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There are some single PHI groups that can benefit from an initial value. Also improve the iteration calculation by bounding each iteration with the known global value. PR tree-optimization/121345 gcc/ * gimple-range-phi.cc (phi_group::phi_group): Add modifier name. (phi_group::is_modifier_p): Set modifier stmt operand name. (phi_group::calculate_using_modifier): Bound the iteration range by known global range. (phi_analyzer::process_phi): Allow single PHIS if they meet certain criteria. * gimple-range-phi.h (m_modifier_name): New member. (is_modifier_p): Adjust prototype. gcc/testsuite/ * g++.dg/pr121345.C: New.
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