Commits on Oct 1, 2024

1. [APFloat] Add APFloat support for E8M0 type …

   This patch adds an APFloat type for unsigned E8M0 format.
   This format is used for representing the "scale-format"
   in the MX specification:
   https://www.opencompute.org/documents/ocp-microscaling-formats-mx-v1-0-spec-final-pdf
   
   This format does not support {Inf, denorms, zeroes}.
   Like FP32, this format's exponents are 8-bits (all bits here)
   and the bias value is 127. However, it differs from IEEE-FP32
   in that the minExponent is -127 (instead of -126).
   There are updates done in the APFloat utility functions
   to handle these constraints for this format.
   
   * The bias calculation is different and convertIEEE* APIs
     are updated to handle this.
   * Since there are no significand bits, the
     isSignificandAll{Zeroes/Ones} methods are updated accordingly.
   * Although the format does not have any precision, the precision
     bit in the fltSemantics is set to 1 for consistency with
     APFloat's internal representation.
   * Many utility functions are updated to handle the fact that this
     format does not support Zero.
   * Provide a separate initFromAPInt() implementation to
     handle the quirks of the format.
   * Add specific tests to verify the range of values for this format.
   
   Signed-off-by: Durgadoss R <durgadossr@nvidia.com>

   

   durga4github committed Oct 1, 2024
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