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-rw-r--r--tools/regression/lib/msun/test-fenv.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/tools/regression/lib/msun/test-fenv.c b/tools/regression/lib/msun/test-fenv.c
index 71e8eed..0ea6e42 100644
--- a/tools/regression/lib/msun/test-fenv.c
+++ b/tools/regression/lib/msun/test-fenv.c
@@ -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);
}
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