topic Hello, in Intel® ISA Extensions

Is it possible to combine CPUID and Instruction set emulation arguments in Intel SDE?

Petrov__Petar — Thu, 30 Jan 2020 07:25:28 GMT

Running `sde.exe -nhm -bmi1 1 -- TestConsole.exe` command don't take into account the `-bmi1 1` option.
It emulates `nhm` instruction set correctly but doesn't emulate the `bmi1` instruction set.
Is it possible to combine them some other way?

Best regards,

ptp

No exactly, the -nhm knob

AdyT_Intel — Thu, 30 Jan 2020 22:08:00 GMT

No exactly, the -nhm knob instructs SDE to ensure that the application use NHM ISA and that the CPUID instruction behaves as in NHM CPU.
Since the instruction compliance checks for NHM does not include BMI, you will need to either use a CPU that supports BMI (like HSW) or disable chip-check.

It you need to update emulation of the CPUID instruction to include BMI, then we have a way to do it.

Hello,

Petrov__Petar — Fri, 31 Jan 2020 07:56:25 GMT

Hello,

Thank you for the quick reply. I am developing a C# wrapper around SDE executable for testing purposes. My main goal is to be able to run some code with specific instruction sets.

It you need to update emulation of the CPUID instruction to include BMI, then we have a way to do it.

How can i update emulation of the CPUID or can i define my CPUID with custom instruction sets?

To control the emulation of

AdyT_Intel — Fri, 31 Jan 2020 15:15:23 GMT

To control the emulation of the CPUID instruction use the -cpuid_in <file> knob.
The CPUID definition file is written in a certain format.
For you purposes you should take the closest file from the kit in <kit>/misc/cpuid/<chip>/cpuid.def and copy it to a new location.
This file is like a dictionary mapping values of EAX/ECX to their expected results.
Then you can edit the certain bits you need, and specify this file to SDE.

This will become something like:
> sde -hsw -cpuid_in <mycpuid.def> -- app

You still need the HSW knob to allow executing the BMI instructions.