Re: [PATCH] Fold VEC_PERM_EXPR/VEC_INTERLEAVE*EXPR/VEC_EXTRACT*EXPR with VECTOR_CST/CONSTRUCTOR arguments (PR tree-optimization/51074, take 2)

[Richard Henderson]

On 11/11/2011 07:24 AM, Jakub Jelinek wrote:
>       PR tree-optimization/51074
>       * fold-const.c (vec_cst_ctor_to_array, fold_vec_perm): New functions.
>       (fold_binary_loc): Handle VEC_EXTRACT_EVEN_EXPR,
>       VEC_EXTRACT_ODD_EXPR, VEC_INTERLEAVE_HIGH_EXPR and
>       VEC_INTERLEAVE_LOW_EXPR with VECTOR_CST or CONSTRUCTOR operands.
>       (fold_ternary_loc): Handle VEC_PERM_EXPR with VECTOR_CST or
>       CONSTRUCTOR operands.
>       * tree-ssa-propagate.c (valid_gimple_rhs_p): Handle ternary
>       expressions.
>       * tree-vect-generic.c (lower_vec_perm): Mask sel_int elements
>       to 0 .. 2 * elements - 1.

Ok, except

> +    elts[i]
> +      = fold_convert (TREE_TYPE (TREE_TYPE (arg)), integer_zero_node);

build_int_cst.


r~