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34 lines
762 B
34 lines
762 B
10 years ago
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/*****************************************************************************/
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/*****************************************************************************/
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// roundf from musl-0.9.15
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/*****************************************************************************/
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/*****************************************************************************/
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#include "libm.h"
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float roundf(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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float_t y;
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if (e >= 0x7f+23)
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return x;
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if (u.i >> 31)
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x = -x;
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if (e < 0x7f-1) {
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FORCE_EVAL(x + 0x1p23f);
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return 0*u.f;
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}
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y = (float)(x + 0x1p23f) - 0x1p23f - x;
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if (y > 0.5f)
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y = y + x - 1;
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else if (y <= -0.5f)
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y = y + x + 1;
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else
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y = y + x;
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if (u.i >> 31)
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y = -y;
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return y;
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}
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