Umang Yadav ffa5ce04d0 Add arith expansion of f8E8M0 type for extf/trunc ops (#140332) ...

F8E8M0 floating type is supposed to represent biased exponent bits of
F32 type in OCP Micro scaling floating point formats.


https://www.opencompute.org/documents/ocp-microscaling-formats-mx-v1-0-spec-final-pdf

This PR expands `arith.truncf` and `arith.extf` to support this
behavior.

For the `arith.truncf` thing to note here is that F8E8M0FNU type has one
NaN representation which is encoded as `0xFF`. Therefore alll kinds of
NaNs and +/-Inf in Float32Type would map to NaN in F8E8M0FNU. F8E8M0FNU
doesn't have a sign bit therefore it is a lossy and irreversible
downcast.

cc: @krzysz00  @MaheshRavishankar @Muzammiluddin-Syed-ECE

2025-05-22 15:36:00 -05:00

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