On Wed, 30 Aug 2023, Jakub Jelinek wrote:
> On Wed, Aug 30, 2023 at 01:54:46PM +0200, Richard Biener via Gcc-patches
> wrote:
> > * gcc.dg/tree-ssa/forwprop-42.c: New testcase.
>
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.dg/tree-ssa/forwprop-42.c
> > @@ -0,0 +1,17 @@
> > +/* { dg-do comp
On Wed, Aug 30, 2023 at 01:54:46PM +0200, Richard Biener via Gcc-patches wrote:
> * gcc.dg/tree-ssa/forwprop-42.c: New testcase.
> --- /dev/null
> +++ b/gcc/testsuite/gcc.dg/tree-ssa/forwprop-42.c
> @@ -0,0 +1,17 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O -fdump-tree-cddce1" } */
>
The following adds simplification of two VEC_PERM_EXPRs where
the later one replaces all elements from either the first or the
second input of the earlier permute. This allows a three input
permute to be simplified to a two input one.
I'm following the existing two input simplification case and o
