diff options
Diffstat (limited to 'rts/gmp/mpn/a29k/rshift.s')
| -rw-r--r-- | rts/gmp/mpn/a29k/rshift.s | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/rts/gmp/mpn/a29k/rshift.s b/rts/gmp/mpn/a29k/rshift.s new file mode 100644 index 0000000000..ea163bff2b --- /dev/null +++ b/rts/gmp/mpn/a29k/rshift.s @@ -0,0 +1,89 @@ +; 29000 __gmpn_rshift -- + +; Copyright (C) 1992, 1994, 2000 Free Software Foundation, Inc. + +; 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 Lesser General Public License as published by +; the Free Software Foundation; either version 2.1 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 Lesser General Public +; License for more details. + +; You should have received a copy of the GNU Lesser 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 lr2 +; s1_ptr lr3 +; s2_ptr lr4 +; size lr5 + +; We use the loadm/storem instructions and operate on chunks of 8 +; limbs/per iteration, until less than 8 limbs remain. + + .sect .lit,lit + .text + .align 4 + .global ___gmpn_rshift + .word 0x60000 +___gmpn_rshift: + load 0,0,gr119,lr3 + add lr3,lr3,4 + + subr gr116,lr5,32 + sll gr96,gr119,gr116 ; return value + sub lr4,lr4,1 ; actual loop count is SIZE - 1 + + srl gr117,lr4,3 ; chuck count = (actual count) / 8 + cpeq gr118,gr117,0 + jmpt gr118,Ltail + mtsr fc,gr116 + + sub gr117,gr117,2 ; count for jmpfdec + +; Main loop working 8 limbs/iteration. +Loop: mtsrim cr,(8-1) + loadm 0,0,gr100,lr3 + add lr3,lr3,32 + + extract gr98,gr100,gr119 + extract gr99,gr101,gr100 + extract gr100,gr102,gr101 + extract gr101,gr103,gr102 + extract gr102,gr104,gr103 + extract gr103,gr105,gr104 + extract gr104,gr106,gr105 + extract gr105,gr107,gr106 + + mtsrim cr,(8-1) + storem 0,0,gr98,lr2 + add lr2,lr2,32 + jmpfdec gr117,Loop + or gr119,gr107,0 + +; Code for the last up-to-7 limbs. + + and lr4,lr4,(8-1) +Ltail: cpeq gr118,lr4,0 + jmpt gr118,Lend + sub lr4,lr4,2 ; count for jmpfdec + +Loop2: load 0,0,gr100,lr3 + add lr3,lr3,4 + extract gr117,gr100,gr119 + store 0,0,gr117,lr2 + add lr2,lr2,4 + jmpfdec lr4,Loop2 + or gr119,gr100,0 + +Lend: srl gr117,gr119,lr5 + jmpi lr0 + store 0,0,gr117,lr2 |