#define LTT_TIME_H
#include <glib.h>
-
+#include <ltt/compiler.h>
typedef struct _LttTime {
unsigned long tv_sec;
#define NANOSECONDS_PER_SECOND 1000000000
+#define SHIFT_CONST 1.07374182400631629848
static const LttTime ltt_time_zero = { 0, 0 };
LttTime res;
res.tv_sec = t1.tv_sec - t2.tv_sec;
res.tv_nsec = t1.tv_nsec - t2.tv_nsec;
- if(t1.tv_nsec < t2.tv_nsec) {
+ /* unlikely : given equal chance to be anywhere in t1.tv_nsec, and
+ * higher probability of low value for t2.tv_sec, we will habitually
+ * not wrap.
+ */
+ if(unlikely(t1.tv_nsec < t2.tv_nsec)) {
res.tv_sec--;
res.tv_nsec += NANOSECONDS_PER_SECOND;
}
LttTime res;
res.tv_nsec = t1.tv_nsec + t2.tv_nsec;
res.tv_sec = t1.tv_sec + t2.tv_sec;
- if(res.tv_nsec >= NANOSECONDS_PER_SECOND) {
+ /* unlikely : given equal chance to be anywhere in t1.tv_nsec, and
+ * higher probability of low value for t2.tv_sec, we will habitually
+ * not wrap.
+ */
+ if(unlikely(res.tv_nsec >= NANOSECONDS_PER_SECOND)) {
res.tv_sec++;
res.tv_nsec -= NANOSECONDS_PER_SECOND;
}
return res;
}
-
+/* Fastest comparison : t1 > t2 */
static inline int ltt_time_compare(LttTime t1, LttTime t2)
{
- if(t1.tv_sec > t2.tv_sec) return 1;
- if(t1.tv_sec < t2.tv_sec) return -1;
- if(t1.tv_nsec > t2.tv_nsec) return 1;
- if(t1.tv_nsec < t2.tv_nsec) return -1;
- return 0;
+ int ret=0;
+ if(likely(t1.tv_sec > t2.tv_sec)) ret = 1;
+ else if(unlikely(t1.tv_sec < t2.tv_sec)) ret = -1;
+ else if(likely(t1.tv_nsec > t2.tv_nsec)) ret = 1;
+ else if(unlikely(t1.tv_nsec < t2.tv_nsec)) ret = -1;
+
+ return ret;
}
#define LTT_TIME_MIN(a,b) ((ltt_time_compare((a),(b)) < 0) ? (a) : (b))
if(t1.tv_sec > MAX_TV_SEC_TO_DOUBLE)
g_warning("Precision loss in conversion LttTime to double");
#endif //EXTRA_CHECK
- return ((double)t1.tv_sec * NANOSECONDS_PER_SECOND) + (double)t1.tv_nsec;
+ return ((double)t1.tv_sec * (double)NANOSECONDS_PER_SECOND) + (double)t1.tv_nsec;
}
g_warning("Conversion from non precise double to LttTime");
#endif //EXTRA_CHECK
LttTime res;
- res.tv_sec = t1/(double)NANOSECONDS_PER_SECOND;
+ //res.tv_sec = t1/(double)NANOSECONDS_PER_SECOND;
+ res.tv_sec = (guint64)(t1 * SHIFT_CONST) >> 30;
res.tv_nsec = (t1 - (res.tv_sec*NANOSECONDS_PER_SECOND));
return res;
}