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[autovect] unknown alignment and loop peeling

From: Devang Patel <dpatel at apple dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Dorit Naishlos <DORIT at il dot ibm dot com>
Date: Tue, 21 Feb 2006 13:58:49 -0800
Subject: [autovect] unknown alignment and loop peeling

Hello,

This patch adds target to handle unknown alignment. It does not add runtime test yet. Many vectorizer tests fail for platforms that do not define this new target hook. These tests rely on unknown, but safe for peeling, alignment. This patch includes target hook for powerpc-apple-darwin.


        * targhooks.h (vector_alignment_reachable): New.
        * target.h (gcc_target): Add vector_alignment_reachable.
        * target-def.h (TARGET_VECTOR_ALIGNMENT_REACHABLE): New.
        * tree-vect-analyze.c (vect_enhance_data_refs_alignment): Avoid
        peeling when natural alignment is not reachable due to known
        misalignment. Use target hook to check unknown alignment.
        * config/rs6000.c (TARGET_VECTOR_ALIGNMENT_REACHABLE,
        rs6000_vector_alignment_reachable): New.

        * gcc.dg/vect/vect-align-1.c: New.
        * gcc.dg/vect/vect-align-2.c: New.

thoughts?
-
Devang

Attachment: av_unknown_align_peel.diff
Description: Binary data

Follow-Ups:
- Re: [autovect] unknown alignment and loop peeling
  - From: Dorit Nuzman

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