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b073f2b098
With -ffast-math we end up associating reduction chains and break them - this is because of old code that tries to rectify reductions into a shape likened by the vectorizer. Nowadays the rank compute produces correct association for reduction chains and the vectorizer has robust support to fall back to a regular reductions (via reduction path) when it turns out to be not a proper reduction chain. So this patch removes the special code in reassoc which makes the TSVC s352 vectorized with -Ofast (it is already without -ffast-math). PR tree-optimization/99412 * tree-ssa-reassoc.cc (is_phi_for_stmt): Remove. (swap_ops_for_binary_stmt): Remove reduction handling. (rewrite_expr_tree_parallel): Adjust. (reassociate_bb): Likewise. * tree-parloops.cc (build_new_reduction): Handle MINUS_EXPR. * gcc.dg/vect/pr99412.c: New testcase. * gcc.dg/tree-ssa/reassoc-47.c: Adjust comment. * gcc.dg/tree-ssa/reassoc-48.c: Remove. |
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