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74 lines
2.7 KiB
74 lines
2.7 KiB
/*
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* Copyright (c) 2015 Advanced Micro Devices, Inc.
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* Copyright (c) 2016 Aaron Watry
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <clc/clc.h>
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#include "../clcmacro.h"
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#include "math.h"
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_CLC_OVERLOAD _CLC_DEF int ilogb(float x) {
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uint ux = as_uint(x);
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uint ax = ux & EXSIGNBIT_SP32;
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int rs = -118 - (int) clz(ux & MANTBITS_SP32);
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int r = (int) (ax >> EXPSHIFTBITS_SP32) - EXPBIAS_SP32;
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r = ax < 0x00800000U ? rs : r;
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r = ax == 0 ? FP_ILOGB0 : r;
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// We could merge those 2 tests and have:
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//
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// r = ax >= EXPBITS_SP32 ? 0x7fffffff : r
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//
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// since FP_ILOGBNAN is set to INT_MAX, but it's clearer this way and
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// FP_ILOGBNAN can change without requiring changes to ilogb() code.
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r = ax > EXPBITS_SP32 ? FP_ILOGBNAN : r;
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r = ax == EXPBITS_SP32 ? 0x7fffffff : r;
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return r;
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}
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_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, int, ilogb, float);
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#ifdef cl_khr_fp64
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#pragma OPENCL EXTENSION cl_khr_fp64 : enable
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_CLC_OVERLOAD _CLC_DEF int ilogb(double x) {
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ulong ux = as_ulong(x);
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ulong ax = ux & ~SIGNBIT_DP64;
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int r = (int) (ax >> EXPSHIFTBITS_DP64) - EXPBIAS_DP64;
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int rs = -1011 - (int) clz(ax & MANTBITS_DP64);
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r = ax < 0x0010000000000000UL ? rs : r;
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r = ax == 0UL ? FP_ILOGB0 : r;
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// We could merge those 2 tests and have:
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//
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// r = ax >= 0x7ff0000000000000UL ? 0x7fffffff : r
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//
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// since FP_ILOGBNAN is set to INT_MAX, but it's clearer this way and
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// FP_ILOGBNAN can change without requiring changes to ilogb() code.
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r = ax > 0x7ff0000000000000UL ? FP_ILOGBNAN : r;
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r = ax == 0x7ff0000000000000UL ? 0x7fffffff : r;
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return r;
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}
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_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, int, ilogb, double);
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#endif // cl_khr_fp64
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