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src/aubio_priv.h: IS_DENORMAL also for negative ones, CEIL_DENORMAL for anything below 2.e-42

--- a/src/aubio_priv.h

+++ b/src/aubio_priv.h

@@ -197,10 +197,14 @@

 #define VERY_SMALL_NUMBER 2.e-42 //1.e-37

-#define IS_DENORMAL(f) f < VERY_SMALL_NUMBER

+/** if ABS(f) < VERY_SMALL_NUMBER, returns 1, else 0 */

+#define IS_DENORMAL(f) ABS(f) < VERY_SMALL_NUMBER

+/** if ABS(f) < VERY_SMALL_NUMBER, returns 0., else f */

 #define KILL_DENORMAL(f)  IS_DENORMAL(f) ? 0. : f

-#define CEIL_DENORMAL(f)  IS_DENORMAL(f) ? VERY_SMALL_NUMBER : f

+

+/** if f > VERY_SMALL_NUMBER, returns f, else returns VERY_SMALL_NUMBER */

+#define CEIL_DENORMAL(f)  f < VERY_SMALL_NUMBER ? VERY_SMALL_NUMBER : f

 #define SAFE_LOG10(f) LOG10(CEIL_DENORMAL(f))

 #define SAFE_LOG(f)   LOG(CEIL_DENORMAL(f))