Author: ngie Date: Mon Oct 26 00:07:11 2015 New Revision: 289971 URL: https://svnweb.freebsd.org/changeset/base/289971
Log: MFstable/10 r289970: MFC r289332: 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.r...@isilon.com> Reviewed by: Daniel O'Connor <dar...@dons.net.au> (earlier patch; pre-generalization) Sponsored by: EMC / Isilon Storage Division Reported by: Bill Morchin <wmorc...@isilon.com> Modified: stable/9/tools/regression/lib/msun/test-fenv.c Directory Properties: stable/9/ (props changed) stable/9/tools/ (props changed) stable/9/tools/regression/ (props changed) Modified: stable/9/tools/regression/lib/msun/test-fenv.c ============================================================================== --- stable/9/tools/regression/lib/msun/test-fenv.c Mon Oct 26 00:06:04 2015 (r289970) +++ stable/9/tools/regression/lib/msun/test-fenv.c Mon Oct 26 00:07:11 2015 (r289971) @@ -133,8 +133,35 @@ test_dfl_env(void) fenv_t env; fegetenv(&env); + +#ifdef __amd64__ + /* + * Compare the fields that the AMD [1] and Intel [2] specs say will be + * set once fnstenv returns. + * + * Not all amd64 capable processors implement the fnstenv instruction + * by zero'ing 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 implements fnstenv. + * + * 1. http://support.amd.com/TechDocs/26569_APM_v5.pdf + * 2. http://www.intel.com/Assets/en_US/PDF/manual/253666.pdf + */ + assert(memcmp(&env.__mxcsr, &FE_DFL_ENV->__mxcsr, + sizeof(env.__mxcsr)) == 0); + assert(memcmp(&env.__x87.__control, &FE_DFL_ENV->__x87.__control, + sizeof(env.__x87.__control)) == 0); + assert(memcmp(&env.__x87.__status, &FE_DFL_ENV->__x87.__status, + sizeof(env.__x87.__status)) == 0); + assert(memcmp(&env.__x87.__tag, &FE_DFL_ENV->__x87.__tag, + sizeof(env.__x87.__tag)) == 0); +#else assert(memcmp(&env, FE_DFL_ENV, sizeof(env)) == 0); #endif + +#endif assert(fetestexcept(FE_ALL_EXCEPT) == 0); } _______________________________________________ svn-src-stable-9@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-stable-9 To unsubscribe, send any mail to "svn-src-stable-9-unsubscr...@freebsd.org"
