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71 lines
2.3 KiB
C
71 lines
2.3 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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float modff(float x, float *iptr)
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{
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/* modff splits the argument x into integer and fraction parts,
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each with the same sign as x. */
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unsigned int ux, mask;
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int xexp;
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GET_BITS_SP32(x, ux);
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xexp = ((ux & (~SIGNBIT_SP32)) >> EXPSHIFTBITS_SP32) - EXPBIAS_SP32;
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if (xexp < 0)
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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_SP32(ux & SIGNBIT_SP32, *iptr);
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return x;
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}
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else if (xexp < EXPSHIFTBITS_SP32)
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{
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/* x lies between 1.0 and 2**(24) */
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/* Mask out the bits of x that we don't want */
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mask = (1 << (EXPSHIFTBITS_SP32 - xexp)) - 1;
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PUT_BITS_SP32(ux & ~mask, *iptr);
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return x - *iptr;
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}
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else if ((ux & (~SIGNBIT_SP32)) > 0x7f800000)
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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. Set iptr to x and return zero
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with the sign of x. */
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*iptr = x;
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PUT_BITS_SP32(ux & SIGNBIT_SP32, x);
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return x;
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}
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}
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