[PATCH] New function for checking misalignment

[Revital1 Eres]

Hello,

Following the RFC message:
http://gcc.gnu.org/ml/gcc-patches/2009-09/msg00129.html;
attached is the patch for adding a new target hook function
for checking misalignment.
The patch was tested on Power7 and x86.

OK for mainline?

Thanks,
Revital

        * doc/tm.texi (TARGET_SUPPORT_VECTOR_MISALIGNMENT): Document.
        * 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_15_9.txt)
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