| /* |
| * 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. |
| */ |
| |
| #include "math64.h" |
| |
| __attribute__((overloadable, always_inline, weak)) double |
| frexp(double x, int *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); |
| } |
| |
| #if __OPENCL_C_VERSION__ < 200 |
| __attribute__((overloadable, always_inline, weak)) double |
| frexp(double x, __local int *ep) |
| { |
| int e; |
| double f = frexp(x, &e); |
| *ep = e; |
| return f; |
| } |
| |
| __attribute__((overloadable, always_inline, weak)) double |
| frexp(double x, __global int *ep) |
| { |
| int e; |
| double f = frexp(x, &e); |
| *ep = e; |
| return f; |
| } |
| #endif |