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The `recompute_dominator' function used in the code fragment within this patch assumes correctness in the rest of the CFG. Consequently, it is wrong to rely upon it before the subsequent updates are made in the "Update dominators for multiple exits" loop in the function. Furthermore, if `loop_exit' == `scalar_exit', the "Update dominators for multiple exits" logic will already take care of updating the dominator for `scalar_exit->dest', such that the moved statement is unnecessary. gcc/ChangeLog: PR tree-optimization/123152 * tree-vect-loop-manip.cc (slpeel_tree_duplicate_loop_to_edge_cfg): Correct order of dominator update. gcc/testsuite/ChangeLog: * gcc.dg/vect/vect-uncounted-prolog-peel_2.c: New. * gcc.dg/vect/vect-uncounted-prolog-peel_3.c: Likewise. * g++.dg/vect/vect-uncounted-prolog-peel_1.cc: Likewise.
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