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f99d7d669e
When the CFG has not merged equal PHI defs in a switch stmt the cost model from switch conversion gets off and we prefer a jump table over branches. The following fixes that by recording cases that will be merged later and more appropriately counting unique values. PR tree-optimization/107767 * tree-cfgcleanup.cc (phi_alternatives_equal): Export. * tree-cfgcleanup.h (phi_alternatives_equal): Declare. * tree-switch-conversion.cc (switch_conversion::collect): Count unique non-default targets accounting for later merging opportunities. * gcc.dg/tree-ssa/pr107767.c: New testcase.
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