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dnl AMD64 mpn_bdiv_q_1, mpn_pi1_bdiv_q_1 -- schoolbook Hensel division by
dnl 1-limb divisor, returning quotient only.
dnl Copyright 2001, 2002, 2004, 2005, 2006, 2009, 2011 Free Software
dnl Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP 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 3 of the License, or (at
dnl your option) any later version.
dnl The GNU MP 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 GNU MP Library. If not, see http://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C AMD K8,K9 10
C AMD K10 10
C Intel P4 33
C Intel core2 13.25
C Intel corei 14
C Intel atom 42
C VIA nano ?
C INPUT PARAMETERS
C rp rdi
C up rsi
C n rdx
C d rcx
C di r8 just mpn_pi1_bdiv_q_1
C shift r9 just mpn_pi1_bdiv_q_1
ifdef(`HOST_DOS64',`
define(`IFDOS', `$1')
define(`IFELF', `')
',`
define(`IFDOS', `')
define(`IFELF', `$1')
')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(ELF64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_bdiv_q_1)
DOS64_ENTRY(4)
push %rbx
mov %rcx, %rax
xor R32(%rcx), R32(%rcx) C shift count
mov %rdx, %r10
bt $0, R32(%rax)
jnc L(evn) C skip bsfq unless divisor is even
L(odd): mov %rax, %rbx
shr R32(%rax)
and $127, R32(%rax) C d/2, 7 bits
ifdef(`PIC',`
mov binvert_limb_table@GOTPCREL(%rip), %rdx
',`
movabs $binvert_limb_table, %rdx
')
movzbl (%rdx,%rax), R32(%rax) C inv 8 bits
mov %rbx, %r11 C d without twos
lea (%rax,%rax), R32(%rdx) C 2*inv
imul R32(%rax), R32(%rax) C inv*inv
imul R32(%rbx), R32(%rax) C inv*inv*d
sub R32(%rax), R32(%rdx) C inv = 2*inv - inv*inv*d, 16 bits
lea (%rdx,%rdx), R32(%rax) C 2*inv
imul R32(%rdx), R32(%rdx) C inv*inv
imul R32(%rbx), R32(%rdx) C inv*inv*d
sub R32(%rdx), R32(%rax) C inv = 2*inv - inv*inv*d, 32 bits
lea (%rax,%rax), %r8 C 2*inv
imul %rax, %rax C inv*inv
imul %rbx, %rax C inv*inv*d
sub %rax, %r8 C inv = 2*inv - inv*inv*d, 64 bits
jmp L(com)
L(evn): bsf %rax, %rcx
shr R8(%rcx), %rax
jmp L(odd)
EPILOGUE()
PROLOGUE(mpn_pi1_bdiv_q_1)
DOS64_ENTRY(4)
IFDOS(` mov 56(%rsp), %r8 ')
IFDOS(` mov 64(%rsp), %r9 ')
push %rbx
mov %rcx, %r11 C d
mov %rdx, %r10 C n
mov %r9, %rcx C shift
L(com):
mov (%rsi), %rax C up[0]
dec %r10
jz L(one)
mov 8(%rsi), %rdx C up[1]
lea (%rsi,%r10,8), %rsi C up end
lea (%rdi,%r10,8), %rdi C rp end
neg %r10 C -n
shrd R8(%rcx), %rdx, %rax
xor R32(%rbx), R32(%rbx)
jmp L(ent)
ALIGN(8)
L(top):
C rax q
C rbx carry bit, 0 or 1
C rcx shift
C rdx
C rsi up end
C rdi rp end
C r10 counter, limbs, negative
mul %r11 C carry limb in rdx
mov (%rsi,%r10,8), %rax
mov 8(%rsi,%r10,8), %r9
shrd R8(%rcx), %r9, %rax
nop
sub %rbx, %rax C apply carry bit
setc R8(%rbx)
sub %rdx, %rax C apply carry limb
adc $0, %rbx
L(ent): imul %r8, %rax
mov %rax, (%rdi,%r10,8)
inc %r10
jnz L(top)
mul %r11 C carry limb in rdx
mov (%rsi), %rax C up high limb
shr R8(%rcx), %rax
sub %rbx, %rax C apply carry bit
sub %rdx, %rax C apply carry limb
imul %r8, %rax
mov %rax, (%rdi)
pop %rbx
DOS64_EXIT()
ret
L(one): shr R8(%rcx), %rax
imul %r8, %rax
mov %rax, (%rdi)
pop %rbx
DOS64_EXIT()
ret
EPILOGUE()
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