120 lines
2.4 KiB
NASM
120 lines
2.4 KiB
NASM
dnl Alpha mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
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dnl store difference in a third limb vector.
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dnl Copyright 1995, 2000, 2002, 2005 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C cycles/limb
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C EV4: 7.75
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C EV5: 5.75
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C EV6: 4
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C INPUT PARAMETERS
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C rp r16
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C up r17
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C vp r18
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C n r19
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ASM_START()
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PROLOGUE(mpn_sub_n)
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ldq r3,0(r17)
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ldq r4,0(r18)
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subq r19,1,r19
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and r19,4-1,r2 C number of limbs in first loop
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bis r31,r31,r0
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beq r2,$L0 C if multiple of 4 limbs, skip first loop
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subq r19,r2,r19
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$Loop0: subq r2,1,r2
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ldq r5,8(r17)
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addq r4,r0,r4
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ldq r6,8(r18)
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cmpult r4,r0,r1
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subq r3,r4,r4
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cmpult r3,r4,r0
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stq r4,0(r16)
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bis r0,r1,r0
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addq r17,8,r17
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addq r18,8,r18
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bis r5,r5,r3
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bis r6,r6,r4
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addq r16,8,r16
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bne r2,$Loop0
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$L0: beq r19,$Lend
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ALIGN(8)
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$Loop: subq r19,4,r19
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ldq r5,8(r17)
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addq r4,r0,r4
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ldq r6,8(r18)
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cmpult r4,r0,r1
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subq r3,r4,r4
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cmpult r3,r4,r0
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stq r4,0(r16)
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bis r0,r1,r0
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ldq r3,16(r17)
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addq r6,r0,r6
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ldq r4,16(r18)
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cmpult r6,r0,r1
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subq r5,r6,r6
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cmpult r5,r6,r0
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stq r6,8(r16)
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bis r0,r1,r0
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ldq r5,24(r17)
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addq r4,r0,r4
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ldq r6,24(r18)
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cmpult r4,r0,r1
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subq r3,r4,r4
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cmpult r3,r4,r0
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stq r4,16(r16)
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bis r0,r1,r0
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ldq r3,32(r17)
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addq r6,r0,r6
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ldq r4,32(r18)
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cmpult r6,r0,r1
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subq r5,r6,r6
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cmpult r5,r6,r0
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stq r6,24(r16)
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bis r0,r1,r0
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addq r17,32,r17
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addq r18,32,r18
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addq r16,32,r16
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bne r19,$Loop
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$Lend: addq r4,r0,r4
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cmpult r4,r0,r1
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subq r3,r4,r4
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cmpult r3,r4,r0
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stq r4,0(r16)
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bis r0,r1,r0
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ret r31,(r26),1
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EPILOGUE(mpn_sub_n)
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ASM_END()
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