On Thu, 27 Jan 2000, Chris Sears wrote:
>
> Mike,
>
> here is the code from <linux/linkage.h>
>
> #if !defined(__i486__) && !defined(__i586__)
> #define __ALIGN .align 4,0x90
> #define __ALIGN_STR ".align 4,0x90"
> #else /* __i486__/__i586__ */
> #define __ALIGN .align 16,0x90
> #define __ALIGN_STR ".align 16,0x90"
> #endif /* __i486__/__i586__ */
>
> You can see that __i686__ is missing from the list
> so it defaults to the i386 case.
Yes.
> The 16 should be 32 as cache.h points out.
I don't think so. (but am not positive)
I don't know what the pIII prefers, but I did 5 test runs with lmbench
today on my p5 with 0,4,16 and 2 additionals with different alignment
CFLAGS. The difference in lmbench numbers was ~nil for all 5 runs.
The only difference at all (gcc-2.95-2) was that -malign-[foo]=0, gave
me a 48k ram rebate. My p5 doesn't care about __ALIGN.. and I get free
ram by generally not aligning. :-)
I haven't tested my pIII yet to see if it cares, and if so, what it
prefers. Someone else probably has.
-Mike
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