[PATCH] ipa: do not make localaliases for target_clones [PR101261]

Jan Hubicka hubicka@ucw.cz
Fri Aug 13 10:23:02 GMT 2021


> Hello.
> 
> Right now, target_clone pass complains when a target_clone function is an alias.
> That happens when localalias is created by callgraph. I think we should not create
> such aliases as we won't benefit much from it in case of target_clones.
> 
> Patch can bootstrap on x86_64-linux-gnu and survives regression tests.
> 
> Ready to be installed?
OK, thanks
Honza
> Thanks,
> Martin
> 
> 	PR ipa/101261
> 
> gcc/ChangeLog:
> 
> 	* symtab.c (symtab_node::noninterposable_alias): Do not create
> 	  local aliases for target_clone functions as the clonning pass
> 	  rejects aliases.
> 
> gcc/testsuite/ChangeLog:
> 
> 	* gcc.target/i386/pr101261.c: New test.
> ---
>  gcc/symtab.c                             |  2 ++
>  gcc/testsuite/gcc.target/i386/pr101261.c | 11 +++++++++++
>  2 files changed, 13 insertions(+)
>  create mode 100644 gcc/testsuite/gcc.target/i386/pr101261.c
> 
> diff --git a/gcc/symtab.c b/gcc/symtab.c
> index 8c4cb70b015..c7ea8ecef74 100644
> --- a/gcc/symtab.c
> +++ b/gcc/symtab.c
> @@ -1959,6 +1959,8 @@ symtab_node::noninterposable_alias (void)
>    /* If aliases aren't supported by the assembler, fail.  */
>    if (!TARGET_SUPPORTS_ALIASES)
>      return NULL;
> +  else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (node->decl)))
> +    return NULL;
>    /* Otherwise create a new one.  */
>    new_decl = copy_node (node->decl);
> diff --git a/gcc/testsuite/gcc.target/i386/pr101261.c b/gcc/testsuite/gcc.target/i386/pr101261.c
> new file mode 100644
> index 00000000000..d25d1a202c2
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/i386/pr101261.c
> @@ -0,0 +1,11 @@
> +/* PR middle-end/101261 */
> +/* { dg-do compile { target fpic } } */
> +/* { dg-options "-fno-semantic-interposition -fPIC" } */
> +/* { dg-require-ifunc "" } */
> +
> +void
> +__attribute__((target_clones("default", "avx2")))
> +dt_ioppr_transform_image_colorspace()
> +{
> +  dt_ioppr_transform_image_colorspace();
> +}
> -- 
> 2.32.0
> 


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