Optimising an if statement

[jotry]

Hello,
Does anyone know which one of these two if statements that is fastest to execute?

#define ALPHA 0x01
#define BETA 0x04
#define GAMMA 0x08
#define DELTA 0x10

...

if (flag == ALPHA || flag == GAMMA)
	printf("ok!");
else
	printf("error");

if (flag & (ALPHA | GAMMA))
	printf("ok!");
else
	printf("error");

I know the first one is safer, but I think the later is faster. But I don't really know.

[quzah]

The first one and the second one are not comparible. The first one is wrong if you have more than one flag set on flag. The first one is only true if, and only if, flag is set to one flag. The second works for multiple flag sets, which is more than likely what you want.

Example: The first one fails if you have both ALPHA and BETA set. The second will give you a true result if ALPHA and BETA are set, even though you're testing for ALPHA and GAMA.

Quzah.