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Define it here. Handle zero, NaN and infinity specially.

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This commit is contained in:
Ulrich Drepper 1997-06-26 22:19:45 +00:00
parent fb1efdeaa7
commit 3fe409285e
1 changed files with 19 additions and 7 deletions
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26
sysdeps/m68k/fpu/s_ilogb.c
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@ -19,21 +19,33 @@
#define __LIBC_M81_MATH_INLINES
#include <math.h>
#ifndef FUNC
#define FUNC ilogb
#ifndef SUFF
#define SUFF
#endif
#ifndef float_type
#define float_type double
#endif
#define __CONCATX(a,b) __CONCAT(a,b)
#define CONCATX(a,b) __CONCAT(a,b)
#define s(name) CONCATX(name,SUFF)
#define m81(func) __m81_u(s(func))
int
__CONCATX(__,FUNC) (x)
float_type x;
s(__ilogb) (float_type x)
{
return __m81_u(__CONCATX(__,FUNC))(x);
float_type result;
unsigned long x_cond;
x_cond = __m81_test (x);
/* We must return consistent values for zero and NaN. */
if (x_cond & __M81_COND_ZERO)
return FP_ILOGB0;
if (x_cond & (__M81_COND_NAN | __M81_COND_INF))
return FP_ILOGBNAN;
__asm ("fgetexp%.x %1, %0" : "=f" (result) : "f" (x));
return (int) result;
}
#define weak_aliasx(a,b) weak_alias(a,b)
weak_aliasx (__CONCATX(__,FUNC), FUNC)
weak_aliasx (s(__ilogb), s(ilogb))