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Diffstat (limited to 'newlib/libm/mathfp/sf_isnan.c')
-rw-r--r-- | newlib/libm/mathfp/sf_isnan.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/newlib/libm/mathfp/sf_isnan.c b/newlib/libm/mathfp/sf_isnan.c new file mode 100644 index 000000000..ac557a6b8 --- /dev/null +++ b/newlib/libm/mathfp/sf_isnan.c @@ -0,0 +1,48 @@ + +/* @(#)z_isnanf.c 1.0 98/08/13 */ +/****************************************************************** + * isnanf + * + * Input: + * x - pointer to a floating point value + * + * Output: + * An integer that indicates if the number is NaN. + * + * Description: + * This routine returns an integer that indicates if the number + * passed in is NaN (1) or is finite (0). + * + *****************************************************************/ + +#include "fdlibm.h" +#include "zmath.h" + +int +_DEFUN (isnanf, (float), + float x) +{ + __int32_t wx; + int exp; + + GET_FLOAT_WORD (wx, x); + exp = (wx & 0x7f800000) >> 23; + + if ((exp == 0x7f8) && (wx & 0x7fffff)) + return (1); + else + return (0); +} + + +#ifdef _DOUBLE_IS_32BITS + +int +_DEFUN (isnan, (double), + double x) +{ + return isnanf((float) x); +} + +#endif /* defined(_DOUBLE_IS_32BITS) */ + |