Re: MSEC_TO_JIFFIES is messed up...

From: Andreas Schwab
Date: Wed May 12 2004 - 16:57:33 EST

"J. Bruce Fields" <bfields@xxxxxxxxxxxx> writes:

> If gcc really optimizes that to just the identity function, then surely
> that's a gcc bug? Multiplication is left-associative, so i * 1000 /
> 1000 = (i * 1000) / 1000, but (i * 1000) should be zero for any i
> divisible by i^(sizeof(int) - 12).

Signed integer overflow is undefined in C, so the compiler is allowed to
assume it does not happen.


Andreas Schwab, SuSE Labs, schwab@xxxxxxx
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at