93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
#include <stdint.h>
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#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
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/*
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musl as a whole is licensed under the following standard MIT license:
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----------------------------------------------------------------------
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Copyright © 2005-2020 Rich Felker, et al.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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----------------------------------------------------------------------
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*/
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static inline void fp_force_evalf(float x)
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{
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volatile float y;
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y = x;
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}
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#define FORCE_EVAL(x) do { \
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fp_force_evalf(x); \
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} while(0)
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float floorf(float x)
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{
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union {float f; uint32_t i;} u = {x};
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int e = (int)(u.i >> 23 & 0xff) - 0x7f;
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uint32_t m;
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if (e >= 23)
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return x;
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if (e >= 0) {
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m = 0x007fffff >> e;
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if ((u.i & m) == 0)
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return x;
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FORCE_EVAL(x + 0x1p120f);
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if (u.i >> 31)
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u.i += m;
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u.i &= ~m;
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} else {
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FORCE_EVAL(x + 0x1p120f);
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if (u.i >> 31 == 0)
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u.i = 0;
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else if (u.i << 1)
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u.f = -1.0;
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}
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return u.f;
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}
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float ceilf(float x)
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{
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union {float f; uint32_t i;} u = {x};
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int e = (int)(u.i >> 23 & 0xff) - 0x7f;
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uint32_t m;
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if (e >= 23)
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return x;
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if (e >= 0) {
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m = 0x007fffff >> e;
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if ((u.i & m) == 0)
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return x;
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FORCE_EVAL(x + 0x1p120f);
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if (u.i >> 31 == 0)
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u.i += m;
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u.i &= ~m;
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} else {
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FORCE_EVAL(x + 0x1p120f);
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if (u.i >> 31)
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u.f = -0.0;
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else if (u.i << 1)
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u.f = 1.0;
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}
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return u.f;
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}
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