On Wed, May 05, 1999 at 06:20:41PM +0200, christophe leroy wrote:
> On a SA1100, the following prog last 13 seconds
>
> when I use
> ldr r0,.L1
> ldr r1,.L2
> eor r0,r0,r3
> eor r1,r1,r3
> instead, it last 10 seconds.
>
> Is that normal ? There should be no issue delay on ldr, shouldnt it ?
>
> ldr r0,.L1
> eor r0,r0,r3
> ldr r1,.L2
> eor r1,r1,r3
Yes, this is normal; LDRs have a 1 cycle delay if the register is used
immediately. Last I heard; GCC did not reorder instructions to take
advantage of this.
--
Matthew Wilcox <[EMAIL PROTECTED]>
"Windows and MacOS are products, contrived by engineers in the service of
specific companies. Unix, by contrast, is not so much a product as it is a
painstakingly compiled oral history of the hacker subculture." - N Stephenson
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