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    • Gareth Hughes's avatar
    • Gareth Hughes's avatar
      More correct test for the availability of SSE on a Pentium III · 8a341f4d
      Gareth Hughes authored
      processor, or any that specifies XMM in the CPUID features.  We perform
      the equivalent of testing CR4.OSFXSR to verify the operating system
      supports the extended FPU save and restore required for SSE.  We also
      perform the equivalent of testing CR4.OSXMMEXCPT to verify the operating
      system supports unmasked SIMD FPU exceptions.
      
      All changes to the signal handlers and SIMD FPU control word are
      restored after the testing is complete.
      
      Tested on the following kernels:
        - 2.2.14-5.0 kernel from RedHat 6.2 that includes their SSE patch
        - 2.4.0-test11 kernel configured for PPro/PII processor (no SSE)
        - 2.4.0-test11 kernel configured for PIII processor (with SSE)
      8a341f4d
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