23642281318
85%
master: 84%

Ran 27 Mar 2026 11:05AM UTC

Jobs 1

Files 629

Run time 1min

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Committed 27 Mar 2026 10:36AM UTC coverage: 84.376% (-0.02%) from 84.393%

Build # 23642281318

Build Type

push

github

Committed by

web-flow

Commit Message

feat(ucalc): error propagation tracing command (#621) (#640)

Add `trace <expr>` command that shows each arithmetic operation with its
ULP error vs quad-double reference and rounding direction (up/down/exact).
Detects catastrophic cancellation in subtractions where operands share
many leading digits. Enables answering "where did precision go?" without
writing C++.

Implementation:
- TraceStep struct and recording hooks in ExpressionEvaluator
- Each binary op (+-*/^) and unary op (negate, sqrt, sin, cos, etc.)
  records operands, result, and native representations when tracing
- Reference values computed in qd for ULP error and rounding analysis
- Cancellation detection flags subtractions losing 3+ significant digits
- Fix compute_ulp to round input to nearest representable before probing

Output formats: plain (human-readable), --json (structured), --csv, --quiet

Test suite:
- 3 new regression tests (step recording, function tracing, disabled default)
- New example script: 11_agent_trace_analysis.ucalc
- 20/20 CTests pass on both gcc and clang

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

Coverage Stats

44403 of 52625 relevant lines covered (84.38%)

6121726.43 hits per line

Coverage Regressions

Lines	Coverage	∆	File
10	31.43	-3.57%	include/sw/universal/verification/test_suite_randoms.hpp
1	81.25	-0.22%	include/sw/universal/number/posit1/specialized/posit_16_1.hpp

Jobs

ID	Job ID	Ran	Files	Coverage
1	23642281318.1	27 Mar 2026 11:05AM UTC	629	84.38	GitHub Action Run

stillwater-sc / universal / 23642281318
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master: 84%

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