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The following makes sure to have use predicates simplified and normalized before doing uninit_analysis::overlap because that otherwise cannot pick up all flag setting cases. This fixes half of the issue in PR67196 and conveniently resolves the XFAIL in gcc.dg/uninit-pred-7_a.c. PR tree-optimization/67196 * gimple-predicate-analysis.cc (uninit_analysis::is_use_guarded): Simplify and normalize use prediates before first use. * gcc.dg/uninit-pred-7_a.c: Un-XFAIL.
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