7f08503a3b
This PR adds `arith.scaling_truncf` and `arith.scaling_extf` operations
which supports the block quantization following OCP MXFP specs listed
here
https://www.opencompute.org/documents/ocp-microscaling-formats-mx-v1-0-spec-final-pdf
OCP MXFP Spec comes with reference implementation here
https://github.com/microsoft/microxcaling/tree/main
Interesting piece of reference code is this method `_quantize_mx`
7bc41952de/mx/mx_ops.py (L173).
Both `arith.scaling_truncf` and `arith.scaling_extf` are designed to be
an elementwise operation. Please see description about them in
`ArithOps.td` file for more details.
Internally,
`arith.scaling_truncf` does the
`arith.truncf(arith.divf(input/(2^scale)))`. `scale` should have
necessary broadcast, clamping, normalization and NaN propagation done
before callling into `arith.scaling_truncf`.
`arith.scaling_extf` does the `arith.mulf(2^scale, input)` after taking
care of necessary data type conversions.
CC: @krzysz00 @dhernandez0 @bjacob @pashu123 @MaheshRavishankar
@tgymnich
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Co-authored-by: Prashant Kumar <pk5561@gmail.com>
Co-authored-by: Krzysztof Drewniak <Krzysztof.Drewniak@amd.com>