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c770746d70
The `half_float` test was failing with `-mcpu=cortex-a55` (native `__fp16`) due to a bad NaN bit-pattern comparison (in the case of casting a float to `__fp16`, the signaling `NaN` is quieted). There was also an inconsistency between `numeric_limits<half>::quiet_NaN()` and `NumTraits::quiet_NaN()`. Here we correct the inconsistency and compare NaNs according to the IEEE 754 definition. Also modified the `bfloat16_float` test to match. Tested with `cortex-a53` and `cortex-a55`.