pengfei added a comment. I sent out this patch mainly for PoC of the ABI changes, I'll fix the performance regressions in next phase. LLVM was using a different calling conversion on x86 when passing and returning half type. It conflicts with current X86 psABI. I have evaluated the risk internally and think the change of ABI has low risk due to Clang doesn't use such calling conversion. But I may not be thoughtful enough. Questions and comments are appreciated.
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