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The following fixes how during reduction epilogue generation we gather conditional compares for condition reductions, thereby following the reduction chain via STMT_VINFO_REDUC_IDX. The issue is that SLP nodes for COND_EXPRs can have either three or four children dependent on whether we have legacy GENERIC expressions in the transitional pattern GIMPLE for the COND_EXPR condition. PR tree-optimization/115959 * tree-vect-loop.cc (vect_create_epilog_for_reduction): Get at the REDUC_IDX child in a safer way for COND_EXPR nodes. * gcc.dg/vect/pr115959.c: New testcase.
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