On Tue, Aug 8, 2023 at 9:58 AM liuhongt wrote:
>
> Don't access leaf 7 subleaf 1 unless subleaf 0 says it is
> supported via EAX.
>
> Intel documentation says invalid subleaves return 0. We had been
> relying on that behavior instead of checking the max sublef number.
>
> It appears that some Sand
On Tue, Aug 08, 2023 at 03:56:00PM +0800, liuhongt via Gcc-patches wrote:
> + /* According to document, when subleaf is invliad, EAX,EBX,ECX,EDX
> should
s/invliad/invalid/
Jakub
Don't access leaf 7 subleaf 1 unless subleaf 0 says it is
supported via EAX.
Intel documentation says invalid subleaves return 0. We had been
relying on that behavior instead of checking the max sublef number.
It appears that some Sandy Bridge CPUs return at least the subleaf 0
EDX value for subl
