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H A D | fenv_test.c | diff 289332 Wed Oct 14 18:30:22 MDT 2015 ngie Fix test-fenv:test_dfl_env when run on some amd64 CPUs Compare the fields that the AMD [1] and Intel [2] specs say will be set once fnstenv returns. Not all amd64 capable processors zero out the env.__x87.__other field (example: AMD Opteron 6308). The AMD64/x64 specs aren't explicit on what the env.__x87.__other field will contain after fnstenv is executed, so the values in env.__x87.__other could be filled with arbitrary data depending on how the CPU-specific implementation of fnstenv. 1. http://support.amd.com/TechDocs/26569_APM_v5.pdf 2. http://www.intel.com/Assets/en_US/PDF/manual/253666.pdf Discussed with: kib, Anton Rang <anton.rang@isilon.com> Reviewed by: Daniel O'Connor <darius@dons.net.au> (earlier patch; pre-generalization) MFC after: 1 week Sponsored by: EMC / Isilon Storage Division Reported by: Bill Morchin <wmorchin@isilon.com> |
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