31910503213
85%
master: 84%

Ran 15 Aug 2026 10:26PM UTC

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Run time 1min

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Committed 15 Aug 2026 09:49PM UTC coverage: 85.463% (-0.02%) from 85.483%

Build # 31910503213

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push

github

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web-flow

Commit Message

test: add the classic vs floatcascade multi-component performance benchmarks (#1316)

Adds benchmark/performance/arithmetic/highprecision/: four programs plus a shared harness measuring what the floatcascade<N> generalization costs relative to the classic hand-specialized dd and qd.

  benchmark_hp_scalar       scalar operator latency, conversions
  benchmark_hp_kernels      dot / axpy / matmul / horner, per multiply-add
  benchmark_hp_mathlib      sqrt, exp, log, sin, cos
  benchmark_hp_equivalence  do the two families compute the same answer

Each measurement calibrates its own operation count to a wall-clock window and
takes the best of 3; every component of every result is stored through a
volatile sink, because consuming only the leading limb lets the compiler prove
the trailing limbs dead.

Results (i7-12700K, gcc 13.3, -O3, pinned) are recorded in the directory README:
cascade matches or beats classic on add/subtract/divide, loses on multiply
(1.3x at N=2, 8.0x at N=4), and the arithmetic is bit-identical so those rows
are like-for-like. The scalar add and multiply verdicts flip between gcc and
clang. qd_cascade sqrt/exp/log are slower than qd and lose 13-15 digits.

Closes #1315. Defects surfaced by the guardrail: #1317, #1318, #1319.

Coverage Stats

42392 of 49603 relevant lines covered (85.46%)

7311146.3 hits per line

Coverage Regressions

Lines	Coverage	∆	File
10	31.43	-3.57%	include/sw/universal/verification/test_suite_randoms.hpp

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ID	Job ID	Ran	Files	Coverage
1	31910503213.1	15 Aug 2026 10:26PM UTC	617	85.46	GitHub Action Run

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