Emulator Issues #12332: Zen 3 is capable of using PDEP/PEXT without emulation through microcode - Emulator - Dolphin bug tracker

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Emulator Issues #12332

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Zen 3 is capable of using PDEP/PEXT without emulation through microcode

Added by raiton over 3 years ago. Updated over 3 years ago.

Status:

Invalid

Priority:

Normal

Assignee:

% Done:

Operating system:

N/A

Issue type:

Bug

Milestone:

Regression:

Relates to usability:

Relates to performance:

Easy:

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Regression start:

Fixed in:

Description

Reference: https://de.dolphin-emu.org/download/dev/master/5.0-11590/

This PR shows that PDEP/PEXT is disabled for AMD Zen because it's not supported nativley.

This is not the case anymore according to the developer documenation for Zen3 processors:

"The AMD family 19h processor has native ALU support for PDEP/PEXT, so one such instruction can
be sustained per cycle, with a three-cycle latency for producing the result. Software that uses different
codepaths for processors with fast and slow PDEP/PEXT instructions should choose the fast
PDEP/PEXT codepath for family 19h processors." (Page 40, 2.10.2 Execution Units)

https://developer.amd.com/resources/developer-guides-manuals/ (Software Optimization Guide for AMD Family 19h Processors (PUB))

My question is did this PR also disable PDEP/PEXT for Zen3 family?