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

[Richard Henderson]

On 11/10/2011 12:00 PM, Richard Henderson wrote:
> VEC_PERM_EXPR is explicitly modulo.  Don't fail, mask.

It does occur to me that we could usefully fold a constant selector with 
out-of-range elements to a new selector with in-range elements, even if the 
other operands are non-constant.  This might result in more masks being shared, 
should they get spilled to memory.


r~