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Guards: Improve performance of forall in guardDeterminesPhiInput. #21408

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Merged
aschackmull merged 2 commits into from
Mar 5, 2026
Merged

Guards: Improve performance of forall in guardDeterminesPhiInput. #21408

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ad5ab9f
Gaurds: Improve perf of forall in guardDeterminesPhiInput.
aschackmull Mar 4, 2026
37a8fc8
Guards: Use unique aggregate.
aschackmull Mar 5, 2026
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3 changes: 3 additions & 0 deletions shared/controlflow/codeql/controlflow/Guards.qll
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Expand Up @@ -641,6 +641,9 @@ module Make<
) {
exists(GuardValue dv, SsaExplicitWrite inp |
guardControlsPhiBranch(guard, v, phi, inp) and
// The `forall` below implies that there's only one such `inp` guarded by `guard == v`,
// but checking this upfront improves performance of the `forall` check.
1 = strictcount(SsaDefinition inp0 | guardControlsPhiBranch(guard, v, phi, inp0)) and
inp.getValue() = input and
dv = v.getDualValue() and
forall(SsaDefinition other | phi.hasInputFromBlock(other, _) and other != inp |
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