2009-02-19 18:22:30 -05:00
|
|
|
dnl AMD64 mpn_divexact_byff
|
|
|
|
|
|
|
|
|
|
dnl Copyright 2009 Jason Moxham
|
|
|
|
|
|
|
|
|
|
dnl This file is part of the MPIR Library.
|
|
|
|
|
|
|
|
|
|
dnl The MPIR Library is free software; you can redistribute it and/or modify
|
|
|
|
|
dnl it under the terms of the GNU Lesser General Public License as published
|
|
|
|
|
dnl by the Free Software Foundation; either version 2.1 of the License, or (at
|
|
|
|
|
dnl your option) any later version.
|
|
|
|
|
|
|
|
|
|
dnl The MPIR Library is distributed in the hope that it will be useful, but
|
|
|
|
|
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
|
|
|
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
|
|
|
dnl License for more details.
|
|
|
|
|
|
|
|
|
|
dnl You should have received a copy of the GNU Lesser General Public License
|
|
|
|
|
dnl along with the MPIR Library; see the file COPYING.LIB. If not, write
|
|
|
|
|
dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
|
|
|
dnl Boston, MA 02110-1301, USA.
|
|
|
|
|
|
|
|
|
|
include(`../config.m4')
|
|
|
|
|
|
|
|
|
|
C (rdi,rdx)=(rsi,rdx)/0xFFFFFFFFFFFFFFFF
|
|
|
|
|
C rax="remainder"
|
|
|
|
|
|
|
|
|
|
C where (rsi,rdx) = (rdi,rdx)*(B-1) -rax*B^rdx and 0 <= rax < B-1 B=0xFFFFFFFFFFFFFFFF
|
|
|
|
|
|
|
|
|
|
ASM_START()
|
|
|
|
|
PROLOGUE(mpn_divexact_byff)
|
2009-03-03 12:58:40 -05:00
|
|
|
C this is good but suffers from alignment slowdown
|
|
|
|
|
C we dont seem to have much freedom to re-arrange the instructions to avoid
|
|
|
|
|
C it , I suppose we could detect alignment at the start and have different
|
|
|
|
|
C routines for different alignments
|
2009-02-19 18:22:30 -05:00
|
|
|
xor %eax,%eax
|
|
|
|
|
mov %rdx,%rcx
|
|
|
|
|
and $3,%rcx
|
|
|
|
|
shr $2,%rdx
|
|
|
|
|
cmp $0,%rdx
|
2009-03-03 12:58:40 -05:00
|
|
|
C carry flag is clear here
|
2009-02-19 18:22:30 -05:00
|
|
|
jnz loop
|
|
|
|
|
sbb (%rsi),%rax
|
|
|
|
|
mov %rax,(%rdi)
|
|
|
|
|
dec %rcx
|
|
|
|
|
jz end1
|
|
|
|
|
sbb 8(%rsi),%rax
|
|
|
|
|
mov %rax,8(%rdi)
|
|
|
|
|
dec %rcx
|
|
|
|
|
jz end1
|
|
|
|
|
sbb 16(%rsi),%rax
|
|
|
|
|
mov %rax,16(%rdi)
|
|
|
|
|
dec %rcx
|
|
|
|
|
end1:
|
|
|
|
|
sbb $0,%rax
|
|
|
|
|
ret
|
|
|
|
|
ALIGN(16)
|
|
|
|
|
loop:
|
|
|
|
|
sbb (%rsi),%rax
|
|
|
|
|
mov %rax,(%rdi)
|
|
|
|
|
sbb 8(%rsi),%rax
|
|
|
|
|
mov %rax,8(%rdi)
|
|
|
|
|
sbb 16(%rsi),%rax
|
|
|
|
|
mov %rax,16(%rdi)
|
|
|
|
|
sbb 24(%rsi),%rax
|
|
|
|
|
mov %rax,24(%rdi)
|
|
|
|
|
lea 32(%rsi),%rsi
|
|
|
|
|
dec %rdx
|
|
|
|
|
lea 32(%rdi),%rdi
|
|
|
|
|
jnz loop
|
|
|
|
|
inc %rcx
|
|
|
|
|
dec %rcx
|
|
|
|
|
jz end
|
|
|
|
|
sbb (%rsi),%rax
|
|
|
|
|
mov %rax,(%rdi)
|
|
|
|
|
dec %rcx
|
|
|
|
|
jz end
|
|
|
|
|
sbb 8(%rsi),%rax
|
|
|
|
|
mov %rax,8(%rdi)
|
|
|
|
|
dec %rcx
|
|
|
|
|
jz end
|
|
|
|
|
sbb 16(%rsi),%rax
|
|
|
|
|
mov %rax,16(%rdi)
|
|
|
|
|
dec %rcx
|
|
|
|
|
end:
|
|
|
|
|
sbb $0,%rax
|
|
|
|
|
ret
|
|
|
|
|
EPILOGUE()
|
