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dnl AMD64 mpn_sec_tabselect.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 2011-2013 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 good for cpu
C AMD K8,K9 1.5 Y
C AMD K10 1.4
C AMD bd1 2.64
C AMD bobcat 2.15 Y
C Intel P4 4
C Intel core2 1.38
C Intel NHM 1.75
C Intel SBR 1.25
C Intel atom 2.5 Y
C VIA nano 1.75 Y
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 * WORKS FOR n mod 4 = 0 ONLY!
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', `%rdi')
define(`tp', `%rsi')
define(`n', `%rdx')
define(`nents', `%rcx')
define(`which', `%r8')
define(`i', `%rbp')
define(`j', `%r9')
C rax rbx rcx rdx rdi rsi rbp r8 r9 r10 r11 r12 r13 r14 r15
C nents n rp tab i which j * * * * * *
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_sec_tabselect)
FUNC_ENTRY(4)
IFDOS(` mov 56(%rsp), %r8d ')
push %rbx
push %rbp
push %r12
push %r13
push %r14
push %r15
mov n, j
add $-4, j
js L(outer_end)
L(outer_top):
mov nents, i
push tp
xor R32(%r12), R32(%r12)
xor R32(%r13), R32(%r13)
xor R32(%r14), R32(%r14)
xor R32(%r15), R32(%r15)
mov which, %rbx
ALIGN(16)
L(top): sub $1, %rbx
sbb %rax, %rax
mov 0(tp), %r10
mov 8(tp), %r11
and %rax, %r10
and %rax, %r11
or %r10, %r12
or %r11, %r13
mov 16(tp), %r10
mov 24(tp), %r11
and %rax, %r10
and %rax, %r11
or %r10, %r14
or %r11, %r15
lea (tp,n,8), tp
add $-1, i
jne L(top)
mov %r12, 0(rp)
mov %r13, 8(rp)
mov %r14, 16(rp)
mov %r15, 24(rp)
pop tp
lea 32(tp), tp
lea 32(rp), rp
add $-4, j
jns L(outer_top)
L(outer_end):
test $2, R8(n)
jz L(b0x)
L(b1x): mov nents, i
push tp
xor R32(%r12), R32(%r12)
xor R32(%r13), R32(%r13)
mov which, %rbx
ALIGN(16)
L(tp2): sub $1, %rbx
sbb %rax, %rax
mov 0(tp), %r10
mov 8(tp), %r11
and %rax, %r10
and %rax, %r11
or %r10, %r12
or %r11, %r13
lea (tp,n,8), tp
add $-1, i
jne L(tp2)
mov %r12, 0(rp)
mov %r13, 8(rp)
pop tp
lea 16(tp), tp
lea 16(rp), rp
L(b0x): test $1, R8(n)
jz L(b00)
L(b01): mov nents, i
xor R32(%r12), R32(%r12)
mov which, %rbx
ALIGN(16)
L(tp1): sub $1, %rbx
sbb %rax, %rax
mov 0(tp), %r10
and %rax, %r10
or %r10, %r12
lea (tp,n,8), tp
add $-1, i
jne L(tp1)
mov %r12, 0(rp)
L(b00): pop %r15
pop %r14
pop %r13
pop %r12
pop %rbp
pop %rbx
FUNC_EXIT()
ret
EPILOGUE()
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