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77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
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/*******************************************************************************
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MIT License
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-----------
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Copyright (c) 2002-2019 Advanced Micro Devices, Inc.
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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 documentaon 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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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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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 "libm.h"
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#include "libm_util.h"
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double modf(double x, double *iptr)
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{
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/* modf splits the argument x into integer and fraction parts,
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each with the same sign as x. */
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long long xexp;
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unsigned long long ux, ax, mask;
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GET_BITS_DP64(x, ux);
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ax = ux & (~SIGNBIT_DP64);
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if (ax >= 0x4340000000000000)
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{
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/* abs(x) is either NaN, infinity, or >= 2^53 */
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if (ax > 0x7ff0000000000000)
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{
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/* x is NaN */
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*iptr = x;
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return x + x; /* Raise invalid if it is a signalling NaN */
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}
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else
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{
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/* x is infinity or large. Return zero with the sign of x */
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*iptr = x;
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PUT_BITS_DP64(ux & SIGNBIT_DP64, x);
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return x;
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}
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}
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else if (ax < 0x3ff0000000000000)
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{
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/* abs(x) < 1.0. Set iptr to zero with the sign of x
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and return x. */
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PUT_BITS_DP64(ux & SIGNBIT_DP64, *iptr);
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return x;
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}
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else
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{
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xexp = ((ux & EXPBITS_DP64) >> EXPSHIFTBITS_DP64) - EXPBIAS_DP64;
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/* Mask out the bits of x that we don't want */
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mask = 1;
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mask = (mask << (EXPSHIFTBITS_DP64 - xexp)) - 1;
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PUT_BITS_DP64(ux & ~mask, *iptr);
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return x - *iptr;
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}
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}
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