25 lines
455 B
C
25 lines
455 B
C
// adapted from the rintf() function from musl-1.1.16
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#include "libm.h"
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float nearbyintf(float x)
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{
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union {float f; uint32_t i;} u = {x};
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int e = u.i>>23 & 0xff;
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int s = u.i>>31;
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float_t y;
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if (e >= 0x7f+23)
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return x;
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if (s)
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y = x - 0x1p23f + 0x1p23f;
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else
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y = x + 0x1p23f - 0x1p23f;
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wfloat-equal"
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if (y == 0)
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return s ? -0.0f : 0.0f;
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#pragma GCC diagnostic pop
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return y;
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}
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