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Added shortcut encoding for linear/log powerlosses in test-runner

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The previous encoding was a bit problematic with our linear and log
heuristics, which can grow thousands of powerlosses deep. You know you
have a problem when you're copying a test id that spans a dozen lines.

It also meant we were spending O(n^2) time just encoding powerloss ids:

  before: 942.68s
  after:  921.94s (-2.2%)

This new encoding takes advantage of the unused characters in our leb16
encoding, with an 'x' prefix indicating linear-heuristic powerlosses
and a 'y' prefix indicating log-heuristic powerlosses ('w' is used for
negative leb16s).

Before:

  - explicit: 42q2q2
  - linear:   123456789abcdefg1h1i1j1k1l1m1n1o1p1q1r1s1t1u1v1
  - log:      1248g1g2g4g8gg1gg2gg4gg8

After:

  - explicit: 42q2q2
  - linear:   xg2
  - log:      yc
This commit is contained in:
Christopher Haster
2023-11-29 17:59:37 -06:00
parent d485795336
commit 4da7c88eb0
3 changed files with 185 additions and 178 deletions
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runners/test_runner.h
+1 -1
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@@ -74,7 +74,7 @@ extern const size_t test_suite_count;
// this variable tracks the number of powerlosses triggered during the
// current test permutation, this is useful for both tests and debugging
extern size_t test_pls;
extern volatile size_t test_pls;
#define TEST_PLS test_pls