dnl x86-64 mpn_divrem_1 -- mpn by limb division.
dnl Copyright 2004, 2005, 2007-2012, 2014 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
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 General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C norm unorm frac
C AMD K8,K9 13 13 12
C AMD K10 13 13 12
C Intel P4 43 44 43
C Intel core2 24.5 24.5 19.5
C Intel corei 20.5 19.5 18
C Intel atom 43 46 36
C VIA nano 25.5 25.5 24
C mp_limb_t
C mpn_divrem_1 (mp_ptr qp, mp_size_t fn,
C mp_srcptr np, mp_size_t nn, mp_limb_t d)
C mp_limb_t
C mpn_preinv_divrem_1 (mp_ptr qp, mp_size_t fn,
C mp_srcptr np, mp_size_t nn, mp_limb_t d,
C mp_limb_t dinv, int cnt)
C INPUT PARAMETERS
define(`qp', `%rdi')
define(`fn_param', `%rsi')
define(`up_param', `%rdx')
define(`un_param', `%rcx')
define(`d', `%r8')
define(`dinv', `%r9') C only for mpn_preinv_divrem_1
C shift passed on stack C only for mpn_preinv_divrem_1
define(`cnt', `%rcx')
define(`up', `%rsi')
define(`fn', `%r12')
define(`un', `%rbx')
C rax rbx rcx rdx rsi rdi rbp r8 r9 r10 r11 r12 r13 r14 r15
C cnt qp d dinv
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
IFSTD(`define(`CNTOFF', `40($1)')')
IFDOS(`define(`CNTOFF', `104($1)')')
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_preinv_divrem_1)
FUNC_ENTRY(4)
IFDOS(` mov 56(%rsp), %r8 ')
IFDOS(` mov 64(%rsp), %r9 ')
xor R32(%rax), R32(%rax)
push %r13
push %r12
push %rbp
push %rbx
mov fn_param, fn
mov un_param, un
add fn_param, un_param
mov up_param, up
lea -8(qp,un_param,8), qp
test d, d
js L(nent)
mov CNTOFF(%rsp), R8(cnt)
shl R8(cnt), d
jmp L(uent)
EPILOGUE()
ALIGN(16)
PROLOGUE(mpn_divrem_1)
FUNC_ENTRY(4)
IFDOS(` mov 56(%rsp), %r8 ')
xor R32(%rax), R32(%rax)
push %r13
push %r12
push %rbp
push %rbx
mov fn_param, fn
mov un_param, un
add fn_param, un_param
mov up_param, up
je L(ret)
lea -8(qp,un_param,8), qp
xor R32(%rbp), R32(%rbp)
test d, d
jns L(unnormalized)
L(normalized):
test un, un
je L(8) C un == 0
mov -8(up,un,8), %rbp
dec un
mov %rbp, %rax
sub d, %rbp
cmovc %rax, %rbp
sbb R32(%rax), R32(%rax)
inc R32(%rax)
mov %rax, (qp)
lea -8(qp), qp
L(8):
IFSTD(` push %rdi ')
IFSTD(` push %rsi ')
push %r8
IFSTD(` mov d, %rdi ')
IFDOS(` sub $32, %rsp ')
IFDOS(` mov d, %rcx ')
ASSERT(nz, `test $15, %rsp')
CALL( mpn_invert_limb)
IFDOS(` add $32, %rsp ')
pop %r8
IFSTD(` pop %rsi ')
IFSTD(` pop %rdi ')
mov %rax, dinv
mov %rbp, %rax
jmp L(nent)
ALIGN(16)
L(ntop):mov (up,un,8), %r10 C K8-K10 P6-CNR P6-NHM P4
mul dinv C 0,13 0,20 0,18 0,45
add %r10, %rax C 4 8 3 12
adc %rbp, %rdx C 5 9 10 13
mov %rax, %rbp C 5 9 4 13
mov %rdx, %r13 C 6 11 12 23
imul d, %rdx C 6 11 11 23
sub %rdx, %r10 C 10 16 14 33
mov d, %rax C
add %r10, %rax C 11 17 15 34
cmp %rbp, %r10 C 11 17 15 34
cmovc %r10, %rax C 12 18 16 35
adc $-1, %r13 C
cmp d, %rax C
jae L(nfx) C
L(nok): mov %r13, (qp) C
sub $8, qp C
L(nent):lea 1(%rax), %rbp C
dec un C
jns L(ntop) C
xor R32(%rcx), R32(%rcx)
jmp L(frac)
L(nfx): sub d, %rax
inc %r13
jmp L(nok)
L(unnormalized):
test un, un
je L(44)
mov -8(up,un,8), %rax
cmp d, %rax
jae L(44)
mov %rbp, (qp)
mov %rax, %rbp
lea -8(qp), qp
je L(ret)
dec un
L(44):
bsr d, %rcx
not R32(%rcx)
shl R8(%rcx), d
shl R8(%rcx), %rbp
push %rcx
IFSTD(` push %rdi ')
IFSTD(` push %rsi ')
push %r8
IFSTD(` sub $8, %rsp ')
IFSTD(` mov d, %rdi ')
IFDOS(` sub $40, %rsp ')
IFDOS(` mov d, %rcx ')
ASSERT(nz, `test $15, %rsp')
CALL( mpn_invert_limb)
IFSTD(` add $8, %rsp ')
IFDOS(` add $40, %rsp ')
pop %r8
IFSTD(` pop %rsi ')
IFSTD(` pop %rdi ')
pop %rcx
mov %rax, dinv
mov %rbp, %rax
test un, un
je L(frac)
L(uent):dec un
mov (up,un,8), %rbp
neg R32(%rcx)
shr R8(%rcx), %rbp
neg R32(%rcx)
or %rbp, %rax
jmp L(ent)
ALIGN(16)
L(utop):mov (up,un,8), %r10
shl R8(%rcx), %rbp
neg R32(%rcx)
shr R8(%rcx), %r10
neg R32(%rcx)
or %r10, %rbp
mul dinv
add %rbp, %rax
adc %r11, %rdx
mov %rax, %r11
mov %rdx, %r13
imul d, %rdx
sub %rdx, %rbp
mov d, %rax
add %rbp, %rax
cmp %r11, %rbp
cmovc %rbp, %rax
adc $-1, %r13
cmp d, %rax
jae L(ufx)
L(uok): mov %r13, (qp)
sub $8, qp
L(ent): mov (up,un,8), %rbp
dec un
lea 1(%rax), %r11
jns L(utop)
L(uend):shl R8(%rcx), %rbp
mul dinv
add %rbp, %rax
adc %r11, %rdx
mov %rax, %r11
mov %rdx, %r13
imul d, %rdx
sub %rdx, %rbp
mov d, %rax
add %rbp, %rax
cmp %r11, %rbp
cmovc %rbp, %rax
adc $-1, %r13
cmp d, %rax
jae L(efx)
L(eok): mov %r13, (qp)
sub $8, qp
jmp L(frac)
L(ufx): sub d, %rax
inc %r13
jmp L(uok)
L(efx): sub d, %rax
inc %r13
jmp L(eok)
L(frac):mov d, %rbp
neg %rbp
jmp L(fent)
ALIGN(16) C K8-K10 P6-CNR P6-NHM P4
L(ftop):mul dinv C 0,12 0,17 0,17
add %r11, %rdx C 5 8 10
mov %rax, %r11 C 4 8 3
mov %rdx, %r13 C 6 9 11
imul %rbp, %rdx C 6 9 11
mov d, %rax C
add %rdx, %rax C 10 14 14
cmp %r11, %rdx C 10 14 14
cmovc %rdx, %rax C 11 15 15
adc $-1, %r13 C
mov %r13, (qp) C
sub $8, qp C
L(fent):lea 1(%rax), %r11 C
dec fn C
jns L(ftop) C
shr R8(%rcx), %rax
L(ret): pop %rbx
pop %rbp
pop %r12
pop %r13
FUNC_EXIT()
ret
EPILOGUE()