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authorRoland McGrath <roland@gnu.org>1996-03-01 18:45:35 +0000
committerRoland McGrath <roland@gnu.org>1996-03-01 18:45:35 +0000
commit6b628d3634559ddd84148ed860a0e1e967b5d59c (patch)
tree59e9370cd3fdf04ebe25ce605465f9057e24e081 /sysdeps/alpha/alphaev5/sub_n.s
parentbc47d7a85be6334801853aaee489c875646ecb00 (diff)
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* stdlib/Makefile (mpn-stuff): New target.
(copy-mpn): Use it. * Code copied from GMP updated to 1.937 version. * stdlib/strtod.c (HAVE_ALLOCA): Define this for gmp headers.
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+ # Alpha __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
+ # store difference in a third limb vector.
+
+ # Copyright (C) 1995 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 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.
+
+ # 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+ # INPUT PARAMETERS
+ # res_ptr $16
+ # s1_ptr $17
+ # s2_ptr $18
+ # size $19
+
+ .set noreorder
+ .set noat
+.text
+ .align 3
+ .globl __mpn_sub_n
+ .ent __mpn_sub_n
+__mpn_sub_n:
+ .frame $30,0,$26,0
+
+ or $31,$31,$25 # clear cy
+ subq $19,4,$19 # decr loop cnt
+ blt $19,.Lend2 # if less than 4 limbs, goto 2nd loop
+ # Start software pipeline for 1st loop
+ ldq $0,0($18)
+ ldq $1,8($18)
+ ldq $4,0($17)
+ ldq $5,8($17)
+ addq $17,32,$17 # update s1_ptr
+ ldq $2,16($18)
+ subq $4,$0,$20 # 1st main sub
+ ldq $3,24($18)
+ subq $19,4,$19 # decr loop cnt
+ ldq $6,-16($17)
+ cmpult $4,$20,$25 # compute cy from last sub
+ ldq $7,-8($17)
+ addq $1,$25,$28 # cy add
+ addq $18,32,$18 # update s2_ptr
+ subq $5,$28,$21 # 2nd main sub
+ cmpult $28,$25,$8 # compute cy from last add
+ blt $19,.Lend1 # if less than 4 limbs remain, jump
+ # 1st loop handles groups of 4 limbs in a software pipeline
+ .align 4
+.Loop: cmpult $5,$21,$25 # compute cy from last add
+ ldq $0,0($18)
+ or $8,$25,$25 # combine cy from the two adds
+ ldq $1,8($18)
+ addq $2,$25,$28 # cy add
+ ldq $4,0($17)
+ subq $6,$28,$22 # 3rd main sub
+ ldq $5,8($17)
+ cmpult $28,$25,$8 # compute cy from last add
+ cmpult $6,$22,$25 # compute cy from last add
+ stq $20,0($16)
+ or $8,$25,$25 # combine cy from the two adds
+ stq $21,8($16)
+ addq $3,$25,$28 # cy add
+ subq $7,$28,$23 # 4th main sub
+ cmpult $28,$25,$8 # compute cy from last add
+ cmpult $7,$23,$25 # compute cy from last add
+ addq $17,32,$17 # update s1_ptr
+ or $8,$25,$25 # combine cy from the two adds
+ addq $16,32,$16 # update res_ptr
+ addq $0,$25,$28 # cy add
+ ldq $2,16($18)
+ subq $4,$28,$20 # 1st main sub
+ ldq $3,24($18)
+ cmpult $28,$25,$8 # compute cy from last add
+ ldq $6,-16($17)
+ cmpult $4,$20,$25 # compute cy from last add
+ ldq $7,-8($17)
+ or $8,$25,$25 # combine cy from the two adds
+ subq $19,4,$19 # decr loop cnt
+ stq $22,-16($16)
+ addq $1,$25,$28 # cy add
+ stq $23,-8($16)
+ subq $5,$28,$21 # 2nd main sub
+ addq $18,32,$18 # update s2_ptr
+ cmpult $28,$25,$8 # compute cy from last add
+ bge $19,.Loop
+ # Finish software pipeline for 1st loop
+.Lend1: cmpult $5,$21,$25 # compute cy from last add
+ or $8,$25,$25 # combine cy from the two adds
+ addq $2,$25,$28 # cy add
+ subq $6,$28,$22 # 3rd main sub
+ cmpult $28,$25,$8 # compute cy from last add
+ cmpult $6,$22,$25 # compute cy from last add
+ stq $20,0($16)
+ or $8,$25,$25 # combine cy from the two adds
+ stq $21,8($16)
+ addq $3,$25,$28 # cy add
+ subq $7,$28,$23 # 4th main sub
+ cmpult $28,$25,$8 # compute cy from last add
+ cmpult $7,$23,$25 # compute cy from last add
+ or $8,$25,$25 # combine cy from the two adds
+ addq $16,32,$16 # update res_ptr
+ stq $22,-16($16)
+ stq $23,-8($16)
+.Lend2: addq $19,4,$19 # restore loop cnt
+ beq $19,.Lret
+ # Start software pipeline for 2nd loop
+ ldq $0,0($18)
+ ldq $4,0($17)
+ subq $19,1,$19
+ beq $19,.Lend0
+ # 2nd loop handles remaining 1-3 limbs
+ .align 4
+.Loop0: addq $0,$25,$28 # cy add
+ ldq $0,8($18)
+ subq $4,$28,$20 # main sub
+ ldq $1,8($17)
+ addq $18,8,$18
+ cmpult $28,$25,$8 # compute cy from last add
+ addq $17,8,$17
+ stq $20,0($16)
+ cmpult $4,$20,$25 # compute cy from last add
+ subq $19,1,$19 # decr loop cnt
+ or $8,$25,$25 # combine cy from the two adds
+ addq $16,8,$16
+ or $1,$31,$4
+ bne $19,.Loop0
+.Lend0: addq $0,$25,$28 # cy add
+ subq $4,$28,$20 # main sub
+ cmpult $28,$25,$8 # compute cy from last add
+ cmpult $4,$20,$25 # compute cy from last add
+ stq $20,0($16)
+ or $8,$25,$25 # combine cy from the two adds
+
+.Lret: or $25,$31,$0 # return cy
+ ret $31,($26),1
+ .end __mpn_sub_n