2009-10-05 10:19:08 -04:00
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dnl mpn_mod_1_2
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dnl Copyright 2009 Jason Moxham
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dnl This file is part of the MPIR Library.
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dnl The MPIR 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 MPIR 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 MPIR 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 (rdi,2)= not fully reduced remainder of (rsi,rdx) / divisor , and top limb <d
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C where (rcx,3) contains B^i % divisor
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ASM_START()
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PROLOGUE(mpn_mod_1_2)
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2009-10-15 14:13:19 -04:00
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C // require rdx >=4
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2009-10-05 10:19:08 -04:00
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push %r12
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push %r13
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push %r14
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mov -8(%rsi,%rdx,8),%r14
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mov -16(%rsi,%rdx,8),%r13
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mov -32(%rsi,%rdx,8),%r11
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mov (%rcx),%r8
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mov 8(%rcx),%r9
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mov 16(%rcx),%r10
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mov %rdx,%rcx
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mov -24(%rsi,%rdx,8),%rax
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sub $6,%rcx
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jc skiplp
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ALIGN(16)
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lp:
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mul %r8
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mov $0,%r12
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add %rax,%r11
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adc %rdx,%r12
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mov %r9,%rax
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mul %r13
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add %rax,%r11
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adc %rdx,%r12
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mov %r11,%r13
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mov %r10,%rax
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mul %r14
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add %rax,%r13
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mov 0(%rsi,%rcx,8),%r11
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mov %r12,%r14
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adc %rdx,%r14
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mov 8(%rsi,%rcx,8),%rax
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sub $2,%rcx
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jnc lp
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skiplp:
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mul %r8
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mov $0,%r12
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add %rax,%r11
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adc %rdx,%r12
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mov %r9,%rax
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mul %r13
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add %rax,%r11
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adc %rdx,%r12
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mov %r11,%r13
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mov %r10,%rax
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mul %r14
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add %rax,%r13
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mov %r12,%r14
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adc %rdx,%r14
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cmp $-2,%rcx
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je case0
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case1:
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mov 8(%rsi,%rcx,8),%r11
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mov $0,%r12
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mov %r8,%rax
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mul %r13
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add %rax,%r11
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adc %rdx,%r12
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mov %r11,%r13
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mov %r9,%rax
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mul %r14
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add %rax,%r13
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mov %r12,%r14
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adc %rdx,%r14
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case0:
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mov %r8,%rax
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mul %r14
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add %rax,%r13
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adc $0,%rdx
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mov %r13,(%rdi)
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mov %rdx,8(%rdi)
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pop %r14
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pop %r13
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pop %r12
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ret
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EPILOGUE()
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