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/*
* Copyright (c) 2015 Advanced Micro Devices, Inc.
* Copyright (c) 2016 Aaron Watry
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <clc/clc.h>
#include "../clcmacro.h"
#include "math.h"
_CLC_OVERLOAD _CLC_DEF int ilogb(float x) {
uint ux = as_uint(x);
uint ax = ux & EXSIGNBIT_SP32;
int rs = -118 - (int) clz(ux & MANTBITS_SP32);
int r = (int) (ax >> EXPSHIFTBITS_SP32) - EXPBIAS_SP32;
r = ax < 0x00800000U ? rs : r;
r = ax > EXPBITS_SP32 | ax == 0 ? 0x80000000 : r;
r = ax == EXPBITS_SP32 ? 0x7fffffff : r;
return r;
}
_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, int, ilogb, float);
#ifdef cl_khr_fp64
#pragma OPENCL EXTENSION cl_khr_fp64 : enable
_CLC_OVERLOAD _CLC_DEF ilogb(double x) {
ulong ux = as_ulong(x);
ulong ax = ux & ~SIGNBIT_DP64;
int r = (int) (ax >> EXPSHIFTBITS_DP64) - EXPBIAS_DP64;
int rs = -1011 - (int) clz(ax & MANTBITS_DP64);
r = ax < 0x0010000000000000UL ? rs : r;
r = ax > 0x7ff0000000000000UL | ax == 0UL ? 0x80000000 : r;
r = ax == 0x7ff0000000000000UL ? 0x7fffffff : r;
return r;
}
_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, int, ilogb, double);
#endif // cl_khr_fp64
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