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Add widening add, subtract patterns to tree-vect-patterns. Update the widened code of patterns that detect PLUS_EXPR to also detect WIDEN_PLUS_EXPR. These patterns take 2 vectors with N elements of size S and perform an add/subtract on the elements, storing the results as N elements of size 2*S (in 2 result vectors). This is implemented in the aarch64 backend as addl,addl2 and subl,subl2 respectively. Add aarch64 tests for patterns. gcc/ChangeLog: * doc/generic.texi: Document new widen_plus/minus_lo/hi tree codes. * doc/md.texi: Document new widenening add/subtract hi/lo optabs. * expr.c (expand_expr_real_2): Add widen_add, widen_subtract cases. * optabs-tree.c (optab_for_tree_code): Add case for widening optabs. * optabs.def (OPTAB_D): Define vectorized widen add, subtracts. * tree-cfg.c (verify_gimple_assign_binary): Add case for widening adds, subtracts. * tree-inline.c (estimate_operator_cost): Add case for widening adds, subtracts. * tree-vect-generic.c (expand_vector_operations_1): Add case for widening adds, subtracts * tree-vect-patterns.c (vect_recog_widen_add_pattern): New recog pattern. (vect_recog_widen_sub_pattern): New recog pattern. (vect_recog_average_pattern): Update widened add code. (vect_recog_average_pattern): Update widened add code. * tree-vect-stmts.c (vectorizable_conversion): Add case for widened add, subtract. (supportable_widening_operation): Add case for widened add, subtract. * tree.def (WIDEN_PLUS_EXPR): New tree code. (WIDEN_MINUS_EXPR): New tree code. (VEC_WIDEN_ADD_HI_EXPR): New tree code. (VEC_WIDEN_PLUS_LO_EXPR): New tree code. (VEC_WIDEN_MINUS_HI_EXPR): New tree code. (VEC_WIDEN_MINUS_LO_EXPR): New tree code. gcc/testsuite/ChangeLog: * gcc.target/aarch64/vect-widen-add.c: New test. * gcc.target/aarch64/vect-widen-sub.c: New test.
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