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add legacy sys/ttydefaults.h header
[oweals/musl.git]
/
src
/
math
/
ilogbf.c
1
#include <limits.h>
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#include "libm.h"
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int ilogbf(float x)
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{
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union fshape u = {x};
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int e = u.bits>>23 & 0xff;
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if (!e) {
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u.bits <<= 9;
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if (u.bits == 0) {
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FORCE_EVAL(0/0.0f);
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return FP_ILOGB0;
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}
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/* subnormal x */
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for (e = -0x7f; u.bits < (uint32_t)1<<31; e--, u.bits<<=1);
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return e;
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}
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if (e == 0xff) {
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FORCE_EVAL(0/0.0f);
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return u.bits<<9 ? FP_ILOGBNAN : INT_MAX;
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}
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return e - 0x7f;
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}