https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110199
Bug ID: 110199 Summary: [12/13/14 Regression] Missing VRP transformation with MIN_EXPR and known relation Product: gcc Version: 14.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: pinskia at gcc dot gnu.org Target Milestone: --- Take: ``` int test(int a, int b) { if (a <= b) return a < b ? a : b; return 0; } ``` This used to be optimized in GCC 11 and before via EVRP: pushing new range for b_3(D): int [a_2(D), +INF] EQUIVALENCES: { b_3(D) } (1 elements) evrp visiting stmt _5 = MIN_EXPR <a_2(D), b_3(D)>; extract_range_from_stmt visiting: _5 = MIN_EXPR <a_2(D), b_3(D)>; Intersecting int VARYING and int VARYING to int VARYING Folding statement: _5 = MIN_EXPR <a_2(D), b_3(D)>; Folded into: _5 = a_2(D); But in GCC 12 and above it is missed: Folding statement: _5 = MIN_EXPR <a_2(D), b_3(D)>; folding with relation a_2(D) <= b_3(D) Not folded