yaxunl added a comment. This change causes regressions for CUDA/HIP. As single-source language, CUDA/HIP code contains both device and host code. It has separate compilation for host and device. In host compilation, device function is parsed but not emitted in IR. The device function may have _Float16 argument, which is fine if device target supports it. Host compilation should not diagnose use of _Float16 in device functions. However, current implementation diagnose any _Float16 usage in host compilation.
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