c7ec6e19d5446a448f888b33f66316cf2ec6ecae made LLVM adhere to the x86
psABI and pass bf16 in SSE registers instead of GPRs. This breaks the
custom versions of runtime functions we have for bf16 conversion. A
great fix for this would be to use __bf16 types instead which carry the
right ABI, but that type isn't widely available.
Instead just pretend it's a 32 bit float on the ABI boundary and
carefully cast it to the right type.
Fixes#57042
This adds weak versions of the truncation libcalls in case the runtime
environment doesn't have them.
Differential Revision: https://reviews.llvm.org/D128091
This is the first PR to add `F16` and `BF16` support to the sparse codegen. There are still problems in supporting these two data types, such as `BF16` is not quite working yet.
Add tests cases.
Reviewed By: aartbik
Differential Revision: https://reviews.llvm.org/D127010
