[PATCH][RFC] New function for checking misalignment

[Richard Guenther]

On Wed, Sep 2, 2009 at 4:32 PM, Revital1 Eres<ERES@il.ibm.com> wrote:
>
> Hello,
>
> This patch adds a new target hook for checking if unaligned access
> with a certain misalignment factor is supported by the target.
>
> Tested on powerpc64 and x86.
> OK for mainline? Comments are welcome.

The bool parameter to the targethook needs documenting.  In fact
it sounds redundant - the misalignment parameter should be enough
here, no?  And yes, the hook needs documenting in doc/tm.texi.

Thanks,
Richard.

> Thanks to Michael for providing initial feedback for the patch.
>
> Thanks,
> Revital
>
>        * targhooks.c (default_builtin_support_vector_misalignment):
>        New builtin function.
>        * targhooks.h (default_builtin_support_vector_misalignment):
>        Declare.
>        * target.h (builtin_support_vector_misalignment):
>        New field in struct gcc_target.
>        * tree-vect-data-refs.c (vect_supportable_dr_alignment): Call
>        new builtin function.
>        * target-def.h (TARGET_SUPPORT_VECTOR_MISALIGNMENT):
>        Define.
>        * config/rs6000/rs6000.c
>        (rs6000_builtin_support_vector_misalignment): New function.
>        (TARGET_SUPPORT_VECTOR_MISALIGNMENT): Define.
>
>
> (See attached file: misalign_2_9.txt)