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dnl AMD64 mpn_gcd_11 -- 1 x 1 gcd.
dnl Based on the K7 gcd_1.asm, by Kevin Ryde. Rehacked for AMD64 by Torbjorn
dnl Granlund.
dnl Copyright 2000-2002, 2005, 2009, 2011, 2012, 2017 Free Software
dnl 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/bit
C AMD K8,K9 ?
C AMD K10 ?
C AMD bd1 ?
C AMD bd2 ?
C AMD bd3 ?
C AMD bd4 ?
C AMD bt1 5.4
C AMD bt2 ?
C AMD zn1 ?
C AMD zn2 ?
C Intel P4 ?
C Intel CNR ?
C Intel PNR ?
C Intel NHM ?
C Intel WSM ?
C Intel SBR ?
C Intel IBR ?
C Intel HWL ?
C Intel BWL ?
C Intel SKL ?
C Intel atom ?
C Intel SLM ?
C Intel GLM ?
C Intel GLM+ ?
C VIA nano ?
C ctz_table[n] is the number of trailing zeros on n, or MAXSHIFT if n==0.
deflit(MAXSHIFT, 8)
deflit(MASK, eval((m4_lshift(1,MAXSHIFT))-1))
DEF_OBJECT(ctz_table,64)
.byte MAXSHIFT
forloop(i,1,MASK,
` .byte m4_count_trailing_zeros(i)
')
END_OBJECT(ctz_table)
define(`u0', `%rdi')
define(`v0', `%rsi')
define(`cnt', `%rcx')
define(`s0', `%rax')
define(`t0', `%rdx')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
ASM_START()
TEXT
ALIGN(64)
PROLOGUE(mpn_gcd_11)
FUNC_ENTRY(2)
LEA( ctz_table, %r10)
mov v0, t0
sub u0, t0
jz L(end)
ALIGN(16)
L(top): mov u0, s0
sub v0, u0
cmovc t0, u0 C u = |u - v|
cmovc s0, v0 C v = min(u,v)
and $MASK, R32(t0)
movzbl (%r10,t0), R32(cnt)
jz L(count_better)
L(shr): shr R8(cnt), u0
mov v0, t0
sub u0, t0
jnz L(top)
L(end): mov v0, %rax
C rdx = 0 for the benefit of internal gcd_22 call
FUNC_EXIT()
ret
L(count_better):
bsf u0, cnt
jmp L(shr)
EPILOGUE()
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