stillwater-sc / universal / 23663759731
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feat(ucalc): rounding audit trail command (#643)

* feat(ucalc): rounding audit trail command (#623)

Add `audit <expr>` command that shows every rounding event with:
- Signed ULP error (positive = rounded up, negative = rounded down)
- Ties-to-even detection (when ULP error is exactly 0.5)
- Cumulative signed error drift across all operations
- Summary statistics: rounding events count, max |ULP| error, net drift

Builds on the trace infrastructure but focuses on rounding analysis
rather than operation-level tracing. Useful for understanding error
accumulation patterns and detecting systematic rounding bias.

Supports all output formats: plain, --json, --csv, --quiet.
20/20 CTests pass on both gcc and clang.

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

* fix(ucalc): fix misleading trace/audit rounding display

The trace output showed native_rep (display-truncated) values alongside
"exact" labels, creating contradictions. For example, bfloat16's 1.0625
displayed as "1.1" next to "exact: 1.086..." made ROUNDED DOWN look
wrong when it was correct (1.0625 < 1.0703).

Three changes:

1. Show actual decimal values for result and reference on separate lines
   when rounding occurred, so direction is self-evident from comparing
   the two numbers. Exact results still show the compact native_rep.

2. Rename "exact" to "reference" everywhere (trace, audit, cancel) --
   the qd replay of already-rounded operands is a higher-precision
   reference, not the mathematically exact result of the original inputs.

3. Move rounding direction out of confusing parentheticals into a clear
   standalone annotation line.

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

* feat(ucalc): show reference precision in trace and audit output

Add "reference precision: quad-double" (or whatever the ref type is)
to the trace and audit plain text summaries, and "reference_type" to
the JSON output. Users can now see what precision is back... (continued)

44400 of 52625 relevant lines covered (84.37%)

6121932.11 hits per line

Coverage Regressions

Lines Coverage ∆ File
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 -0.67% include/sw/universal/number/posit1/specialized/posit_16_1.hpp
Jobs
ID Job ID Ran Files Coverage
1 23663759731.1 629
84.37
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Source Files on build 23663759731