1995-02-18 09:27:10 +08:00
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/* ffs -- find first set bit in a word, counted from least significant end.
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For mc68020, mc68030, mc68040.
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Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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Contributed by Torbjorn Granlund (tege@sics.se).
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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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <string.h>
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#undef ffs
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#if defined (__GNUC__) && defined (__mc68020__)
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int
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DEFUN(ffs, (x), int x)
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{
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int cnt;
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* misc/efgcvt_r.c (ecvt_r): Handle negative values.
* stdlib/stdlib.h: Replace __CONSTVALUE by attribute.
* stdlib/abs.c, stdlib/div.c, stdlib/labs.c, stdlib/ldiv.c,
sysdeps/generic/hypot.c: Remove obsolete __CONSTVALUE.
* stdio-common/printf_fp.c (__printf_fp): Fix parameter
declaration.
* sysdeps/generic/putenv.c (putenv): Fix second argument of
setenv.
* sysdeps/ieee754/hypot.c: New file, extracted out of cabs.c.
* sysdeps/ieee754/cabs.c: Don't define hypot here.
* sysdeps/ieee754/ieee754.h (union ieee854_long_double): Fix
definition of ieee_nan alternative.
* sysdeps/m68k/__longjmp.c, sysdeps/m68k/setjmp.c: Add register
prefix spec.
* sysdeps/m68k/ffs.c (ffs): Fix register constraint.
* sysdeps/m68k/fpu/__math.h: Include <errno.h>. Replace obsolete
__CONSTVALUE by attribute.
(floor): Round to negative infinity.
(rint, expm1) [__NO_MATH_INLINES]: Don't define, to avoid type
clash when compiling source.
(pow): Handle x == 0 and x < 0.
(ceil, __isinf, __isnan): Fix register constraints.
(__isinfl, __isnanl): Added.
* sysdeps/m68k/fpu/acos.c, sysdeps/m68k/fpu/atan2.c,
sysdeps/m68k/fpu/fmod.c, sysdeps/m68k/fpu/ldexp.c,
sysdeps/m68k/fpu/pow.c: Remove obsolete __CONSTVALUE.
* sysdeps/m68k/bsd-_setjmp.S, sysdeps/m68k/bsd-setjmp.S: Fix
assembler syntax.
* sysdeps/unix/bsd/bsd4.4/fchdir.S (fchdir): Take only one
argument.
* sysdeps/unix/bsd/clock.c (timeval_to_clock_t): Fix timeval to
clock_t conversion.
(clock): Don't multiply by CLOCKS_PER_SEC.
* sysdeps/unix/bsd/poll.c (poll): Fix msec to timeval conversion.
* sysdeps/unix/bsd/sun/m68k/brk.S (brk): Compare with address of
__end.
* sysdeps/unix/bsd/sun/m68k/vfork.S: Fix assembler syntax.
* sysdeps/unix/bsd/ualarm.c (ualarm): Fix timeval calculation.
* sysdeps/unix/bsd/vax/vfork.S: Remove duplicate label.
1996-01-17 10:03:00 +08:00
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asm("bfffo %1{#0:#0},%0" : "=d" (cnt) : "dm" (x & -x));
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1995-02-18 09:27:10 +08:00
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return 32 - cnt;
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}
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#else
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#include <sysdeps/generic/ffs.c>
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#endif
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