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84 lines
2.6 KiB
C
84 lines
2.6 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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#include "libm_errno.h"
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#define USE_HANDLE_ERRORF
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#include "libm_inlines.h"
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#undef USE_HANDLE_ERRORF
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// Disable "C4163: not available as intrinsic function" warning that older
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// compilers may issue here.
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#pragma warning(disable:4163)
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#pragma function(floorf)
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float FN_PROTOTYPE(floorf)(float x)
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{
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float r;
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int rexp, xneg;
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unsigned int ux, ax, ur, mask;
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GET_BITS_SP32(x, ux);
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ax = ux & (~SIGNBIT_SP32);
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xneg = (ux != ax);
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if (ax >= 0x4b800000)
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{
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/* abs(x) is either NaN, infinity, or >= 2^24 */
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if (ax > 0x7f800000)
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/* x is NaN */
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return _handle_errorf("floorf", OP_FLOOR, ux|0x00400000, _DOMAIN,
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0, EDOM, x, 0.0F, 1);
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else
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return x;
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}
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else if (ax < 0x3f800000) /* abs(x) < 1.0 */
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{
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if (ax == 0x00000000)
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/* x is +zero or -zero; return the same zero */
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return x;
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else if (xneg) /* x < 0.0 */
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return -1.0F;
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else
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return 0.0F;
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}
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else
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{
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rexp = ((ux & EXPBITS_SP32) >> EXPSHIFTBITS_SP32) - EXPBIAS_SP32;
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/* Mask out the bits of r that we don't want */
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mask = (1 << (EXPSHIFTBITS_SP32 - rexp)) - 1;
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ur = (ux & ~mask);
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PUT_BITS_SP32(ur, r);
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if (xneg && (ux != ur))
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/* We threw some bits away and x was negative */
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return r - 1.0F;
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else
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return r;
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}
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}
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