From patchwork Tue Nov 27 13:23:03 2012
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Subject: Remove bogus assertion from the vectorizer (PR
 tree-optimization/55110)
Date: Tue, 27 Nov 2012 03:23:03 -0000
From: Jakub Jelinek <jakub@redhat.com>
X-Patchwork-Id: 202213
Message-Id: <20121127132303.GY2315@tucnak.redhat.com>
To: gcc-patches@gcc.gnu.org

Hi!

This patch removes a bogus assertion (that predates introduction
of STMT_VINFO_PATTERN_DEF_SEQ (and STMT_VINFO_PATTERN_DEF_STMT
before that) in 4.7).  stmt might be not just STMT_VINFO_RELATED_STMT
of orig_stmt, bt also could be anywhere in STMT_VINFO_PATTERN_DEF_SEQ
of it.  We don't vectorize this anyway for multiple reasons (e.g.
orig_code is TRUNC_DIV_EXPR which isn't handled reduction code,
and even the pattern recognized stmts include MULT_HIGHPART_EXPR
which isn't handled either).

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2012-11-27  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/55110
	* tree-vect-loop.c (vectorizable_reduction): Don't assert
	that STMT_VINFO_RELATED_STMT of orig_stmt is stmt.

	* gcc.dg/pr55110.c: New test.


	Jakub


--- gcc/tree-vect-loop.c.jj	2012-11-21 16:00:12.000000000 +0100
+++ gcc/tree-vect-loop.c	2012-11-26 11:24:42.903995009 +0100
@@ -4624,7 +4624,6 @@ vectorizable_reduction (gimple stmt, gim
   if (orig_stmt)
     {
       orig_stmt_info = vinfo_for_stmt (orig_stmt);
-      gcc_assert (STMT_VINFO_RELATED_STMT (orig_stmt_info) == stmt);
       gcc_assert (STMT_VINFO_IN_PATTERN_P (orig_stmt_info));
       gcc_assert (!STMT_VINFO_IN_PATTERN_P (stmt_info));
     }
--- gcc/testsuite/gcc.dg/pr55110.c.jj	2012-11-26 11:31:32.008587313 +0100
+++ gcc/testsuite/gcc.dg/pr55110.c	2012-11-26 11:31:09.000000000 +0100
@@ -0,0 +1,13 @@
+/* PR tree-optimization/55110 */
+/* { dg-do compile } */
+/* { dg-options "-O1 -ftree-vectorize" } */
+
+int
+foo (int x)
+{
+  int a, b;
+  for (b = 0; b < 8; b++)
+    for (a = 0; a < 2; a++)
+      x /= 3;
+  return x;
+}