From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-377189-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 27724 invoked by alias); 16 Dec 2011 00:33:31 -0000
Received: (qmail 27715 invoked by uid 22791); 16 Dec 2011 00:33:30 -0000
X-SWARE-Spam-Status: No, hits=-2.8 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00,TW_TM
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 16 Dec 2011 00:33:17 +0000
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/49444] IV-OPTs changes an unaligned loads into aligned loads incorrectly
Date: Fri, 16 Dec 2011 00:36:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-49444-4-7eTiuwqdB5@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-49444-4@http.gcc.gnu.org/bugzilla/>
References: <bug-49444-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2011-12/txt/msg01755.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49444

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-12-16 00:33:10 UTC ---
This is the patch which I ended up with:
Index: tree-ssa-loop-ivopts.c
===================================================================
--- tree-ssa-loop-ivopts.c    (revision 61449)
+++ tree-ssa-loop-ivopts.c    (revision 61858)
@@ -6066,6 +6066,7 @@ rewrite_use_address (struct ivopts_data
   tree base_hint = NULL_TREE;
   tree ref, iv;
   bool ok;
+  tree type;

   adjust_iv_update_pos (cand, use);
   ok = get_computation_aff (data->current_loop, use, cand, use->stmt, &aff);
@@ -6087,7 +6088,13 @@ rewrite_use_address (struct ivopts_data
     base_hint = var_at_stmt (data->current_loop, cand, use->stmt);

   iv = var_at_stmt (data->current_loop, cand, use->stmt);
-  ref = create_mem_ref (&bsi, TREE_TYPE (*use->op_p), &aff,
+  type = TREE_TYPE (*use->op_p);
+  if (TREE_CODE (*use->op_p) == COMPONENT_REF)
+    {
+      unsigned align = DECL_ALIGN (TREE_OPERAND (*use->op_p, 1));
+      type = build_aligned_type (type, align);
+    }
+  ref = create_mem_ref (&bsi, type, &aff,
             reference_alias_ptr_type (*use->op_p),
             iv, base_hint, data->speed);
   copy_ref_info (ref, *use->op_p);
--- CUT ---
I also implemented on mips the misalignedmove patterns too.