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747 lines
23 KiB
747 lines
23 KiB
#ifndef _DEINT32_H
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#define _DEINT32_H
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/*-------------------------------------------------------------------------
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* drawElements Base Portability Library
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* -------------------------------------
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*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*//*!
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* \file
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* \brief 32-bit integer math.
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*//*--------------------------------------------------------------------*/
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#include "deDefs.h"
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#if (DE_COMPILER == DE_COMPILER_MSC)
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# include <intrin.h>
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#endif
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DE_BEGIN_EXTERN_C
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enum
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{
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DE_RCP_FRAC_BITS = 30 /*!< Number of fractional bits in deRcp32() result. */
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};
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void deRcp32 (deUint32 a, deUint32* rcp, int* exp);
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void deInt32_computeLUTs (void);
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void deInt32_selfTest (void);
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/*--------------------------------------------------------------------*//*!
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* \brief Compute the absolute of an int.
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* \param a Input value.
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* \return Absolute of the input value.
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*
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* \note The input 0x80000000u (for which the abs value cannot be
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* represented), is asserted and returns the value itself.
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*//*--------------------------------------------------------------------*/
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DE_INLINE int deAbs32 (int a)
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{
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DE_ASSERT((unsigned int) a != 0x80000000u);
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return (a < 0) ? -a : a;
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Compute the signed minimum of two values.
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* \param a First input value.
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* \param b Second input value.
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* \return The smallest of the two input values.
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*//*--------------------------------------------------------------------*/
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DE_INLINE int deMin32 (int a, int b)
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{
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return (a <= b) ? a : b;
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Compute the signed maximum of two values.
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* \param a First input value.
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* \param b Second input value.
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* \return The largest of the two input values.
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*//*--------------------------------------------------------------------*/
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DE_INLINE int deMax32 (int a, int b)
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{
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return (a >= b) ? a : b;
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Compute the unsigned minimum of two values.
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* \param a First input value.
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* \param b Second input value.
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* \return The smallest of the two input values.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deUint32 deMinu32 (deUint32 a, deUint32 b)
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{
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return (a <= b) ? a : b;
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Compute the unsigned minimum of two values.
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* \param a First input value.
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* \param b Second input value.
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* \return The smallest of the two input values.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deUint64 deMinu64 (deUint64 a, deUint64 b)
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{
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return (a <= b) ? a : b;
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Compute the unsigned maximum of two values.
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* \param a First input value.
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* \param b Second input value.
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* \return The largest of the two input values.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deUint32 deMaxu32 (deUint32 a, deUint32 b)
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{
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return (a >= b) ? a : b;
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Check if a value is in the <b>inclusive<b> range [mn, mx].
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* \param a Value to check for range.
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* \param mn Range minimum value.
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* \param mx Range maximum value.
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* \return True if (a >= mn) and (a <= mx), false otherwise.
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*
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* \see deInBounds32()
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*//*--------------------------------------------------------------------*/
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DE_INLINE deBool deInRange32 (int a, int mn, int mx)
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{
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return (a >= mn) && (a <= mx);
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Check if a value is in the half-inclusive bounds [mn, mx[.
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* \param a Value to check for range.
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* \param mn Range minimum value.
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* \param mx Range maximum value.
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* \return True if (a >= mn) and (a < mx), false otherwise.
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*
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* \see deInRange32()
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*//*--------------------------------------------------------------------*/
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DE_INLINE deBool deInBounds32 (int a, int mn, int mx)
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{
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return (a >= mn) && (a < mx);
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Clamp a value into the range [mn, mx].
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* \param a Value to clamp.
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* \param mn Minimum value.
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* \param mx Maximum value.
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* \return The clamped value in [mn, mx] range.
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*//*--------------------------------------------------------------------*/
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DE_INLINE int deClamp32 (int a, int mn, int mx)
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{
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DE_ASSERT(mn <= mx);
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if (a < mn) return mn;
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if (a > mx) return mx;
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return a;
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Get the sign of an integer.
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* \param a Input value.
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* \return +1 if a>0, 0 if a==0, -1 if a<0.
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*//*--------------------------------------------------------------------*/
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DE_INLINE int deSign32 (int a)
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{
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if (a > 0) return +1;
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if (a < 0) return -1;
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return 0;
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Extract the sign bit of a.
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* \param a Input value.
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* \return 0x80000000 if a<0, 0 otherwise.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deInt32 deSignBit32 (deInt32 a)
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{
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return (deInt32)((deUint32)a & 0x80000000u);
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Integer rotate right.
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* \param val Value to rotate.
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* \param r Number of bits to rotate (in range [0, 32]).
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* \return The rotated value.
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*//*--------------------------------------------------------------------*/
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DE_INLINE int deRor32 (int val, int r)
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{
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DE_ASSERT(r >= 0 && r <= 32);
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if (r == 0 || r == 32)
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return val;
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else
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return (int)(((deUint32)val >> r) | ((deUint32)val << (32-r)));
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Integer rotate left.
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* \param val Value to rotate.
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* \param r Number of bits to rotate (in range [0, 32]).
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* \return The rotated value.
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*//*--------------------------------------------------------------------*/
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DE_INLINE int deRol32 (int val, int r)
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{
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DE_ASSERT(r >= 0 && r <= 32);
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if (r == 0 || r == 32)
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return val;
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else
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return (int)(((deUint32)val << r) | ((deUint32)val >> (32-r)));
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Check if a value is a power-of-two.
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* \param a Input value.
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* \return True if input is a power-of-two value, false otherwise.
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*
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* \note Also returns true for zero.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deBool deIsPowerOfTwo32 (int a)
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{
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return ((a & (a - 1)) == 0);
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Check if a value is a power-of-two.
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* \param a Input value.
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* \return True if input is a power-of-two value, false otherwise.
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*
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* \note Also returns true for zero.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deBool deIsPowerOfTwo64 (deUint64 a)
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{
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return ((a & (a - 1ull)) == 0);
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Check if a value is a power-of-two.
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* \param a Input value.
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* \return True if input is a power-of-two value, false otherwise.
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*
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* \note Also returns true for zero.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deBool deIsPowerOfTwoSize (size_t a)
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{
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#if (DE_PTR_SIZE == 4)
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return deIsPowerOfTwo32(a);
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#elif (DE_PTR_SIZE == 8)
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return deIsPowerOfTwo64(a);
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#else
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# error "Invalid DE_PTR_SIZE"
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#endif
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Roud a value up to a power-of-two.
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* \param a Input value.
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* \return Smallest power-of-two value that is greater or equal to an input value.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deUint32 deSmallestGreaterOrEquallPowerOfTwoU32 (deUint32 a)
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{
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--a;
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a |= a >> 1u;
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a |= a >> 2u;
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a |= a >> 4u;
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a |= a >> 8u;
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a |= a >> 16u;
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return ++a;
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Roud a value up to a power-of-two.
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* \param a Input value.
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* \return Smallest power-of-two value that is greater or equal to an input value.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deUint64 deSmallestGreaterOrEquallPowerOfTwoU64 (deUint64 a)
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{
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--a;
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a |= a >> 1u;
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a |= a >> 2u;
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a |= a >> 4u;
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a |= a >> 8u;
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a |= a >> 16u;
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a |= a >> 32u;
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return ++a;
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Roud a value up to a power-of-two.
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* \param a Input value.
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* \return Smallest power-of-two value that is greater or equal to an input value.
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*//*--------------------------------------------------------------------*/
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DE_INLINE size_t deSmallestGreaterOrEquallPowerOfTwoSize (size_t a)
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{
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#if (DE_PTR_SIZE == 4)
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return deSmallestGreaterOrEquallPowerOfTwoU32(a);
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#elif (DE_PTR_SIZE == 8)
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return deSmallestGreaterOrEquallPowerOfTwoU64(a);
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#else
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# error "Invalid DE_PTR_SIZE"
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#endif
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Check if an integer is aligned to given power-of-two size.
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* \param a Input value.
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* \param align Alignment to check for.
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* \return True if input is aligned, false otherwise.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deBool deIsAligned32 (int a, int align)
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{
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DE_ASSERT(deIsPowerOfTwo32(align));
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return ((a & (align-1)) == 0);
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Check if an integer is aligned to given power-of-two size.
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* \param a Input value.
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* \param align Alignment to check for.
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* \return True if input is aligned, false otherwise.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deBool deIsAligned64 (deInt64 a, deInt64 align)
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{
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DE_ASSERT(deIsPowerOfTwo64(align));
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return ((a & (align-1)) == 0);
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Check if a pointer is aligned to given power-of-two size.
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* \param ptr Input pointer.
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* \param align Alignment to check for (power-of-two).
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* \return True if input is aligned, false otherwise.
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*//*--------------------------------------------------------------------*/
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DE_INLINE deBool deIsAlignedPtr (const void* ptr, deUintptr align)
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{
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DE_ASSERT((align & (align-1)) == 0); /* power of two */
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return (((deUintptr)ptr & (align-1)) == 0);
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Align an integer to given power-of-two size.
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* \param val Input to align.
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* \param align Alignment to check for (power-of-two).
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* \return The aligned value (larger or equal to input).
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*//*--------------------------------------------------------------------*/
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DE_INLINE deInt32 deAlign32 (deInt32 val, deInt32 align)
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{
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DE_ASSERT(deIsPowerOfTwo32(align));
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return (val + align - 1) & ~(align - 1);
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Align an integer to given power-of-two size.
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* \param val Input to align.
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* \param align Alignment to check for (power-of-two).
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* \return The aligned value (larger or equal to input).
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*//*--------------------------------------------------------------------*/
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DE_INLINE deInt64 deAlign64 (deInt64 val, deInt64 align)
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{
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DE_ASSERT(deIsPowerOfTwo64(align));
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return (val + align - 1) & ~(align - 1);
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Align a pointer to given power-of-two size.
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* \param ptr Input pointer to align.
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* \param align Alignment to check for (power-of-two).
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* \return The aligned pointer (larger or equal to input).
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*//*--------------------------------------------------------------------*/
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DE_INLINE void* deAlignPtr (void* ptr, deUintptr align)
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{
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deUintptr val = (deUintptr)ptr;
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DE_ASSERT((align & (align-1)) == 0); /* power of two */
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return (void*)((val + align - 1) & ~(align - 1));
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}
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/*--------------------------------------------------------------------*//*!
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* \brief Align a size_t value to given power-of-two size.
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* \param ptr Input value to align.
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* \param align Alignment to check for (power-of-two).
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* \return The aligned size (larger or equal to input).
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*//*--------------------------------------------------------------------*/
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DE_INLINE size_t deAlignSize (size_t val, size_t align)
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{
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DE_ASSERT(deIsPowerOfTwoSize(align));
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return (val + align - 1) & ~(align - 1);
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}
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extern const deInt8 g_clzLUT[256];
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/*--------------------------------------------------------------------*//*!
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* \brief Compute number of leading zeros in an integer.
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* \param a Input value.
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* \return The number of leading zero bits in the input.
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*//*--------------------------------------------------------------------*/
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DE_INLINE int deClz32 (deUint32 a)
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{
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#if (DE_COMPILER == DE_COMPILER_MSC)
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unsigned long i;
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if (_BitScanReverse(&i, (unsigned long)a) == 0)
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return 32;
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else
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return 31-i;
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#elif (DE_COMPILER == DE_COMPILER_GCC) || (DE_COMPILER == DE_COMPILER_CLANG)
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if (a == 0)
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return 32;
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else
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return __builtin_clz((unsigned int)a);
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#else
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if ((a & 0xFF000000u) != 0)
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return (int)g_clzLUT[a >> 24];
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if ((a & 0x00FF0000u) != 0)
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return 8 + (int)g_clzLUT[a >> 16];
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if ((a & 0x0000FF00u) != 0)
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return 16 + (int)g_clzLUT[a >> 8];
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return 24 + (int)g_clzLUT[a];
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#endif
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}
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extern const deInt8 g_ctzLUT[256];
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/*--------------------------------------------------------------------*//*!
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* \brief Compute number of trailing zeros in an integer.
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* \param a Input value.
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* \return The number of trailing zero bits in the input.
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*//*--------------------------------------------------------------------*/
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DE_INLINE int deCtz32 (deUint32 a)
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{
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#if (DE_COMPILER == DE_COMPILER_MSC)
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unsigned long i;
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if (_BitScanForward(&i, (unsigned long)a) == 0)
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return 32;
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else
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return i;
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#elif (DE_COMPILER == DE_COMPILER_GCC) || (DE_COMPILER == DE_COMPILER_CLANG)
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if (a == 0)
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return 32;
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else
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return __builtin_ctz((unsigned int)a);
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#else
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if ((a & 0x00FFFFFFu) == 0)
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return (int)g_ctzLUT[a >> 24] + 24;
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if ((a & 0x0000FFFFu) == 0)
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return (int)g_ctzLUT[(a >> 16) & 0xffu] + 16;
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if ((a & 0x000000FFu) == 0)
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return (int)g_ctzLUT[(a >> 8) & 0xffu] + 8;
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return (int)g_ctzLUT[a & 0xffu];
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#endif
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}
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|
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/*--------------------------------------------------------------------*//*!
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* \brief Compute integer 'floor' of 'log2' for a positive integer.
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* \param a Input value.
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* \return floor(log2(a)).
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*//*--------------------------------------------------------------------*/
|
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DE_INLINE int deLog2Floor32 (deInt32 a)
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{
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DE_ASSERT(a > 0);
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return 31 - deClz32((deUint32)a);
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}
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|
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/*--------------------------------------------------------------------*//*!
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|
* \brief Compute integer 'ceil' of 'log2' for a positive integer.
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|
* \param a Input value.
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* \return ceil(log2(a)).
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*//*--------------------------------------------------------------------*/
|
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DE_INLINE int deLog2Ceil32 (deInt32 a)
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{
|
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int log2floor = deLog2Floor32(a);
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if (deIsPowerOfTwo32(a))
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return log2floor;
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else
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return log2floor+1;
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}
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|
|
/*--------------------------------------------------------------------*//*!
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* \brief Compute the bit population count of an integer.
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* \param a Input value.
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* \return The number of one bits in the input.
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*//*--------------------------------------------------------------------*/
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DE_INLINE int dePop32 (deUint32 a)
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{
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deUint32 mask0 = 0x55555555; /* 1-bit values. */
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deUint32 mask1 = 0x33333333; /* 2-bit values. */
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deUint32 mask2 = 0x0f0f0f0f; /* 4-bit values. */
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deUint32 mask3 = 0x00ff00ff; /* 8-bit values. */
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deUint32 mask4 = 0x0000ffff; /* 16-bit values. */
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deUint32 t = (deUint32)a;
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t = (t & mask0) + ((t>>1) & mask0);
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t = (t & mask1) + ((t>>2) & mask1);
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t = (t & mask2) + ((t>>4) & mask2);
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t = (t & mask3) + ((t>>8) & mask3);
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t = (t & mask4) + (t>>16);
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return (int)t;
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}
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|
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DE_INLINE int dePop64 (deUint64 a)
|
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{
|
|
return dePop32((deUint32)(a & 0xffffffffull)) + dePop32((deUint32)(a >> 32));
|
|
}
|
|
|
|
/*--------------------------------------------------------------------*//*!
|
|
* \brief Reverse bytes in 32-bit integer (for example MSB -> LSB).
|
|
* \param a Input value.
|
|
* \return The input with bytes reversed
|
|
*//*--------------------------------------------------------------------*/
|
|
DE_INLINE deUint32 deReverseBytes32 (deUint32 v)
|
|
{
|
|
deUint32 b0 = v << 24;
|
|
deUint32 b1 = (v & 0x0000ff00) << 8;
|
|
deUint32 b2 = (v & 0x00ff0000) >> 8;
|
|
deUint32 b3 = v >> 24;
|
|
return b0|b1|b2|b3;
|
|
}
|
|
|
|
/*--------------------------------------------------------------------*//*!
|
|
* \brief Reverse bytes in 16-bit integer (for example MSB -> LSB).
|
|
* \param a Input value.
|
|
* \return The input with bytes reversed
|
|
*//*--------------------------------------------------------------------*/
|
|
DE_INLINE deUint16 deReverseBytes16 (deUint16 v)
|
|
{
|
|
return (deUint16)((v << 8) | (v >> 8));
|
|
}
|
|
|
|
DE_INLINE deInt32 deSafeMul32 (deInt32 a, deInt32 b)
|
|
{
|
|
deInt32 res = a * b;
|
|
DE_ASSERT((deInt64)res == ((deInt64)a * (deInt64)b));
|
|
return res;
|
|
}
|
|
|
|
DE_INLINE deInt32 deSafeAdd32 (deInt32 a, deInt32 b)
|
|
{
|
|
DE_ASSERT((deInt64)a + (deInt64)b == (deInt64)(a + b));
|
|
return (a + b);
|
|
}
|
|
|
|
DE_INLINE deInt32 deDivRoundUp32 (deInt32 a, deInt32 b)
|
|
{
|
|
return a/b + ((a%b) ? 1 : 0);
|
|
}
|
|
|
|
/*--------------------------------------------------------------------*//*!
|
|
* \brief Return value a rounded up to nearest multiple of b.
|
|
* \param a Input value.
|
|
* \param b Alignment to use.
|
|
* \return a if already aligned to b, otherwise next largest aligned value
|
|
*//*--------------------------------------------------------------------*/
|
|
DE_INLINE deInt32 deRoundUp32(deInt32 a, deInt32 b)
|
|
{
|
|
deInt32 d = a / b;
|
|
return d * b == a ? a : (d + 1) * b;
|
|
}
|
|
|
|
/* \todo [petri] Move to deInt64.h? */
|
|
|
|
DE_INLINE deInt32 deMulAsr32 (deInt32 a, deInt32 b, int shift)
|
|
{
|
|
return (deInt32)(((deInt64)a * (deInt64)b) >> shift);
|
|
}
|
|
|
|
DE_INLINE deInt32 deSafeMulAsr32 (deInt32 a, deInt32 b, int shift)
|
|
{
|
|
deInt64 res = ((deInt64)a * (deInt64)b) >> shift;
|
|
DE_ASSERT(res == (deInt64)(deInt32)res);
|
|
return (deInt32)res;
|
|
}
|
|
|
|
DE_INLINE deUint32 deSafeMuluAsr32 (deUint32 a, deUint32 b, int shift)
|
|
{
|
|
deUint64 res = ((deUint64)a * (deUint64)b) >> shift;
|
|
DE_ASSERT(res == (deUint64)(deUint32)res);
|
|
return (deUint32)res;
|
|
}
|
|
|
|
DE_INLINE deInt64 deMul32_32_64 (deInt32 a, deInt32 b)
|
|
{
|
|
return ((deInt64)a * (deInt64)b);
|
|
}
|
|
|
|
DE_INLINE deInt64 deAbs64 (deInt64 a)
|
|
{
|
|
DE_ASSERT((deUint64) a != 0x8000000000000000LL);
|
|
return (a >= 0) ? a : -a;
|
|
}
|
|
|
|
DE_INLINE int deClz64 (deUint64 a)
|
|
{
|
|
if ((a >> 32) != 0)
|
|
return deClz32((deUint32)(a >> 32));
|
|
return deClz32((deUint32)a) + 32;
|
|
}
|
|
|
|
/* Common hash & compare functions. */
|
|
|
|
DE_INLINE deUint32 deInt32Hash (deInt32 a)
|
|
{
|
|
/* From: http://www.concentric.net/~Ttwang/tech/inthash.htm */
|
|
deUint32 key = (deUint32)a;
|
|
key = (key ^ 61) ^ (key >> 16);
|
|
key = key + (key << 3);
|
|
key = key ^ (key >> 4);
|
|
key = key * 0x27d4eb2d; /* prime/odd constant */
|
|
key = key ^ (key >> 15);
|
|
return key;
|
|
}
|
|
|
|
DE_INLINE deUint32 deInt64Hash (deInt64 a)
|
|
{
|
|
/* From: http://www.concentric.net/~Ttwang/tech/inthash.htm */
|
|
deUint64 key = (deUint64)a;
|
|
key = (~key) + (key << 21); /* key = (key << 21) - key - 1; */
|
|
key = key ^ (key >> 24);
|
|
key = (key + (key << 3)) + (key << 8); /* key * 265 */
|
|
key = key ^ (key >> 14);
|
|
key = (key + (key << 2)) + (key << 4); /* key * 21 */
|
|
key = key ^ (key >> 28);
|
|
key = key + (key << 31);
|
|
return (deUint32)key;
|
|
}
|
|
|
|
DE_INLINE deUint32 deInt16Hash (deInt16 v) { return deInt32Hash(v); }
|
|
DE_INLINE deUint32 deUint16Hash (deUint16 v) { return deInt32Hash((deInt32)v); }
|
|
DE_INLINE deUint32 deUint32Hash (deUint32 v) { return deInt32Hash((deInt32)v); }
|
|
DE_INLINE deUint32 deUint64Hash (deUint64 v) { return deInt64Hash((deInt64)v); }
|
|
|
|
DE_INLINE deBool deInt16Equal (deInt16 a, deInt16 b) { return (a == b); }
|
|
DE_INLINE deBool deUint16Equal (deUint16 a, deUint16 b) { return (a == b); }
|
|
DE_INLINE deBool deInt32Equal (deInt32 a, deInt32 b) { return (a == b); }
|
|
DE_INLINE deBool deUint32Equal (deUint32 a, deUint32 b) { return (a == b); }
|
|
DE_INLINE deBool deInt64Equal (deInt64 a, deInt64 b) { return (a == b); }
|
|
DE_INLINE deBool deUint64Equal (deUint64 a, deUint64 b) { return (a == b); }
|
|
|
|
DE_INLINE deUint32 dePointerHash (const void* ptr)
|
|
{
|
|
deUintptr val = (deUintptr)ptr;
|
|
#if (DE_PTR_SIZE == 4)
|
|
return deInt32Hash((int)val);
|
|
#elif (DE_PTR_SIZE == 8)
|
|
return deInt64Hash((deInt64)val);
|
|
#else
|
|
# error Unsupported pointer size.
|
|
#endif
|
|
}
|
|
|
|
DE_INLINE deBool dePointerEqual (const void* a, const void* b)
|
|
{
|
|
return (a == b);
|
|
}
|
|
|
|
/**
|
|
* \brief Modulo that generates the same sign as divisor and rounds toward
|
|
* negative infinity -- assuming c99 %-operator.
|
|
*/
|
|
DE_INLINE deInt32 deInt32ModF (deInt32 n, deInt32 d)
|
|
{
|
|
deInt32 r = n%d;
|
|
if ((r > 0 && d < 0) || (r < 0 && d > 0)) r = r+d;
|
|
return r;
|
|
}
|
|
|
|
DE_INLINE deBool deInt64InInt32Range (deInt64 x)
|
|
{
|
|
return ((x >= (((deInt64)((deInt32)(-0x7FFFFFFF - 1))))) && (x <= ((1ll<<31)-1)));
|
|
}
|
|
|
|
|
|
DE_INLINE deUint32 deBitMask32 (int leastSignificantBitNdx, int numBits)
|
|
{
|
|
DE_ASSERT(deInRange32(leastSignificantBitNdx, 0, 32));
|
|
DE_ASSERT(deInRange32(numBits, 0, 32));
|
|
DE_ASSERT(deInRange32(leastSignificantBitNdx+numBits, 0, 32));
|
|
|
|
if (numBits < 32 && leastSignificantBitNdx < 32)
|
|
return ((1u<<numBits)-1u) << (deUint32)leastSignificantBitNdx;
|
|
else if (numBits == 0 && leastSignificantBitNdx == 32)
|
|
return 0u;
|
|
else
|
|
{
|
|
DE_ASSERT(numBits == 32 && leastSignificantBitNdx == 0);
|
|
return 0xFFFFFFFFu;
|
|
}
|
|
}
|
|
|
|
DE_INLINE deUint32 deUintMaxValue32 (int numBits)
|
|
{
|
|
DE_ASSERT(deInRange32(numBits, 1, 32));
|
|
if (numBits < 32)
|
|
return ((1u<<numBits)-1u);
|
|
else
|
|
return 0xFFFFFFFFu;
|
|
}
|
|
|
|
DE_INLINE deInt32 deIntMaxValue32 (int numBits)
|
|
{
|
|
DE_ASSERT(deInRange32(numBits, 1, 32));
|
|
if (numBits < 32)
|
|
return ((deInt32)1 << (numBits - 1)) - 1;
|
|
else
|
|
{
|
|
/* avoid undefined behavior of int overflow when shifting */
|
|
return 0x7FFFFFFF;
|
|
}
|
|
}
|
|
|
|
DE_INLINE deInt32 deIntMinValue32 (int numBits)
|
|
{
|
|
DE_ASSERT(deInRange32(numBits, 1, 32));
|
|
if (numBits < 32)
|
|
return -((deInt32)1 << (numBits - 1));
|
|
else
|
|
{
|
|
/* avoid undefined behavior of int overflow when shifting */
|
|
return (deInt32)(-0x7FFFFFFF - 1);
|
|
}
|
|
}
|
|
|
|
DE_INLINE deInt32 deSignExtendTo32 (deInt32 value, int numBits)
|
|
{
|
|
DE_ASSERT(deInRange32(numBits, 1, 32));
|
|
|
|
if (numBits < 32)
|
|
{
|
|
deBool signSet = ((deUint32)value & (1u<<(numBits-1))) != 0;
|
|
deUint32 signMask = deBitMask32(numBits, 32-numBits);
|
|
|
|
DE_ASSERT(((deUint32)value & signMask) == 0u);
|
|
|
|
return (deInt32)((deUint32)value | (signSet ? signMask : 0u));
|
|
}
|
|
else
|
|
return value;
|
|
}
|
|
|
|
DE_INLINE int deIntIsPow2(int powerOf2)
|
|
{
|
|
if (powerOf2 <= 0)
|
|
return 0;
|
|
return (powerOf2 & (powerOf2 - (int)1)) == (int)0;
|
|
}
|
|
|
|
DE_INLINE int deIntRoundToPow2(int number, int powerOf2)
|
|
{
|
|
DE_ASSERT(deIntIsPow2(powerOf2));
|
|
return (number + (int)powerOf2 - (int)1) & (int)(~(powerOf2 - 1));
|
|
}
|
|
|
|
|
|
DE_END_EXTERN_C
|
|
|
|
#endif /* _DEINT32_H */
|