+++ /dev/null
-; 29000 __gmpn_sub -- Subtract two limb vectors of the same length > 0 and
-; store difference in a third limb vector.
-
-; 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.
-
-; The 29k has no addition or subtraction instructions that doesn't
-; affect carry, so we need to save and restore that as soon as we
-; adjust the pointers. gr116 is used for this purpose. Note that
-; gr116==0 means that carry should be set.
-
- .sect .lit,lit
- .text
- .align 4
- .global ___gmpn_sub_n
- .word 0x60000
-___gmpn_sub_n:
- srl gr117,lr5,3
- sub gr118,gr117,1
- jmpt gr118,Ltail
- constn gr116,-1 ; init cy reg
- sub gr117,gr117,2 ; count for jmpfdec
-
-; Main loop working 8 limbs/iteration.
-Loop: mtsrim cr,(8-1)
- loadm 0,0,gr96,lr3
- add lr3,lr3,32
- mtsrim cr,(8-1)
- loadm 0,0,gr104,lr4
- add lr4,lr4,32
-
- subr gr116,gr116,0 ; restore carry
- subc gr96,gr96,gr104
- subc gr97,gr97,gr105
- subc gr98,gr98,gr106
- subc gr99,gr99,gr107
- subc gr100,gr100,gr108
- subc gr101,gr101,gr109
- subc gr102,gr102,gr110
- subc gr103,gr103,gr111
- subc gr116,gr116,gr116 ; gr116 = not(cy)
-
- mtsrim cr,(8-1)
- storem 0,0,gr96,lr2
- jmpfdec gr117,Loop
- add lr2,lr2,32
-
-; Code for the last up-to-7 limbs.
-; This code might look very strange, but it's hard to write it
-; differently without major slowdown.
-
- and lr5,lr5,(8-1)
-Ltail: sub gr118,lr5,1 ; count for CR
- jmpt gr118,Lend
- sub gr117,lr5,2 ; count for jmpfdec
-
- mtsr cr,gr118
- loadm 0,0,gr96,lr3
- mtsr cr,gr118
- loadm 0,0,gr104,lr4
-
- subr gr116,gr116,0 ; restore carry
-
- jmpfdec gr117,L1
- subc gr96,gr96,gr104
- jmp Lstore
- mtsr cr,gr118
-L1: jmpfdec gr117,L2
- subc gr97,gr97,gr105
- jmp Lstore
- mtsr cr,gr118
-L2: jmpfdec gr117,L3
- subc gr98,gr98,gr106
- jmp Lstore
- mtsr cr,gr118
-L3: jmpfdec gr117,L4
- subc gr99,gr99,gr107
- jmp Lstore
- mtsr cr,gr118
-L4: jmpfdec gr117,L5
- subc gr100,gr100,gr108
- jmp Lstore
- mtsr cr,gr118
-L5: jmpfdec gr117,L6
- subc gr101,gr101,gr109
- jmp Lstore
- mtsr cr,gr118
-L6: subc gr102,gr102,gr110
-
-Lstore: storem 0,0,gr96,lr2
- subc gr116,gr116,gr116 ; gr116 = not(cy)
-
-Lend: jmpi lr0
- add gr96,gr116,1