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[PATCH] misalignment and loop peeling (vectorizer)

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, 31 Jan 2006 13:46:50 -0800
Subject: [PATCH] misalignment and loop peeling (vectorizer)

As discussed earlier, peeling loop iterations does not guarantee to reach natural alignment. In such cases, loop peeling should be avoided (or runtime test is required). This patch handles the case where misalignment is known. Bootstrapped and tested on powerpc- darwin. I am also including patch for autovect-branch here. This patch does not handle the case where alignment is unknown.

        * tree-vect-analyze.c (vect_enhance_data_refs_alignment): Avoid
        peeling when natural alignment is not reachable due to known
        misalignment.

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

OK for mainline ?

Thanks,
-
Devang

Attachment: av_misalign_peel.diff
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Attachment: av_mialign_peel-autovect-branch.diff
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