Yilong Guo 119af24d54 c11_atomics: unify host half representation and conversion with wrapper class (#2503) ...

Introduce `HostHalf` wrapper class to eliminate explicit
`cl_half_from_float`
and `cl_half_to_float` conversions throughout the test code. The wrapper
provides semantic value constructors/operators and automatic
conversions,
simplifying half-precision arithmetic operations.

Key improvements:
- `HostHalf` class with operator overloading for arithmetic and
comparisons
- Type traits `is_host_atomic_fp_v` and `is_host_fp_v` for generic FP
handling
- Unified floating-point atomic operations (add/sub/min/max/exchange)
- Removed 300+ lines of half-specific conditional branches
- Consistent calculation for all FP types

2025-12-16 08:37:33 -08:00

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