icx 2022 mconditional-branch, Qconditional-branch

[mochongli]

https://www.intel.com/content/www/us/en/develop/documentation/cpp-compiler-developer-guide-and-reference/top/compiler-reference/compiler-options/code-generation-options/mconditional-branch-qconditional-branch.html all-fix-cmov Tells the compiler to treat any path where speculative execution of a memory load creates vulnerability (if mispredicted). The compiler automatically adds mitigation code along any vulnerable paths found, but it uses a different method then the one used for all-fix (or all-fix-lfence). This method uses CMOVcc instruction execution, which constrains speculative execution. Thus, it is used for keeping track of the predicate value, which is updated on each conditional branch. To prevent Spectre v.1 attack, each memory load that is potentially vulnerable is bitwise ORed with the predicate to mask out the loaded value if the code is on a mispredicted path. This is analogous to the Clang compiler's option to do Speculative Load Hardening. This setting is only supported on Intel® 64 architecture-based systems. Why is it not in icx 2022?

[SeshaP_Intel]

Hi,

Thank you for your feedback. We have provided your feedback to the relevant team. 

At this moment there is no visibility of when it will be implemented and available for use.

Please let me know if we can go ahead and close this case.

Thanks and Regards,

Pendyala Sesha Srinivas

[SeshaP_Intel]

Hi,

We are closing this issue for now. If you need any additional information, please post a new question as this thread will no longer be monitored by Intel.

Thanks and Regards,

Pendyala Sesha Srinivas