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Re: RFA: patch to avoid multiple zero vectors (Was: Re: zero vector usage)

> + /* Generate a vector like gen_rtx_CONST_VEC, but use the zero vector when
> +    all elements are zero.  */
> + rtx
> + gen_const_vector (mode, v)
> +      enum machine_mode mode;
> +      rtvec v;
> + {
> +   rtx inner_zero = CONST0_RTX (GET_MODE_INNER (mode));
> +   int i;
> + 
> +   for (i = GET_MODE_NUNITS (mode) - 1; i >= 0; i--)
> +     if (RTVEC_ELT (v, i) != inner_zero)
> +       return gen_rtx_CONST_VECTOR (mode, v);
> +   return CONST0_RTX (mode);
> + }
> + 

sweet!  this looks good.  thanks.

...of course you have to wait for approval.

aldy
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