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/*
* Copyright (c) 2014 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.
*/
#if __CLC_FPSIZE == 32
#ifdef __CLC_SCALAR
_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE frexp(float x, private int *ep) {
int i = as_int(x);
int ai = i & 0x7fffffff;
int d = ai > 0 & ai < 0x00800000;
// scale subnormal by 2^26 without multiplying
float s = as_float(ai | 0x0d800000) - 0x1.0p-100F;
ai = d ? as_int(s) : ai;
int e = (ai >> 23) - 126 - (d ? 26 : 0);
int t = ai == 0 | e == 129;
i = (i & 0x80000000) | 0x3f000000 | (ai & 0x007fffff);
*ep = t ? 0 : e;
return t ? x : as_float(i);
}
#define __CLC_FREXP_VEC(width) \
_CLC_OVERLOAD _CLC_DEF float##width frexp(float##width x, private int##width *ep) { \
int##width i = as_int##width(x); \
int##width ai = i & 0x7fffffff; \
int##width d = ai > 0 & ai < 0x00800000; \
/* scale subnormal by 2^26 without multiplying */ \
float##width s = as_float##width(ai | 0x0d800000) - 0x1.0p-100F; \
ai = bitselect(ai, as_int##width(s), d); \
int##width e = (ai >> 23) - 126 - bitselect((int##width)0, (int##width)26, d); \
int##width t = ai == (int##width)0 | e == (int##width)129; \
i = (i & (int##width)0x80000000) | (int##width)0x3f000000 | (ai & 0x007fffff); \
*ep = bitselect(e, (int##width)0, t); \
return bitselect(as_float##width(i), x, as_float##width(t)); \
}
__CLC_FREXP_VEC(2)
__CLC_FREXP_VEC(3)
__CLC_FREXP_VEC(4)
__CLC_FREXP_VEC(8)
__CLC_FREXP_VEC(16)
#undef __CLC_FREXP_VEC
#endif
#endif
#if __CLC_FPSIZE == 64
#ifdef __CLC_SCALAR
_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE frexp(__CLC_GENTYPE x, private __CLC_INTN *ep) {
long i = as_long(x);
long ai = i & 0x7fffffffffffffffL;
int d = ai > 0 & ai < 0x0010000000000000L;
// scale subnormal by 2^54 without multiplying
double s = as_double(ai | 0x0370000000000000L) - 0x1.0p-968;
ai = d ? as_long(s) : ai;
int e = (int)(ai >> 52) - 1022 - (d ? 54 : 0);
int t = ai == 0 | e == 1025;
i = (i & 0x8000000000000000L) | 0x3fe0000000000000L | (ai & 0x000fffffffffffffL);
*ep = t ? 0 : e;
return t ? x : as_double(i);
}
#define __CLC_FREXP_VEC(width) \
_CLC_OVERLOAD _CLC_DEF double##width frexp(double##width x, private int##width *ep) { \
long##width i = as_long##width(x); \
long##width ai = i & 0x7fffffffffffffffL; \
long##width d = ai > 0 & ai < 0x0010000000000000L; \
/* scale subnormal by 2^54 without multiplying */ \
double##width s = as_double##width(ai | 0x0370000000000000L) - 0x1.0p-968; \
ai = bitselect(ai, as_long##width(s), d); \
int##width e = convert_int##width(ai >> 52) - 1022 - bitselect((int##width)0, (int##width)54, convert_int##width(d)); \
int##width t = convert_int##width(ai == (long##width)0) | (e == (int##width)129); \
i = (i & (long##width)0x8000000000000000L) | (long##width)0x3fe0000000000000L | (ai & 0x000fffffffffffffL); \
*ep = bitselect(e, (int##width)0, t); \
return bitselect(as_double##width(i), x, as_double##width(convert_long##width(t))); \
}
__CLC_FREXP_VEC(2)
__CLC_FREXP_VEC(3)
__CLC_FREXP_VEC(4)
__CLC_FREXP_VEC(8)
__CLC_FREXP_VEC(16)
#undef __CLC_FREXP_VEC
#endif
#endif
#define __CLC_FREXP_DEF(addrspace) \
_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE frexp(__CLC_GENTYPE x, addrspace __CLC_INTN *iptr) { \
__CLC_INTN private_iptr; \
__CLC_GENTYPE ret = frexp(x, &private_iptr); \
*iptr = private_iptr; \
return ret; \
}
__CLC_FREXP_DEF(local);
__CLC_FREXP_DEF(global);
#undef __CLC_FREXP_DEF
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