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(__frexp): Don't raise invalid exception on infinite value.

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(__m81_test, __M81_COND_NAN, __M81_COND_INF, __M81_COND_NEG,
__M81_COND_ZERO): New definitions.
This commit is contained in:
Ulrich Drepper 1997-05-07 15:26:19 +00:00
parent e9b08b8835
commit 08c2dbb9a2
1 changed files with 20 additions and 1 deletions
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21
sysdeps/m68k/fpu/__math.h
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@ -153,6 +153,21 @@ __internal_inline_functions (float,f)
__internal_inline_functions (long double,l)
#undef __internal_inline_functions
/* Get the m68881 condition codes, to quickly check multiple conditions. */
static __inline__ unsigned long
__m81_test (long double __val)
{
unsigned long __fpsr;
__asm ("ftst%.x %1; fmove%.l %/fpsr,%0" : "=dm" (__fpsr) : "f" (__val));
return __fpsr;
}
/* Bit values returned by __m81_test. */
#define __M81_COND_NAN (1 << 24)
#define __M81_COND_INF (2 << 24)
#define __M81_COND_ZERO (4 << 24)
#define __M81_COND_NEG (8 << 24)
#endif /* __LIBC_M81_MATH_INLINES */
/* The rest of the functions are available to the user. */
@ -163,8 +178,12 @@ __m81_u(__CONCAT(__frexp,s))(float_type __value, int *__expptr) \
{ \
float_type __mantissa, __exponent; \
int __iexponent; \
if (__value == 0.0) \
unsigned long __fpsr; \
__asm("ftst%.x %1\n" \
"fmove%.l %/fpsr, %0" : "=dm" (__fpsr) : "f" (__value)); \
if (__fpsr & (7 << 24)) \
{ \
/* Not finite or zero. */ \
*__expptr = 0; \
return __value; \
} \