Hi! Uros has reported my optimize_vector_constructor optimization causes problems on Alpha which for some vector modes supports only moves, but not arithmetics. The following patch fixed that in a cross compiler, and has been bootstrapped/regtested on x86_64-linux and i686-linux.
Ok for trunk? 2013-11-26 Jakub Jelinek <ja...@redhat.com> PR middle-end/59273 * tree-vect-generic.c (optimize_vector_constructor): Don't optimize if there isn't optab handler for the corresponding vector PLUS_EXPR. --- gcc/tree-vect-generic.c.jj 2013-11-22 21:03:16.000000000 +0100 +++ gcc/tree-vect-generic.c 2013-11-26 08:53:11.117052615 +0100 @@ -1015,9 +1015,14 @@ optimize_vector_constructor (gimple_stmt tree *cst; gimple g; tree base = NULL_TREE; + optab op; if (nelts <= 2 || CONSTRUCTOR_NELTS (rhs) != nelts) return; + op = optab_for_tree_code (PLUS_EXPR, type, optab_default); + if (op == unknown_optab + || optab_handler (op, TYPE_MODE (type)) == CODE_FOR_nothing) + return; FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (rhs), i, elt) if (TREE_CODE (elt->value) != SSA_NAME || TREE_CODE (TREE_TYPE (elt->value)) == VECTOR_TYPE) Jakub