stillwater-sc / universal / 23216480936

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Commit Message

feat(blas): implement data file translation between type sets (#588)

* feat(blas): implement data file translation between type sets

Add translator that reads data files with a source type registry,
converts values through double intermediate, and writes with a
target type registry.

New files:
- translator.hpp: translate<SrcTypes, DstTypes>() function,
  type_map with make_mapping<Src, Dst>(), find_mapping()
- translation.cpp: test suite for identity, widening (float->double),
  narrowing (double->float), unmapped type, and multi-dataset

The translator enables converting data files between client type
sets (e.g., NVIDIA TF32 -> AMD BF16) without requiring both clients
to share the same type configurations.

Resolves #584

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(blas): replace double intermediate with direct type conversion

The translator was converting all values through double, which would
truncate dd (~32 digits) and qd (~64 digits) to ~15 digits.

Replace with a nested dispatch that reads source tokens as strings,
parses as SrcT, and converts directly to DstT via static_cast. This
uses each type's native conversion operators which preserve multi-
component values for dd/qd.

The blocktriple<> type is the ideal intermediate for types that
support it (cfloat, posit, fixpnt), but dd/qd do not yet implement
blocktriple conversion. Once they do, the translator can leverage
blocktriple<max(src_fbits, dst_fbits), REP> for lossless conversion.
For now, direct SrcT -> DstT conversion is correct and preserves
precision through the types' own assignment operators.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(blas): address CodeRabbit review on translator

1. Buffer output per dataset: write to ostringstream first, commit
   to output only on success. Failed source or destination dispatch
   skips the dataset without corrupting the output file.

2. Add bounds checks: nrParams > 16 from input returns false;
   dstN... (continued)

Coverage Stats

173 of 216 new or added lines in 2 files covered. (80.09%)

8 existing lines in 3 files now uncovered.

44015 of 52329 relevant lines covered (84.11%)

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