Re: [PATCH] RISC-V: Optimize codegen of VLA SLP

[Robin Dapp via Gcc-patches]

> +           /* Step 2: VID AND -NPATTERNS:
> +              { 0&-4, 1&-4, 2&-4, 3 &-4, 4 &-4, 5 &-4, 6 &-4, 7 &-4, ... }
> +           */
Before that, just add something simple like:

We want to create a pattern where value[ix] = floor (ix / NPATTERNS).
As NPATTERNS is always a power of two we can rewrite this as
= ix & -NPATTERNS.

Regards
 Robin