On 04/21/2013 09:49 AM, Andi Kleen wrote:
> From: Andi Kleen <[email protected]>
>
> The AMD K6 errata check relies on timing a indirect call.
> But the way it was written it could be optimized to a direct call.
> Force gcc to actually do a indirect call and not just
> constant resolve the target address.
>
> Found during code review, no runtime testing due to lack
> of hardware.
Maybe it would be even better to just code the indirect call instruction
in assembly?
Something like:
asm volatile("call *%0"
: : "r" (vide)
: "eax", "ecx", "edx");
Gotta love the metal mask(?) fix without bumping the stepping number...
-hpa
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