Messages in this thread |  | | Date | Wed, 10 Jan 2001 17:25:05 +0100 | From | Pauline Middelink <> | Subject | Re: * 4 converted to << 2 for networking code |
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On Wed, 10 Jan 2001 around 18:25:46 +0100, antirez wrote: > On Wed, Jan 10, 2001 at 04:11:46PM +0100, Jakob ?stergaard wrote: > > On most processors <<2 is slower than *4. It's outright stupid to > > write <<2 when we mean *4 in order to optimize for one out of a > > gazillion supported architectures - even more so when the compiler > > for the one CPU where <<2 is faster, will actually generate a shift > > instead of a multiply as a part of the standard optimization. > > Hug, ok, so all the << 2 already in should be changed in *4. > My point is that it is better to use only << 2 or *4, selecting > the better form.
Well, better not change things so they look like:
#define MSG_BLA1 (1<<1) #define MSG_BLA2 (1*4) #define MSG_BLA3 (1<<3)
as a result... :)
Met vriendelijke groet, Pauline Middelink -- GPG Key fingerprint = 2D5B 87A7 DDA6 0378 5DEA BD3B 9A50 B416 E2D0 C3C2 For more details look at my website http://www.polyware.nl/~middelink - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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