Fix for PR39548

From-SVN: r145118

Fix for PR39548
From-SVN: r145118
4577cea1 · Xinliang David Li · Xinliang David Li · 0f7464f4 · 4577cea1 · 4577cea1
Commit 4577cea1 authored Mar 27, 2009 by Xinliang David Li Committed by Xinliang David Li Mar 27, 2009
Expand all Hide whitespace changes
Inline Side-by-side

Showing with 13 additions and 1 deletions

gcc/ChangeLog
+6 -0

gcc/testsuite/ChangeLog
+5 -0

gcc/testsuite/g++.dg/tree-ssa/copyprop.C
+0 -0

gcc/tree-ssa-copy.c
+2 -1

No files found.
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+2009-03-27  Xinliang David Li  <davidxl@google.com>
+
+	PR tree-optimization/39548
+	* tree-ssa-copy.c (copy_prop_visit_phi_node): Add copy 
+	candidate check.
+
 2009-03-27  H.J. Lu  <hongjiu.lu@intel.com>

 	* c-common.c (pointer_int_sum): Use %wd on return from

--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
+2009-03-27  Xinliang David Li  <davidxl@google.com>
+
+	PR tree-optimization/39548
+	* g++.dg/tree-ssa/copyprop.C: New test.
+
 2009-03-27  Andrew Pinski  <andrew_pinski@playstation.sony.com>

 	PR c++/38638

--- a/gcc/testsuite/g++.dg/tree-ssa/copyprop.C
+++ b/gcc/testsuite/g++.dg/tree-ssa/copyprop.C
--- a/gcc/tree-ssa-copy.c
+++ b/gcc/tree-ssa-copy.c
@@ -908,7 +908,8 @@ copy_prop_visit_phi_node (gimple phi)
 	}
    }

-  if (phi_val.value && set_copy_of_val (lhs, phi_val.value))
+  if (phi_val.value &&  may_propagate_copy (lhs, phi_val.value)
+      && set_copy_of_val (lhs, phi_val.value))
    retval = (phi_val.value != lhs) ? SSA_PROP_INTERESTING : SSA_PROP_VARYING;
  else
    retval = SSA_PROP_NOT_INTERESTING;