[PATCH] Fix vectorizer bool pattern matching with -fnon-call-exceptions (PR tree-optimization/52046)

[Jakub Jelinek]

Hi!

If a comparison can throw, it won't be a valid condition for
COND_EXPR or VEC_COND_EXPR, because is_gimple_condexpr will
fail.  This patch gives up in that case.  Bootstrapped/regtested on
x86_64-linux and i686-linux, ok for trunk?

2012-01-30  Jakub Jelinek  <ja...@redhat.com>

        PR tree-optimization/52046
        * tree-vect-patterns.c (check_bool_pattern): Give up if
        a comparison could throw.

        * gcc.dg/pr52046.c: New test.

--- gcc/tree-vect-patterns.c.jj 2012-01-13 21:47:35.000000000 +0100
+++ gcc/tree-vect-patterns.c    2012-01-30 10:58:11.048787682 +0100
@@ -1,5 +1,5 @@
 /* Analysis Utilities for Loop Vectorization.
-   Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011
+   Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012
    Free Software Foundation, Inc.
    Contributed by Dorit Nuzman <do...@il.ibm.com>
 
@@ -1967,6 +1967,11 @@ check_bool_pattern (tree var, loop_vec_i
        {
          tree vecitype, comp_vectype;
 
+         /* If the comparison can throw, then is_gimple_condexpr will be
+            false and we can't make a COND_EXPR/VEC_COND_EXPR out of it.  */
+         if (stmt_could_throw_p (def_stmt))
+           return false;
+
          comp_vectype = get_vectype_for_scalar_type (TREE_TYPE (rhs1));
          if (comp_vectype == NULL_TREE)
            return false;
--- gcc/testsuite/gcc.dg/pr52046.c.jj   2012-01-30 10:59:42.749264286 +0100
+++ gcc/testsuite/gcc.dg/pr52046.c      2012-01-30 10:59:28.000000000 +0100
@@ -0,0 +1,14 @@
+/* PR tree-optimization/52046 */
+/* { dg-do compile } */
+/* { dg-options "-O3 -fexceptions -fnon-call-exceptions" } */
+
+extern float a[], b[], c[], d[];
+extern int k[];
+
+void
+foo (void)
+{
+  int i;
+  for (i = 0; i < 1024; ++i)
+    k[i] = (a[i] < b[i]) | (c[i] < d[i]);
+}

        Jakub