[issue24999] Segfault in test_re.test_sre_character_class_literals() when Python is compiled by ICC

[Tim Peters]

Tim Peters added the comment:

If it were treating doubles as floats, you'd get a lot more failures than this.

Many of these look like clear cases of treating _denormal_ doubles as 0.0, though.  I have no experience with ICC, but a quick Google search suggests ICC flushes denormals to 0.0 by default, and the compiler flag "no-ftz" (no flush-to-zero) is needed to stop that; e.g., see

https://software.intel.com/sites/default/files/article/326703/fp-control-2012-08.pdf

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