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/*
* Copyright (c) 2014 Advanced Micro Devices, Inc.
*
* 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.
*/
_CL_OVERLOADABLE vtype ldexp(vtype x, itype n) {
itype l = as_itype(x);
itype e = (l >> 52) & (itype)0x7ff;
itype s = l & (itype)0x8000000000000000;
utype ux = as_utype(x * (vtype)0x1.0p+53);
itype de = (as_itype(ux >> 52) & (itype)0x7ff) - (itype)53;
itype c = (e == (itype)0);
e = c ? de: e;
ux = c ? ux : l;
itype v = e + n;
v = clamp(v, (itype)-0x7ff, (itype)0x7ff);
ux &= (utype)(~EXPBITS_DP64);
vtype mr = as_vtype(ux | ((utype)(v+(itype)53) << 52));
mr = mr * (vtype)0x1.0p-53;
mr = (v > (itype)0) ? as_vtype(ux | ((utype)v << 52)) : mr;
mr = (v == (itype)0x7ff) ? as_vtype(s | (itype)PINFBITPATT_DP64) : mr;
mr = (v < (itype)-53) ? as_vtype(s) : mr;
mr = ((n == (itype)0) | isinf(x) | (x == (vtype)0) ) ? x : mr;
return mr;
}
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