diff options
Diffstat (limited to 'sysdeps/m68k/fpu/__math.h')
| -rw-r--r-- | sysdeps/m68k/fpu/__math.h | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/sysdeps/m68k/fpu/__math.h b/sysdeps/m68k/fpu/__math.h index 92487f9b04..5dc4d2e066 100644 --- a/sysdeps/m68k/fpu/__math.h +++ b/sysdeps/m68k/fpu/__math.h @@ -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; \ } \ |