Annotation of OpenXM_contrib/gmp/mpn/alpha/ev5/sub_n.asm, Revision 1.1
1.1 ! maekawa 1: dnl Alpha EV5 __gmpn_sub_n -- Subtract two limb vectors of the same length > 0
! 2: dnl and store difference in a third limb vector.
! 3:
! 4: dnl Copyright (C) 1995, 1999, 2000 Free Software Foundation, Inc.
! 5:
! 6: dnl This file is part of the GNU MP Library.
! 7:
! 8: dnl The GNU MP Library is free software; you can redistribute it and/or modify
! 9: dnl it under the terms of the GNU Lesser General Public License as published by
! 10: dnl the Free Software Foundation; either version 2.1 of the License, or (at your
! 11: dnl option) any later version.
! 12:
! 13: dnl The GNU MP Library is distributed in the hope that it will be useful, but
! 14: dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 15: dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
! 16: dnl License for more details.
! 17:
! 18: dnl You should have received a copy of the GNU Lesser General Public License
! 19: dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write to
! 20: dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
! 21: dnl MA 02111-1307, USA.
! 22:
! 23: include(`../config.m4')
! 24:
! 25: dnl INPUT PARAMETERS
! 26: dnl res_ptr r16
! 27: dnl s1_ptr r17
! 28: dnl s2_ptr r18
! 29: dnl size r19
! 30:
! 31: ASM_START()
! 32: PROLOGUE(mpn_sub_n)
! 33: bis r31,r31,r25 C clear cy
! 34: subq r19,4,r19 C decr loop cnt
! 35: blt r19,$Lend2 C if less than 4 limbs, goto 2nd loop
! 36: C Start software pipeline for 1st loop
! 37: ldq r0,0(r18)
! 38: ldq r4,0(r17)
! 39: ldq r1,8(r18)
! 40: ldq r5,8(r17)
! 41: addq r17,32,r17 C update s1_ptr
! 42: ldq r2,16(r18)
! 43: subq r4,r0,r20 C 1st main subtract
! 44: ldq r3,24(r18)
! 45: subq r19,4,r19 C decr loop cnt
! 46: ldq r6,-16(r17)
! 47: cmpult r4,r0,r25 C compute cy from last subtract
! 48: ldq r7,-8(r17)
! 49: subq r5,r1,r28 C 2nd main subtract
! 50: addq r18,32,r18 C update s2_ptr
! 51: subq r28,r25,r21 C 2nd carry subtract
! 52: cmpult r5,r1,r8 C compute cy from last subtract
! 53: blt r19,$Lend1 C if less than 4 limbs remain, jump
! 54: C 1st loop handles groups of 4 limbs in a software pipeline
! 55: ALIGN(16)
! 56: $Loop: cmpult r28,r25,r25 C compute cy from last subtract
! 57: ldq r0,0(r18)
! 58: bis r8,r25,r25 C combine cy from the two subtracts
! 59: ldq r1,8(r18)
! 60: subq r6,r2,r28 C 3rd main subtract
! 61: ldq r4,0(r17)
! 62: subq r28,r25,r22 C 3rd carry subtract
! 63: ldq r5,8(r17)
! 64: cmpult r6,r2,r8 C compute cy from last subtract
! 65: cmpult r28,r25,r25 C compute cy from last subtract
! 66: stq r20,0(r16)
! 67: bis r8,r25,r25 C combine cy from the two subtracts
! 68: stq r21,8(r16)
! 69: subq r7,r3,r28 C 4th main subtract
! 70: subq r28,r25,r23 C 4th carry subtract
! 71: cmpult r7,r3,r8 C compute cy from last subtract
! 72: cmpult r28,r25,r25 C compute cy from last subtract
! 73: addq r17,32,r17 C update s1_ptr
! 74: bis r8,r25,r25 C combine cy from the two subtracts
! 75: addq r16,32,r16 C update res_ptr
! 76: subq r4,r0,r28 C 1st main subtract
! 77: ldq r2,16(r18)
! 78: subq r28,r25,r20 C 1st carry subtract
! 79: ldq r3,24(r18)
! 80: cmpult r4,r0,r8 C compute cy from last subtract
! 81: ldq r6,-16(r17)
! 82: cmpult r28,r25,r25 C compute cy from last subtract
! 83: ldq r7,-8(r17)
! 84: bis r8,r25,r25 C combine cy from the two subtracts
! 85: subq r19,4,r19 C decr loop cnt
! 86: stq r22,-16(r16)
! 87: subq r5,r1,r28 C 2nd main subtract
! 88: stq r23,-8(r16)
! 89: subq r28,r25,r21 C 2nd carry subtract
! 90: addq r18,32,r18 C update s2_ptr
! 91: cmpult r5,r1,r8 C compute cy from last subtract
! 92: bge r19,$Loop
! 93: C Finish software pipeline for 1st loop
! 94: $Lend1: cmpult r28,r25,r25 C compute cy from last subtract
! 95: bis r8,r25,r25 C combine cy from the two subtracts
! 96: subq r6,r2,r28 C cy add
! 97: subq r28,r25,r22 C 3rd main subtract
! 98: cmpult r6,r2,r8 C compute cy from last subtract
! 99: cmpult r28,r25,r25 C compute cy from last subtract
! 100: stq r20,0(r16)
! 101: bis r8,r25,r25 C combine cy from the two subtracts
! 102: stq r21,8(r16)
! 103: subq r7,r3,r28 C cy add
! 104: subq r28,r25,r23 C 4th main subtract
! 105: cmpult r7,r3,r8 C compute cy from last subtract
! 106: cmpult r28,r25,r25 C compute cy from last subtract
! 107: bis r8,r25,r25 C combine cy from the two subtracts
! 108: addq r16,32,r16 C update res_ptr
! 109: stq r22,-16(r16)
! 110: stq r23,-8(r16)
! 111: $Lend2: addq r19,4,r19 C restore loop cnt
! 112: beq r19,$Lret
! 113: C Start software pipeline for 2nd loop
! 114: ldq r0,0(r18)
! 115: ldq r4,0(r17)
! 116: subq r19,1,r19
! 117: beq r19,$Lend0
! 118: C 2nd loop handles remaining 1-3 limbs
! 119: ALIGN(16)
! 120: $Loop0: subq r4,r0,r28 C main subtract
! 121: cmpult r4,r0,r8 C compute cy from last subtract
! 122: ldq r0,8(r18)
! 123: ldq r4,8(r17)
! 124: subq r28,r25,r20 C carry subtract
! 125: addq r18,8,r18
! 126: addq r17,8,r17
! 127: stq r20,0(r16)
! 128: cmpult r28,r25,r25 C compute cy from last subtract
! 129: subq r19,1,r19 C decr loop cnt
! 130: bis r8,r25,r25 C combine cy from the two subtracts
! 131: addq r16,8,r16
! 132: bne r19,$Loop0
! 133: $Lend0: subq r4,r0,r28 C main subtract
! 134: subq r28,r25,r20 C carry subtract
! 135: cmpult r4,r0,r8 C compute cy from last subtract
! 136: cmpult r28,r25,r25 C compute cy from last subtract
! 137: stq r20,0(r16)
! 138: bis r8,r25,r25 C combine cy from the two subtracts
! 139:
! 140: $Lret: bis r25,r31,r0 C return cy
! 141: ret r31,(r26),1
! 142: EPILOGUE(mpn_sub_n)
! 143: ASM_END()
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