[BUG]: CUB's c2h::gen(...) RNG utility only outputs positive non-zero floating point numbers.

[alliepiper]

Is this a duplicate?

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Type of Bug

Something else

Component

CUB

Describe the bug

The catch2 testing utilities provide a random number generator that, by default, produces random numbers in the range [numeric_limits<T>::min(), numeric_limits<T>::max()].

For floats, numeric_limits<T>::min() does not return the most negative value, but rather the smallest representable positive finite value. To cover the entire range, we should be using lowest().

However, the quick fix of changing the definition to use lowest() causes all output values to be inf, since computing random numbers with (max - lowest) * rand + lowest.

How to Reproduce

1. Inspect data produced by c2h::gen for double types. No negative or zero values appear.
2. Regenerate the data using lowest() instead of min(). All values are inf.

Expected behavior

The entire range of possible values should be sampled in the output.

Reproduction link

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Operating System

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nvidia-smi output

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NVCC version

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