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/* OpenCL built-in library: nan()
Copyright (c) 2011 Erik Schnetter <eschnetter@perimeterinstitute.ca>
Perimeter Institute for Theoretical Physics
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 "templates.h"
/* Fall-back implementation which ignores the nancode */
// DEFINE_EXPR_V_U(nan, (vtype)NAN)
DEFINE_EXPR_V_U(nan,
({
utype nancode = a;
// number of bits in the mantissa
sutype mant_dig =
TYPED_CONST(sutype,
HALF_MANT_DIG, FLT_MANT_DIG, DBL_MANT_DIG) - 1;
// mask for the mantissa
sutype nan_mant_mask = (1 << mant_dig) - 1;
// mask out bits that can't be stored in the mantissa
// this also ensures the sign bit is zero,
// i.e. that the nan is quiet
nancode &= nan_mant_mask;
// ensure the nancode is not zero
nancode = nancode ? nancode : (sutype)1;
// create the exponent
sutype nan_exp =
TYPED_CONST(sutype,
HALF_MAX_EXP - HALF_MIN_EXP,
FLT_MAX_EXP - FLT_MIN_EXP,
DBL_MAX_EXP - DBL_MIN_EXP) + 2;
nan_exp <<= mant_dig;
// combine exponent and nancode
utype val = nan_exp | nancode;
*(vtype*)&val;
}))
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