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* hwint.c: New. Extracted from toplev.c. * hwint.h (clz_hwi, ctz_hwi, ffs_hwi, exact_log2, floor_log2): Move from toplev.h. * toplev.c (clz_hwi, ctz_hwi, ffs_hwi, exact_log2, floor_log2): Move to hwint.c. * toplev.h (clz_hwi, ctz_hwi, ffs_hwi, exact_log2, floor_log2): Move to hwint.h. * builtins.c, combine.c, config/i386/winnt.c, double-int.c, explow.c, expmed.c, fold-const.c, ggc-page.c, ggc-zone.c, ifcvt.c, ipa-struct-reorg.c, ira-color.c, matrix-reorg.c, omp-low.c, real.c, recog.c, reload.c, rtlanal.c, simplify-rtx.c, stor-layout.c, tree-dfa.c, tree-ssa-alias.c, tree-ssa-loop-niter.c, tree-vect-data-refs.c, tree-vect-loop-manip.c, tree-vect-loop.c, tree-vect-stmts.c, tree-vrp.c: Don't include toplev.h. * genattrtab.c, genconditions.c, genemit.c, genextract.c, genoutput.c, genpeep.c, genpreds.c, genrecog.c: Don't include toplev.h in generated output. * Makefile.in (OBJS-common): Add hwint.o. Dependencies for above files changed to remove toplev.h. (hwint.o): New. (insn-attrtab.o, insn-emit.o, insn-extract.o, insn-output.o, insn-peep.o, insn-preds.o, insn-recog.o): Don't depend on toplev.h. * config/i386/t-cygming (winnt.o): Don't depend on toplev.h. * config/i386/t-interix (winnt.o): Don't depend on toplev.h. fortran: * trans-common.c: Don't include toplev.h. java: * boehm.c: Don't include toplev.h. * Make-lang.in (java/boehm.o): Don't depend on toplev.h. lto: * lto-object.c: Don't include toplev.h. * Make-lang.in (lto/lto-object.o): Don't depend on toplev.h. From-SVN: r167301
101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/* Operations on HOST_WIDE_INT.
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Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#if GCC_VERSION < 3004
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/* The functions clz_hwi, ctz_hwi, ffs_hwi, floor_log2 and exact_log2
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are defined as inline functions in hwint.h if GCC_VERSION >= 3004.
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The definitions here are used for older versions of GCC and non-GCC
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bootstrap compilers. */
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/* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
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If X is 0, return -1. */
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int
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floor_log2 (unsigned HOST_WIDE_INT x)
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{
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int t = 0;
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if (x == 0)
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return -1;
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if (HOST_BITS_PER_WIDE_INT > 64)
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if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
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t += 64;
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if (HOST_BITS_PER_WIDE_INT > 32)
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if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
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t += 32;
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if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
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t += 16;
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if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
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t += 8;
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if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
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t += 4;
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if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
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t += 2;
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if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
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t += 1;
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return t;
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}
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/* Return the logarithm of X, base 2, considering X unsigned,
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if X is a power of 2. Otherwise, returns -1. */
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int
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exact_log2 (unsigned HOST_WIDE_INT x)
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{
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if (x != (x & -x))
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return -1;
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return floor_log2 (x);
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}
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/* Given X, an unsigned number, return the number of least significant bits
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that are zero. When X == 0, the result is the word size. */
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int
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ctz_hwi (unsigned HOST_WIDE_INT x)
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{
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return x ? floor_log2 (x & -x) : HOST_BITS_PER_WIDE_INT;
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}
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/* Similarly for most significant bits. */
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int
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clz_hwi (unsigned HOST_WIDE_INT x)
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{
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return HOST_BITS_PER_WIDE_INT - 1 - floor_log2(x);
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}
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/* Similar to ctz_hwi, except that the least significant bit is numbered
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starting from 1, and X == 0 yields 0. */
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int
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ffs_hwi (unsigned HOST_WIDE_INT x)
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{
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return 1 + floor_log2 (x & -x);
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}
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#endif /* GCC_VERSION < 3004 */
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