int ceil_log2(int x)
{
+#if defined(__GNUC__)
+ return x > 1 ? (8*sizeof(int)) - __builtin_clz(x-1) : 0;
+#else
if (x <= 0)
return 0;
-
for (int i = 0; i < 32; i++)
if (((x-1) >> i) == 0)
return i;
-
log_abort();
+#endif
}
std::string stringf(const char *fmt, ...)