+++ /dev/null
-dnl Alpha EV5 __gmpn_sub_n -- Subtract two limb vectors of the same length > 0
-dnl and store difference in a third limb vector.
-
-dnl Copyright (C) 1995, 1999, 2000 Free Software Foundation, Inc.
-
-dnl This file is part of the GNU MP Library.
-
-dnl The GNU MP Library is free software; you can redistribute it and/or modify
-dnl it under the terms of the GNU Lesser General Public License as published by
-dnl the Free Software Foundation; either version 2.1 of the License, or (at your
-dnl option) any later version.
-
-dnl The GNU MP Library is distributed in the hope that it will be useful, but
-dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
-dnl License for more details.
-
-dnl You should have received a copy of the GNU Lesser General Public License
-dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write to
-dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
-dnl MA 02111-1307, USA.
-
-include(`../config.m4')
-
-dnl INPUT PARAMETERS
-dnl res_ptr r16
-dnl s1_ptr r17
-dnl s2_ptr r18
-dnl size r19
-
-ASM_START()
-PROLOGUE(mpn_sub_n)
- bis r31,r31,r25 C clear cy
- subq r19,4,r19 C decr loop cnt
- blt r19,$Lend2 C if less than 4 limbs, goto 2nd loop
-C Start software pipeline for 1st loop
- ldq r0,0(r18)
- ldq r4,0(r17)
- ldq r1,8(r18)
- ldq r5,8(r17)
- addq r17,32,r17 C update s1_ptr
- ldq r2,16(r18)
- subq r4,r0,r20 C 1st main subtract
- ldq r3,24(r18)
- subq r19,4,r19 C decr loop cnt
- ldq r6,-16(r17)
- cmpult r4,r0,r25 C compute cy from last subtract
- ldq r7,-8(r17)
- subq r5,r1,r28 C 2nd main subtract
- addq r18,32,r18 C update s2_ptr
- subq r28,r25,r21 C 2nd carry subtract
- cmpult r5,r1,r8 C compute cy from last subtract
- blt r19,$Lend1 C if less than 4 limbs remain, jump
-C 1st loop handles groups of 4 limbs in a software pipeline
- ALIGN(16)
-$Loop: cmpult r28,r25,r25 C compute cy from last subtract
- ldq r0,0(r18)
- bis r8,r25,r25 C combine cy from the two subtracts
- ldq r1,8(r18)
- subq r6,r2,r28 C 3rd main subtract
- ldq r4,0(r17)
- subq r28,r25,r22 C 3rd carry subtract
- ldq r5,8(r17)
- cmpult r6,r2,r8 C compute cy from last subtract
- cmpult r28,r25,r25 C compute cy from last subtract
- stq r20,0(r16)
- bis r8,r25,r25 C combine cy from the two subtracts
- stq r21,8(r16)
- subq r7,r3,r28 C 4th main subtract
- subq r28,r25,r23 C 4th carry subtract
- cmpult r7,r3,r8 C compute cy from last subtract
- cmpult r28,r25,r25 C compute cy from last subtract
- addq r17,32,r17 C update s1_ptr
- bis r8,r25,r25 C combine cy from the two subtracts
- addq r16,32,r16 C update res_ptr
- subq r4,r0,r28 C 1st main subtract
- ldq r2,16(r18)
- subq r28,r25,r20 C 1st carry subtract
- ldq r3,24(r18)
- cmpult r4,r0,r8 C compute cy from last subtract
- ldq r6,-16(r17)
- cmpult r28,r25,r25 C compute cy from last subtract
- ldq r7,-8(r17)
- bis r8,r25,r25 C combine cy from the two subtracts
- subq r19,4,r19 C decr loop cnt
- stq r22,-16(r16)
- subq r5,r1,r28 C 2nd main subtract
- stq r23,-8(r16)
- subq r28,r25,r21 C 2nd carry subtract
- addq r18,32,r18 C update s2_ptr
- cmpult r5,r1,r8 C compute cy from last subtract
- bge r19,$Loop
-C Finish software pipeline for 1st loop
-$Lend1: cmpult r28,r25,r25 C compute cy from last subtract
- bis r8,r25,r25 C combine cy from the two subtracts
- subq r6,r2,r28 C cy add
- subq r28,r25,r22 C 3rd main subtract
- cmpult r6,r2,r8 C compute cy from last subtract
- cmpult r28,r25,r25 C compute cy from last subtract
- stq r20,0(r16)
- bis r8,r25,r25 C combine cy from the two subtracts
- stq r21,8(r16)
- subq r7,r3,r28 C cy add
- subq r28,r25,r23 C 4th main subtract
- cmpult r7,r3,r8 C compute cy from last subtract
- cmpult r28,r25,r25 C compute cy from last subtract
- bis r8,r25,r25 C combine cy from the two subtracts
- addq r16,32,r16 C update res_ptr
- stq r22,-16(r16)
- stq r23,-8(r16)
-$Lend2: addq r19,4,r19 C restore loop cnt
- beq r19,$Lret
-C Start software pipeline for 2nd loop
- ldq r0,0(r18)
- ldq r4,0(r17)
- subq r19,1,r19
- beq r19,$Lend0
-C 2nd loop handles remaining 1-3 limbs
- ALIGN(16)
-$Loop0: subq r4,r0,r28 C main subtract
- cmpult r4,r0,r8 C compute cy from last subtract
- ldq r0,8(r18)
- ldq r4,8(r17)
- subq r28,r25,r20 C carry subtract
- addq r18,8,r18
- addq r17,8,r17
- stq r20,0(r16)
- cmpult r28,r25,r25 C compute cy from last subtract
- subq r19,1,r19 C decr loop cnt
- bis r8,r25,r25 C combine cy from the two subtracts
- addq r16,8,r16
- bne r19,$Loop0
-$Lend0: subq r4,r0,r28 C main subtract
- subq r28,r25,r20 C carry subtract
- cmpult r4,r0,r8 C compute cy from last subtract
- cmpult r28,r25,r25 C compute cy from last subtract
- stq r20,0(r16)
- bis r8,r25,r25 C combine cy from the two subtracts
-
-$Lret: bis r25,r31,r0 C return cy
- ret r31,(r26),1
-EPILOGUE(mpn_sub_n)
-ASM_END()
projects / ghc-hetmet.git / blobdiff