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1998-07-30 12:38 Ulrich Drepper <drepper@cygnus.com> * sysdeps/i386/ffs.c: Add ffsl entry point. * sysdeps/i386/i686/ffs.c: Likewise. * sysdeps/m68k/ffs.c: Likewise. * sysdeps/powerpc/ffs.c: Likewise. * sysdeps/i386/i486/bits/string.h: Add optimizations for ffs/ffsl on i686. 1998-07-30 Richard Henderson <rth@cygnus.com> * elf/Makefile (ld-map): Move initialization below Makeconfig include. * sysdeps/libm-ieee754/k_standard.c (zero): Make non-const to work around gcc bug. * string/string.h (ffsl, ffsll): Prototype. * string/Version (GLIBC_2.1): Add them. * sysdeps/alpha/ffs.S: Schedule for EV5. Add ffsl and ffsll entry points. * sysdeps/alpha/ffsll.S: New file. Empty. * sysdeps/generic/ffs.c: Add ffsl and ffsll entry points. * sysdeps/generic/ffsll.c: New file. * string/Makefile (routines): Add ffsll. 1998-07-30 10:03 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/alpha/bits/time.h: Don't define CLK_TCK for strictly ISO C compliant programs. * sysdeps/unix/sysv/linux/mips/bits/time.h: Likewise. 1998-07-22 Andreas Jaeger <aj@arthur.rhein-neckar.de> * inet/protocols/rwhod.h: Correct typo in comment. * configure.in: Use better regex for gettext.
91 lines
2.4 KiB
ArmAsm
91 lines
2.4 KiB
ArmAsm
/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
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Contributed by David Mosberger (davidm@cs.arizona.edu).
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Finds the first bit set in an integer. Optimized for the Alpha
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architecture. */
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#include <sysdep.h>
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.set noreorder
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.set noat
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ENTRY(__ffs)
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#ifdef PROF
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ldgp gp, 0(pv)
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lda AT, _mcount
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jsr AT, (AT), _mcount
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.prologue 1
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zap $16, 0xF0, $16
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br $ffsl..ng
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#else
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.prologue 0
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zap $16, 0xF0, $16
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# FALLTHRU
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#endif
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END(__ffs)
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.align 4
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ENTRY(ffsl)
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#ifdef PROF
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ldgp gp, 0(pv)
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lda AT, _mcount
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jsr AT, (AT), _mcount
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.prologue 1
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$ffsl..ng:
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#else
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.prologue 0
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#endif
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not $16, $1 # e0 :
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ldi $2, -1 # .. e1 :
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cmpbge $1, $2, $3 # e0 : bit N == 1 for byte N == 0
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clr $0 # .. e1 :
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addq $3, 1, $4 # e0 :
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bic $4, $3, $3 # e1 : bit N == 1 for first byte N != 0
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and $3, 0xF0, $4 # e0 :
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and $3, 0xCC, $5 # .. e1 :
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and $3, 0xAA, $6 # e0 :
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cmovne $4, 4, $0 # .. e1 :
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cmovne $5, 2, $5 # e0 :
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cmovne $6, 1, $6 # .. e1 :
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addl $0, $5, $0 # e0 :
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addl $0, $6, $0 # e1 : $0 == N
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extbl $16, $0, $1 # e0 : $1 == byte N
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ldi $2, 1 # .. e1 :
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negq $1, $3 # e0 :
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and $3, $1, $3 # e1 : bit N == least bit set of byte N
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and $3, 0xF0, $4 # e0 :
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and $3, 0xCC, $5 # .. e1 :
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and $3, 0xAA, $6 # e0 :
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cmovne $4, 5, $2 # .. e1 :
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cmovne $5, 2, $5 # e0 :
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cmovne $6, 1, $6 # .. e1 :
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s8addl $0, $2, $0 # e0 : mult byte ofs by 8 and sum
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addl $5, $6, $5 # .. e1 :
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addl $0, $5, $0 # e0 :
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nop # .. e1 :
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cmoveq $16, 0, $0 # e0 : trap input == 0 case.
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ret # .. e1 : 18
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END(ffsl)
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weak_alias (__ffs, ffs)
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weak_extern (ffsl)
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weak_alias (ffsl, ffsll)
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