184 lines
3.1 KiB
NASM
184 lines
3.1 KiB
NASM
dnl Intel P5 mpn_mod_34lsub1 -- mpn remainder modulo 2**24-1.
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dnl Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
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dnl
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or
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dnl modify it under the terms of the GNU Lesser General Public License as
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dnl published by the Free Software Foundation; either version 2.1 of the
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dnl License, or (at your option) any later version.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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dnl Lesser General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU Lesser General Public
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dnl License along with the GNU MP Library; see the file COPYING.LIB. If
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dnl not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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dnl Fifth Floor, Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C P5: 1.66 cycles/limb
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C mp_limb_t mpn_mod_34lsub1 (mp_srcptr src, mp_size_t size)
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C
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defframe(PARAM_SIZE, 8)
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defframe(PARAM_SRC, 4)
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TEXT
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ALIGN(16)
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PROLOGUE(mpn_mod_34lsub1)
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deflit(`FRAME',0)
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movl PARAM_SIZE, %ecx
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movl PARAM_SRC, %edx
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subl $2, %ecx
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ja L(three_or_more)
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movl (%edx), %eax
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jne L(one)
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movl 4(%edx), %ecx
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movl %eax, %edx
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shrl $24, %edx
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andl $0xFFFFFF, %eax
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addl %edx, %eax
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movl %ecx, %edx
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shrl $16, %ecx
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andl $0xFFFF, %edx
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shll $8, %edx
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addl %ecx, %eax
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addl %edx, %eax
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L(one):
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ret
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L(three_or_more):
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C eax
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C ebx
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C ecx size-2
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C edx src
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C esi
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C edi
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C ebp
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pushl %ebx FRAME_pushl()
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pushl %esi FRAME_pushl()
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pushl %edi FRAME_pushl()
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pushl %ebp FRAME_pushl()
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xorl %esi, %esi C 0mod3
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xorl %edi, %edi C 1mod3
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xorl %ebp, %ebp C 2mod3, and clear carry
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L(top):
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C eax scratch
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C ebx scratch
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C ecx counter, limbs
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C edx src
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C esi 0mod3
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C edi 1mod3
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C ebp 2mod3
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movl (%edx), %eax
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movl 4(%edx), %ebx
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adcl %eax, %esi
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movl 8(%edx), %eax
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adcl %ebx, %edi
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leal 12(%edx), %edx
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adcl %eax, %ebp
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leal -2(%ecx), %ecx
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decl %ecx
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jg L(top)
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C ecx is -2, -1 or 0, representing 0, 1 or 2 more limbs, respectively
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movl $0xFFFFFFFF, %ebx C mask
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incl %ecx
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js L(combine) C 0 more
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movl (%edx), %eax
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movl $0xFFFFFF00, %ebx
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adcl %eax, %esi
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decl %ecx
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js L(combine) C 1 more
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movl 4(%edx), %eax
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movl $0xFFFF0000, %ebx
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adcl %eax, %edi
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L(combine):
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C eax
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C ebx mask
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C ecx
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C edx
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C esi 0mod3
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C edi 1mod3
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C ebp 2mod3
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sbbl %ecx, %ecx C carry
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movl %esi, %eax C 0mod3
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andl %ebx, %ecx C masked for position
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andl $0xFFFFFF, %eax C 0mod3 low
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shrl $24, %esi C 0mod3 high
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subl %ecx, %eax C apply carry
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addl %esi, %eax C apply 0mod3
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movl %edi, %ebx C 1mod3
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shrl $16, %edi C 1mod3 high
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andl $0x0000FFFF, %ebx
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shll $8, %ebx C 1mod3 low
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addl %edi, %eax C apply 1mod3 high
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addl %ebx, %eax C apply 1mod3 low
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movl %ebp, %ebx C 2mod3
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shrl $8, %ebp C 2mod3 high
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andl $0xFF, %ebx
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shll $16, %ebx C 2mod3 low
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addl %ebp, %eax C apply 2mod3 high
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addl %ebx, %eax C apply 2mod3 low
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popl %ebp
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popl %edi
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popl %esi
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popl %ebx
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ret
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EPILOGUE()
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