideas described in mul_1.s that applies to this code too.
  37
  38         .text
  39         .export         __mpn_addmul_1
  40 __mpn_addmul_1:
  41         .proc
  42         .callinfo       frame=64,no_calls
  43         .entry
  44
  45         ldo             64(%r30),%r30
  46         fldws,ma        4(%r25),%fr5
  47         stw             %r23,-16(%r30)          ;! move s2_limb ...
  48         addib,=         -1,%r24,L$just_one_limb
  49          fldws          -16(%r30),%fr4          ;! ... into fr4
  50         add             %r0,%r0,%r0             ;! clear carry
  51         xmpyu           %fr4,%fr5,%fr6
  52         fldws,ma        4(%r25),%fr7
  53         fstds           %fr6,-16(%r30)
  54         xmpyu           %fr4,%fr7,%fr8
  55         ldw             -12(%r30),%r20          ;! least significant limb in product
  56         ldw             -16(%r30),%r28
  57
  58         fstds           %fr8,-16(%r30)
  59         addib,=         -1,%r24,L$end
  60          ldw            -12(%r30),%r1
  61
  62 ;! Main loop
  63 L$loop:
  64         ldws            0(%r26),%r29
  65         fldws,ma        4(%r25),%fr5
  66         add             %r29,%r20,%r20
  67         stws,ma         %r20,4(%r26)
  68         addc            %r28,%r1,%r20
  69         xmpyu           %fr4,%fr5,%fr6
  70         ldw             -16(%r30),%r28
  71         fstds           %fr6,-16(%r30)
  72         addc            %r0,%r28,%r28
  73         addib,<>        -1,%r24,L$loop
  74          ldw            -12(%r30),%r1
  75
  76 L$end:
  77         ldw             0(%r26),%r29
  78         add             %r29,%r20,%r20
  79         stws,ma         %r20,4(%r26)
  80         addc            %r28,%r1,%r20
  81         ldw             -16(%r30),%r28
  82         ldws            0(%r26),%r29
  83         addc            %r0,%r28,%r28
  84         add             %r29,%r20,%r20
  85         stws,ma         %r20,4(%r26)
  86         addc            %r0,%r28,%r28
  87         bv              0(%r2)
  88         ldo             -64(%r30),%r30
  89
  90 L$just_one_limb:
  91         xmpyu           %fr4,%fr5,%fr6
  92         ldw             0(%r26),%r29
  93         fstds           %fr6,-16(%r30)
  94         ldw             -12(%r30),%r1
  95         ldw             -16(%r30),%r28
  96         add             %r29,%r1,%r20
  97         stw             %r20,0(%r26)
  98         addc            %r0,%r28,%r28
  99         bv              0(%r2)
 100          ldo            -64(%r30),%r30
 101
 102         .exit
 103         .procend