DOS ain't dead

SSE instructions in DOS programs? (Developers)

posted by alexfru, USA, 02.01.2019, 00:31

> What is the recomended way how to obtain whether I can use the SSE
> instructions?
> First step is clear - use the CPUID.
> But what about test whether the SSE are supported by the OS?
> Sure, I can just include some DPMI server which enables (supports) the SSE
> (cwsdpmi r7) but what about situation when already other DPMI server is
> running? Or somebody uses my program under Win95? (which does not have the
> SSE support)
>
> Internet says that it is enough to test the 9.bit and 10.bit in the CR4
> register. But "MOV CR4,AX" is a privileged instruction. So - what to do?

Try executing an instruction of interest and catch #UD.
It might be easier to do in real or virtual 8086 mode (I avoided interrupt/exception handling in protected mode under DPMI).

Complete thread:

• SSE instructions in DOS programs? - Laaca, 02.01.2019, 00:07
  • SSE instructions in DOS programs? - alexfru, 02.01.2019, 00:31
  • SSE instructions in DOS programs? - Rugxulo, 02.01.2019, 10:08
  • SSE instructions in DOS programs? - RayeR, 02.01.2019, 22:56
    • SSE instructions in DOS programs? - Laaca, 03.01.2019, 12:51
      • SSE instructions in DOS programs? - Laaca, 03.01.2019, 12:52
      • SSE instructions in DOS programs? - RayeR, 03.01.2019, 14:32
        • SSE instructions in DOS programs? - RayeR, 03.01.2019, 14:39
    • SSE instructions in DOS programs? - marcov, 04.01.2019, 23:37
      • SSE instructions in DOS programs? - Rugxulo, 12.01.2019, 23:54
        • SSE instructions in DOS programs? - RayeR, 13.01.2019, 16:44