https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054
connor horman <chorman64 at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |chorman64 at gmail dot com --- Comment #6 from connor horman <chorman64 at gmail dot com> --- According to: https://cs61.seas.harvard.edu/site/pdf/x86-64-abi-20210928.pdf > Arguments of types _Float16, float, double, _Decimal32, _Decimal64 and __m64 > are in class SSE. So `_Float16` is SSE as well.