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dnl x86 mpn_sec_tabselect.
dnl Copyright 2011, 2021 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 cycles/limb
C P5 ?
C P6 model 0-8,10-12 ?
C P6 model 9 (Banias) ?
C P6 model 13 (Dothan) ?
C P4 model 0 (Willamette) ?
C P4 model 1 (?) ?
C P4 model 2 (Northwood) 4.5
C P4 model 3 (Prescott) ?
C P4 model 4 (Nocona) ?
C Intel Atom ?
C AMD K6 ?
C AMD K7 3.4
C AMD K8 ?
C AMD K10 ?
C NOTES
C * This has not been tuned for any specific processor. Its speed should not
C be too bad, though.
C * Using SSE2 could result in many-fold speedup.
C mpn_sec_tabselect (mp_limb_t *rp, mp_limb_t *tp, mp_size_t n, mp_size_t nents, mp_size_t which)
define(`rp', `%edi')
define(`tp', `%esi')
define(`n', `%ebx')
define(`nents', `32(%esp)')
define(`which', `36(%esp)')
define(`i', `%ebp')
define(`mask', `%ecx')
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_sec_tabselect)
push %edi
push %esi
push %ebx
push %ebp
mov 20(%esp), rp
mov 24(%esp), tp
mov 28(%esp), n
lea (rp,n,4), rp
lea (tp,n,4), tp
L(outer):
subl $1, which
sbb mask, mask
mov n, i
neg i
ALIGN(16)
L(top): mov (tp,i,4), %eax
mov (rp,i,4), %edx
xor %edx, %eax
and mask, %eax
xor %edx, %eax
mov %eax, (rp,i,4)
inc i
js L(top)
L(end): lea (tp,n,4), tp
decl nents
jne L(outer)
L(outer_end):
pop %ebp
pop %ebx
pop %esi
pop %edi
ret
EPILOGUE()
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