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4c74403188
Change-Id: Iae65e95cfa0d92091b8b0a424ae36d88efa76aa9 Reviewed-on: https://review.haiku-os.org/c/buildtools/+/3020 Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/* mpf_cmp_si -- Compare a float with a signed integer.
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Copyright 1993-1995, 1999-2002, 2004, 2012, 2015 Free Software
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Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or 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 copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include "gmp-impl.h"
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int
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mpf_cmp_si (mpf_srcptr u, long int vval) __GMP_NOTHROW
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{
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mp_srcptr up;
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mp_size_t usize;
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mp_exp_t uexp;
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mp_limb_t ulimb;
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int usign;
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unsigned long abs_vval;
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usize = SIZ (u);
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/* 1. Are the signs different? */
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if ((usize < 0) == (vval < 0)) /* don't use xor, type size may differ */
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{
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/* U and V are both non-negative or both negative. */
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if (usize == 0)
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/* vval >= 0 */
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return -(vval != 0);
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if (vval == 0)
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/* usize >= 0 */
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return usize != 0;
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/* Fall out. */
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}
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else
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{
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/* Either U or V is negative, but not both. */
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return usize >= 0 ? 1 : -1;
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}
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/* U and V have the same sign and are both non-zero. */
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/* 2. Are the exponents different (V's exponent == 1)? */
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uexp = EXP (u);
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usign = usize >= 0 ? 1 : -1;
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usize = ABS (usize);
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abs_vval = ABS_CAST (unsigned long, vval);
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#if GMP_NAIL_BITS != 0
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if (uexp != 1 + (abs_vval > GMP_NUMB_MAX))
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return (uexp < 1 + (abs_vval > GMP_NUMB_MAX)) ? -usign : usign;
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#else
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if (uexp != 1)
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return (uexp < 1) ? -usign : usign;
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#endif
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up = PTR (u);
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ASSERT (usize > 0);
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ulimb = up[--usize];
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#if GMP_NAIL_BITS != 0
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if (uexp == 2)
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{
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if ((ulimb >> GMP_NAIL_BITS) != 0)
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return usign;
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ulimb = (ulimb << GMP_NUMB_BITS);
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if (usize != 0) ulimb |= up[--usize];
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}
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#endif
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/* 3. Compare the most significant mantissa limb with V. */
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if (ulimb != abs_vval)
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return (ulimb < abs_vval) ? -usign : usign;
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/* Ignore zeroes at the low end of U. */
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for (; *up == 0; ++up)
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--usize;
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/* 4. Now, if the number of limbs are different, we have a difference
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since we have made sure the trailing limbs are not zero. */
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if (usize > 0)
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return usign;
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/* Wow, we got zero even if we tried hard to avoid it. */
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return 0;
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}
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