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dnl Intel P5 mpn_popcount -- mpn bit population count.
dnl Copyright 2001, 2002, 2014, 2015 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 P5: 8.0 cycles/limb
C unsigned long mpn_popcount (mp_srcptr src, mp_size_t size);
C
C An arithmetic approach has been found to be slower than the table lookup,
C due to needing too many instructions.
C The slightly strange quoting here helps the renaming done by tune/many.pl.
deflit(TABLE_NAME,
m4_assert_defined(`GSYM_PREFIX')
GSYM_PREFIX`'mpn_popcount``'_table')
C FIXME: exporting the table to hamdist is incorrect as it hurt incremental
C linking.
RODATA
ALIGN(8)
GLOBL TABLE_NAME
TABLE_NAME:
forloop(i,0,255,
` .byte m4_popcount(i)
')
defframe(PARAM_SIZE,8)
defframe(PARAM_SRC, 4)
TEXT
ALIGN(8)
PROLOGUE(mpn_popcount)
deflit(`FRAME',0)
movl PARAM_SIZE, %ecx
pushl %esi FRAME_pushl()
ifdef(`PIC',`
pushl %ebx FRAME_pushl()
pushl %ebp FRAME_pushl()
ifdef(`DARWIN',`
shll %ecx C size in byte pairs
LEA( TABLE_NAME, %ebp)
movl PARAM_SRC, %esi
xorl %eax, %eax C total
xorl %ebx, %ebx C byte
xorl %edx, %edx C byte
',`
call L(here)
L(here):
popl %ebp
shll %ecx C size in byte pairs
addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ebp
movl PARAM_SRC, %esi
xorl %eax, %eax C total
xorl %ebx, %ebx C byte
movl TABLE_NAME@GOT(%ebp), %ebp
xorl %edx, %edx C byte
')
define(TABLE,`(%ebp,$1)')
',`
dnl non-PIC
shll %ecx C size in byte pairs
movl PARAM_SRC, %esi
pushl %ebx FRAME_pushl()
xorl %eax, %eax C total
xorl %ebx, %ebx C byte
xorl %edx, %edx C byte
define(TABLE,`TABLE_NAME`'($1)')
')
ALIGN(8) C necessary on P55 for claimed speed
L(top):
C eax total
C ebx byte
C ecx counter, 2*size to 2
C edx byte
C esi src
C edi
C ebp [PIC] table
addl %ebx, %eax
movb -1(%esi,%ecx,2), %bl
addl %edx, %eax
movb -2(%esi,%ecx,2), %dl
movb TABLE(%ebx), %bl
decl %ecx
movb TABLE(%edx), %dl
jnz L(top)
ifdef(`PIC',`
popl %ebp
')
addl %ebx, %eax
popl %ebx
addl %edx, %eax
popl %esi
ret
EPILOGUE()
ASM_END()
|
