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DirectX 12 support on pre SSE4.2 CPUs

Question asked by tapek on May 12, 2016
Latest reply on Oct 25, 2016 by cbd

On latest hotfix drivers (16.4.2,16.5.1,16.5.2) I'm noticed that all DX12 apps exit to desktop so I debugged one of apps an noticed this:


(8b8.294): Illegal instruction - code c000001d (first chance)

(8b8.294): Illegal instruction - code c000001d (!!! second chance !!!)

*** WARNING: Unable to verify checksum for C:\WINDOWS\SYSTEM32\amdxc64.dll

*** ERROR: Symbol file could not be found.  Defaulted to export symbols for C:\WINDOWS\SYSTEM32\amdxc64.dll -


00007ffd`a2776f0e f30fb8436c      popcnt  eax,dword ptr [rbx+6Ch] ds:00000000`1cc002fc=00000001


Instruction popcnt is SSE 4.2 instruction, so my question is: DX12 is supported on non-SSE 4.2 CPU or not ? I think NVIDIA drivers works fine on non-SSE 4.2 CPUs