93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* ***** END GPL LICENSE BLOCK *****
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* */
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/** \file blender/blenlib/intern/math_bits_inline.c
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* \ingroup bli
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*/
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#ifndef __MATH_BITS_INLINE_C__
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#define __MATH_BITS_INLINE_C__
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#include "BLI_math_bits.h"
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MINLINE unsigned int highest_order_bit_i(unsigned int n)
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{
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n |= (n >> 1);
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n |= (n >> 2);
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n |= (n >> 4);
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n |= (n >> 8);
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n |= (n >> 16);
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return n - (n >> 1);
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}
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MINLINE unsigned short highest_order_bit_s(unsigned short n)
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{
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n |= (n >> 1);
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n |= (n >> 2);
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n |= (n >> 4);
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n |= (n >> 8);
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return (unsigned short)(n - (n >> 1));
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}
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#ifndef __GNUC__
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MINLINE int count_bits_i(unsigned int i)
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{
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/* variable-precision SWAR algorithm. */
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i = i - ((i >> 1) & 0x55555555);
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i = (i & 0x33333333) + ((i >> 2) & 0x33333333);
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return (((i + (i >> 4)) & 0x0F0F0F0F) * 0x01010101) >> 24;
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}
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#endif
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MINLINE int float_as_int(float f)
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{
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union { int i; float f; } u;
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u.f = f;
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return u.i;
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}
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MINLINE unsigned int float_as_uint(float f)
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{
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union { unsigned int i; float f; } u;
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u.f = f;
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return u.i;
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}
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MINLINE float int_as_float(int i)
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{
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union { int i; float f; } u;
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u.i = i;
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return u.f;
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}
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MINLINE float uint_as_float(unsigned int i)
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{
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union { unsigned int i; float f; } u;
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u.i = i;
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return u.f;
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}
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MINLINE float xor_fl(float x, int y)
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{
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return int_as_float(float_as_int(x) ^ y);
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}
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#endif /* __MATH_BITS_INLINE_C__ */
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