在 2025-9-14 08:50, Trevor Gross 写道:
For MinGW on x86-64, GCC currently passes and returns `_Float16` in GPRs. Microsoft does not specify an ABI for the type so this is purely an extension; however, there are a few reasons the current ABI is not ideal:1. `float` and `double` are both passed and returned in xmm registers under the MSVC ABI, there isn't any reason for `_Float16` to deviate. 2. `_Float16` is returned in xmm0 on Windows x86-32 by both GCC and Clang. 2. There is a platform-natural ABI with AVX512-FP16, which requires half-precision operands to be in vector registers. 3. System V uses vector registers for `_Float16`.
these numbers should read 1, 2, 3, 4 instead of 1, 2, 2, 3. -- Best regards, LIU Hao
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