268 lines
5.1 KiB
NASM
268 lines
5.1 KiB
NASM
dnl mpn_karasub
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dnl Copyright 2011 The Code Cavern
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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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ASM_START()
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PROLOGUE(mpn_karasub)
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push %rbx
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push %rbp
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push %r12
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push %r13
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push %r14
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push %r15
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#rp is rdi
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#tp is rsi
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#n is rdx and put it on the stack
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push %rdx
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shr $1,%rdx
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#n2 is rdx
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lea (%rdx,%rdx,1),%rcx
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# 2*n2 is rcx
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# L is rdi
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# H is rbp
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# tp is rsi
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lea (%rdi,%rcx,8),%rbp
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xor %rax,%rax
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xor %rbx,%rbx
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# rax rbx are the carrys
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lea -24(%rdi,%rdx,8),%rdi
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lea -24(%rsi,%rdx,8),%rsi
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lea -24(%rbp,%rdx,8),%rbp
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mov $3,%rcx
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neg %rdx
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add $3,%rdx
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# assume n>8 or some such
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.align 16
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lp: bt $2,%rbx
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mov (%rdi,%rcx,8),%r8
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adc (%rbp,%rdx,8),%r8
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mov %r8,%r12
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mov 8(%rdi,%rcx,8),%r9
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adc 8(%rbp,%rdx,8),%r9
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mov 16(%rdi,%rcx,8),%r10
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adc 16(%rbp,%rdx,8),%r10
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mov 24(%rdi,%rcx,8),%r11
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adc 24(%rbp,%rdx,8),%r11
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rcl $1,%rbx
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bt $1,%rax
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mov %r11,%r15
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adc (%rdi,%rdx,8),%r8
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mov %r9,%r13
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adc 8(%rdi,%rdx,8),%r9
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mov %r10,%r14
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adc 16(%rdi,%rdx,8),%r10
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adc 24(%rdi,%rdx,8),%r11
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rcl $1,%rax
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bt $2,%rbx
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adc (%rbp,%rcx,8),%r12
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adc 8(%rbp,%rcx,8),%r13
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adc 16(%rbp,%rcx,8),%r14
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adc 24(%rbp,%rcx,8),%r15
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rcl $1,%rbx
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bt $1,%rax
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sbb (%rsi,%rdx,8),%r8
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sbb 8(%rsi,%rdx,8),%r9
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sbb 16(%rsi,%rdx,8),%r10
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sbb 24(%rsi,%rdx,8),%r11
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mov %r10,16(%rdi,%rcx,8)
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mov %r11,24(%rdi,%rcx,8)
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rcl $1,%rax
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bt $2,%rbx
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mov %r8,(%rdi,%rcx,8)
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mov %r9,8(%rdi,%rcx,8)
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sbb (%rsi,%rcx,8),%r12
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sbb 8(%rsi,%rcx,8),%r13
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sbb 16(%rsi,%rcx,8),%r14
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sbb 24(%rsi,%rcx,8),%r15
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rcl $1,%rbx
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add $4,%rcx
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mov %r12,(%rbp,%rdx,8)
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mov %r13,8(%rbp,%rdx,8)
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mov %r14,16(%rbp,%rdx,8)
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mov %r15,24(%rbp,%rdx,8)
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add $4,%rdx
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jnc lp
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cmp $2,%rdx
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jg case0
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jz case1
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jp case2
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case3: #rdx=0
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bt $2,%rbx
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mov (%rdi,%rcx,8),%r8
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adc (%rbp,%rdx,8),%r8
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mov %r8,%r12
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mov 8(%rdi,%rcx,8),%r9
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adc 8(%rbp,%rdx,8),%r9
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mov 16(%rdi,%rcx,8),%r10
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adc 16(%rbp,%rdx,8),%r10
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rcl $1,%rbx
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bt $1,%rax
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adc (%rdi,%rdx,8),%r8
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mov %r9,%r13
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adc 8(%rdi,%rdx,8),%r9
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mov %r10,%r14
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adc 16(%rdi,%rdx,8),%r10
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rcl $1,%rax
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bt $2,%rbx
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adc (%rbp,%rcx,8),%r12
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adc 8(%rbp,%rcx,8),%r13
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adc 16(%rbp,%rcx,8),%r14
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rcl $1,%rbx
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bt $1,%rax
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sbb (%rsi,%rdx,8),%r8
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sbb 8(%rsi,%rdx,8),%r9
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sbb 16(%rsi,%rdx,8),%r10
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mov %r10,16(%rdi,%rcx,8)
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rcl $1,%rax
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bt $2,%rbx
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mov %r8,(%rdi,%rcx,8)
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mov %r9,8(%rdi,%rcx,8)
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sbb (%rsi,%rcx,8),%r12
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sbb 8(%rsi,%rcx,8),%r13
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sbb 16(%rsi,%rcx,8),%r14
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rcl $1,%rbx
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add $3,%rcx
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mov %r12,(%rbp,%rdx,8)
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mov %r13,8(%rbp,%rdx,8)
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mov %r14,16(%rbp,%rdx,8)
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add $3,%rdx
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jmp fin
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case2: #rdx=1
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bt $2,%rbx
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mov (%rdi,%rcx,8),%r8
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adc (%rbp,%rdx,8),%r8
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mov %r8,%r12
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mov 8(%rdi,%rcx,8),%r9
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adc 8(%rbp,%rdx,8),%r9
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rcl $1,%rbx
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bt $1,%rax
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adc (%rdi,%rdx,8),%r8
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mov %r9,%r13
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adc 8(%rdi,%rdx,8),%r9
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rcl $1,%rax
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bt $2,%rbx
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adc (%rbp,%rcx,8),%r12
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adc 8(%rbp,%rcx,8),%r13
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rcl $1,%rbx
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bt $1,%rax
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sbb (%rsi,%rdx,8),%r8
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sbb 8(%rsi,%rdx,8),%r9
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rcl $1,%rax
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bt $2,%rbx
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mov %r8,(%rdi,%rcx,8)
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mov %r9,8(%rdi,%rcx,8)
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sbb (%rsi,%rcx,8),%r12
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sbb 8(%rsi,%rcx,8),%r13
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rcl $1,%rbx
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add $2,%rcx
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mov %r12,(%rbp,%rdx,8)
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mov %r13,8(%rbp,%rdx,8)
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add $2,%rdx
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jmp fin
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case1: #rdx=2
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bt $2,%rbx
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mov (%rdi,%rcx,8),%r8
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adc (%rbp,%rdx,8),%r8
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mov %r8,%r12
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rcl $1,%rbx
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bt $1,%rax
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adc (%rdi,%rdx,8),%r8
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rcl $1,%rax
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bt $2,%rbx
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adc (%rbp,%rcx,8),%r12
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rcl $1,%rbx
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bt $1,%rax
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sbb (%rsi,%rdx,8),%r8
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rcl $1,%rax
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bt $2,%rbx
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mov %r8,(%rdi,%rcx,8)
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sbb (%rsi,%rcx,8),%r12
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rcl $1,%rbx
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inc %rcx
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mov %r12,(%rbp,%rdx,8)
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inc %rdx
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case0: #rdx=3
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fin: # if odd the do next two
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pop %r8
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bt $0,%r8
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jnc notodd
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xor %r10,%r10
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mov (%rbp,%rcx,8),%r8
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mov 8(%rbp,%rcx,8),%r9
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sub (%rsi,%rcx,8),%r8
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sbb 8(%rsi,%rcx,8),%r9
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rcl $1,%r10
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add %r8,(%rbp,%rdx,8)
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adc %r9,8(%rbp,%rdx,8)
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mov %rdx,%rsi
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l7: adcq $0,16(%rbp,%rdx,8)
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inc %rdx
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jc l7
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mov %rsi,%rdx
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bt $0,%r10
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l8: sbbq $0,16(%rbp,%rdx,8)
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inc %rdx
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jc l8
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mov %rsi,%rdx
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# add in all carrys
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# should we do the borrows last as it may be possible to underflow
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# could use popcount
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notodd: mov %rcx,%rsi
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bt $0,%rax
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l1: sbbq $0,(%rdi,%rcx,8)
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inc %rcx
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jc l1
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mov %rsi,%rcx
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bt $1,%rax
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l2: adcq $0,(%rdi,%rcx,8)
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inc %rcx
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jc l2
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mov %rsi,%rcx
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bt $2,%rbx
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l3: adcq $0,(%rdi,%rcx,8)
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inc %rcx
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jc l3
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mov %rdx,%rsi
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bt $0,%rbx
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l4: sbbq $0,(%rbp,%rdx,8)
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inc %rdx
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jc l4
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mov %rsi,%rdx
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bt $1,%rbx
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l5: adcq $0,(%rbp,%rdx,8)
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inc %rdx
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jc l5
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mov %rsi,%rdx
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bt $2,%rbx
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l6: adcq $0,(%rbp,%rdx,8)
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inc %rdx
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jc l6
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pop %r15
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pop %r14
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pop %r13
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pop %r12
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pop %rbp
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pop %rbx
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ret
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EPILOGUE()
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