stillwater-sc / universal / 23679776732
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feat(ucalc): block format simulation command (#647)

* feat(ucalc): block format simulation command (#628)

Add `block <format> <data>` command showing MX/NV block decomposition:
shared scale, per-element encoding, decoded values, and per-element
error. Supports both inline vectors and CSV file loading.

Supported block formats:
- mxfp4 (e2m1, 32-element blocks, e8m0 power-of-two scale)
- mxfp6 (e3m2, 32-element blocks, e8m0 scale)
- mxfp8 (e4m3, 32-element blocks, e8m0 scale)
- mxfp8e5m2 (e5m2, 32-element blocks, e8m0 scale)
- nvfp4 (e2m1, 16-element blocks, e4m3 fractional scale)

NVFP4 supports optional tensor_scale=N parameter for the two-level
NVIDIA scaling model.

Reports per-block scale and per-element decomposition, plus aggregate
RMSE and QSNR. All output formats: plain, --json, --csv, --quiet.
21/21 CTests pass on gcc.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(ucalc): omit tensor_scale from JSON for MX block formats

tensor_scale only applies to nvblock (NVFP4). MX formats use their
own internal e8m0 scale. Emitting tensor_scale=1.0 for mxfp4/mxfp6/
mxfp8 was misleading.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(ucalc): add mxfp6e2m3 and mxint8 to block format dispatcher

These aliases exist in mxfloat_fwd.hpp but were missing from the
block command's format dispatch. Also updated the error message to
list all 7 available formats.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

44449 of 52659 relevant lines covered (84.41%)

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