re PR tree-optimization/29902 (ICE in coalesce_abnormal_edges, at tree-outof-ssa.c:644)

	PR tree-optimization/29902
	* tree-ssa-loop-manip.c (can_unroll_loop_p): Return false if
	any involved ssa name appears in abnormal phi node.

	* g++.dg/tree-ssa/pr29902.C: New test.

From-SVN: r119074

gcc/ChangeLog

+2006-11-22  Zdenek Dvorak <dvorakz@suse.cz>
+
+	PR tree-optimization/29902
+	* tree-ssa-loop-manip.c (can_unroll_loop_p): Return false if
+	any involved ssa name appears in abnormal phi node.
+
 2006-11-21  Bob Wilson  <bob.wilson@acm.org>
 
 	* config/xtensa/xtensa.c (xtensa_char_to_class): Delete.

gcc/testsuite/ChangeLog

+2006-11-22  Zdenek Dvorak <dvorakz@suse.cz>
+
+	PR tree-optimization/29902
+	* g++.dg/tree-ssa/pr29902.C: New test.
+
 2006-11-21 Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/29820

gcc/testsuite/g++.dg/tree-ssa/pr29902.C

+/* { dg-do compile { target i?86-*-* } } */
+/* { dg-options "-O1 -fprefetch-loop-arrays -march=athlon" } */
+
+int length1();
+int g(int);
+void f(int capacity_, char *old_storage)
+{
+  try {
+      length1();
+      int old_capacity = capacity_;
+      capacity_ *= 2;
+      g(capacity_);
+      for (int i = 1; i < old_capacity; i++)
+	old_storage[i] = old_storage[i - 1];
+  } catch (...) {
+      for (int i = 1; i < capacity_; i++){old_storage[i] = 0;}
+  }
+}
+

gcc/tree-ssa-loop-manip.c

@@ -625,7 +625,16 @@ can_unroll_loop_p (struct loop *loop, unsigned factor,
     return false;
 
   if (!number_of_iterations_exit (loop, exit, niter, false)
-      || niter->cmp == ERROR_MARK)
+      || niter->cmp == ERROR_MARK
+      /* Scalar evolutions analysis might have copy propagated
+	 the abnormal ssa names into these expressions, hence
+	 emiting the computations based on them during loop
+	 unrolling might create overlapping life ranges for
+	 them, and failures in out-of-ssa.  */
+      || contains_abnormal_ssa_name_p (niter->may_be_zero)
+      || contains_abnormal_ssa_name_p (niter->control.base)
+      || contains_abnormal_ssa_name_p (niter->control.step)
+      || contains_abnormal_ssa_name_p (niter->bound))
     return false;
 
   /* And of course, we must be able to duplicate the loop.  */