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dnl AMD64 mpn_tabselect.
dnl Copyright 2011 Free Software 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 2.5
C AMD K10 2.5
C AMD bobcat 3.5
C Intel P4 4
C Intel core2 2.33
C Intel NHM 2.5
C Intel SBR 2.2
C Intel atom 5
C VIA nano 3.5
C NOTES
C * This has not been tuned for any specific processor. Its speed should not
C be too bad, though.
C * Using SSE2/AVX2 could result in many-fold speedup.
C mpn_tabselect (mp_limb_t *rp, mp_limb_t *tp, mp_size_t n, mp_size_t nents, mp_size_t which)
define(`rp', `%rdi')
define(`tp', `%rsi')
define(`n', `%rdx')
define(`nents', `%rcx')
define(`which', `%r8')
define(`i', `%rbp')
define(`maskp', `%r11')
define(`maskn', `%r12')
C rax rbx rcx rdx rdi rsi rbp (rsp) r8 r9 r10 r11 r12 r13 r14 r15
C nents n rp tab which
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_tabselect)
DOS64_ENTRY(4)
IFDOS(` mov 56(%rsp), %r8d ')
push %rbx
push %rbp
push %r12
lea (rp,n,8), rp
lea (tp,n,8), tp
sub nents, which
L(outer):
lea (which,nents), %rax
neg %rax C set CF iff 'which' != k
sbb maskn, maskn
mov maskn, maskp
not maskp
mov n, i
neg i
test $1, R32(n)
je L(top)
mov (tp,i,8), %rax
and maskp, %rax
mov (rp,i,8), %r9
and maskn, %r9
or %r9, %rax
mov %rax, (rp,i,8)
add $1, i
jns L(end)
ALIGN(16)
L(top): mov (tp,i,8), %rax
mov 8(tp,i,8), %rbx
and maskp, %rax
and maskp, %rbx
mov (rp,i,8), %r9
mov 8(rp,i,8), %r10
and maskn, %r9
and maskn, %r10
or %r9, %rax
or %r10, %rbx
mov %rax, (rp,i,8)
mov %rbx, 8(rp,i,8)
add $2, i
js L(top)
L(end): lea (tp,n,8), tp
dec nents
jne L(outer)
L(outer_end):
pop %r12
pop %rbp
pop %rbx
DOS64_EXIT()
ret
EPILOGUE()
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