[PATCH] Fix PR53050

[Richard Guenther]

This fixes PR53050.

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.

Richard.

2012-04-20  Richard Guenther  <rguent...@suse.de>

        PR tree-optimization/53050
        * tree-ssa-forwprop.c (ssa_forward_propagate_and_combine):
        Do only one transform on COND_EXPRs at the same time.

Index: gcc/tree-ssa-forwprop.c
===================================================================
--- gcc/tree-ssa-forwprop.c     (revision 186611)
+++ gcc/tree-ssa-forwprop.c     (working copy)
@@ -2536,9 +2536,12 @@ ssa_forward_propagate_and_combine (void)
                         || code == VEC_COND_EXPR)
                  {
                    /* In this case the entire COND_EXPR is in rhs1. */
-                   changed |= forward_propagate_into_cond (&gsi);
-                   changed |= combine_cond_exprs (&gsi);
-                   stmt = gsi_stmt (gsi);
+                   if (forward_propagate_into_cond (&gsi)
+                       || combine_cond_exprs (&gsi))
+                     {
+                       changed = true;
+                       stmt = gsi_stmt (gsi);
+                     }
                  }
                else if (TREE_CODE_CLASS (code) == tcc_comparison)
                  {