Re: [PATCH] disable ldist for test, to restore vectorizing-candidate loop

["Kewen.Lin" <linkw@linux.ibm.com>]

on 2024/4/22 17:27, Alexandre Oliva wrote:
> Ping?
> https://gcc.gnu.org/pipermail/gcc-patches/2021-March/566524.html
> 
> The loop we're supposed to try to vectorize in
> gcc.dg/vect/costmodel/ppc/costmodel-vect-31a.c is turned into a memset
> before the vectorizer runs.
> 
> Various other tests in this set have already run into this, and the
> solution has been to disable this loop distribution transformation,
> enabled at -O2, so that the vectorizer gets a chance to transform the
> loop and, in this testcase, fail to do so.
> 
> Regstrapped on x86_64-linux-gnu and ppc64el-linux-gnu.  Also tested with
> gcc-13 on ppc64-vx7r2 and ppc-vx7r2.  Ok to install?

OK, thanks!

BR,
Kewen

> 
> 
> for  gcc/testsuite/ChangeLog
> 
> 	* gcc.dg/vect/costmodel/ppc/costmodel-vect-31a.c: Disable
> 	ldist.
> ---
>  .../gcc.dg/vect/costmodel/ppc/costmodel-vect-31a.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-vect-31a.c b/gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-vect-31a.c
> index 454a714a30916..90b5d5a7f400b 100644
> --- a/gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-vect-31a.c
> +++ b/gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-vect-31a.c
> @@ -1,4 +1,5 @@
>  /* { dg-require-effective-target vect_int } */
> +/* { dg-additional-options "-fno-tree-loop-distribute-patterns" } */
> 
>  #include <stdarg.h>
>  #include "../../tree-vect.h"
>