Author: Bo Persson
Date: 12:50:35 02/12/03
Go up one level in this thread
On February 12, 2003 at 03:03:56, Matt Taylor wrote:
>
>I've never gotten VC to generate cmov, even after enabling every optimization
>flag I could find.
It doesn't!
MS doesn't want to generate programs that will fail to run on Windows on any
IA-32 processor. The P6 switch just affects the instruction scheduling weights
to favor the P6 family. This might make the program run slightly slower on a
386, but it *will* run.
>It will generate setcc which is often just as useful.
Because that's a good old 386 instruction.
> I was
>sorely disappointed to discover that the latency of setcc on Pentium 4 is 5
>cycles. It can only be issued every 1.5 cycles.
>
From what I heard, the VC7.1 ("real-soon-now") will have additional P4
optimizations available. No details at hand.
Bo Persson
bop2@telia.com
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