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LibRegex: Merge alternations based on blocks and not instructions

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The instructions can have dependencies (e.g. Repeat), so only unify
equal blocks instead of consecutive instructions.
Fixes #11247.

Also adds the minimal test case(s) from that issue.
This commit is contained in:
Ali Mohammad Pur 2021-12-15 08:52:07 +03:30 • committed by Ali Mohammad Pur
parent 92233660b8
commit d2e51fafa9
3 changed files with 23 additions and 17 deletions
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4
Tests/LibRegex/Regex.cpp
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@ -899,7 +899,9 @@ TEST_CASE(optimizer_atomic_groups)
// Alternative fuse
Tuple { "(abcfoo|abcbar|abcbaz).*x"sv, "abcbarx"sv, true },
Tuple { "(a|a)"sv, "a"sv, true },
Tuple { "(a|)"sv, ""sv, true }, // Ensure that empty alternatives are not outright removed
Tuple { "(a|)"sv, ""sv, true }, // Ensure that empty alternatives are not outright removed
Tuple { "a{2,3}|a{5,8}"sv, "abc"sv, false }, // Optimiser should not mess up the instruction stream by ignoring inter-insn dependencies, see #11247.
Tuple { "^(a{2,3}|a{5,8})$"sv, "aaaa"sv, false }, // Optimiser should not mess up the instruction stream by ignoring inter-insn dependencies, see #11247.
// ForkReplace shouldn't be applied where it would change the semantics
Tuple { "(1+)\\1"sv, "11"sv, true },
Tuple { "(1+)1"sv, "11"sv, true },