Generate correctly typed compare in canonicalize_loop_ivs

2018-06-20  Tom de Vries  <tdevries@suse.de>

	PR tree-optimization/86097
	* tree-ssa-loop-manip.c (canonicalize_loop_ivs): Also convert *nit to
	iv type if signedness of iv type is not the same as that of *nit.

	* gcc.dg/autopar/pr86097.c: New test.

From-SVN: r261804

gcc/ChangeLog

+2018-06-20  Tom de Vries  <tdevries@suse.de>
+
+	PR tree-optimization/86097
+	* tree-ssa-loop-manip.c (canonicalize_loop_ivs): Also convert *nit to
+	iv type if signedness of iv type is not the same as that of *nit.
+
 2018-06-20  Jakub Jelinek  <jakub@redhat.com>
 
 	* cfgrtl.c (rtl_verify_edges): Formatting fix.  If bb->preds has any

gcc/testsuite/ChangeLog

+2018-06-20  Tom de Vries  <tdevries@suse.de>
+
+	PR tree-optimization/86097
+	* gcc.dg/autopar/pr86097.c: New test.
+
 2018-06-20  Nathan Sidwell  <nathan@acm.org>
 
 	PR c++/85634

gcc/testsuite/gcc.dg/autopar/pr86097.c

+/* { dg-options "-O2 -ftree-parallelize-loops=2 -fno-tree-dce -Wno-aggressive-loop-optimizations" } */
+int rp, vd;
+
+void
+p5 (int cd)
+{
+  while (cd != 0)
+    {
+      for (rp = 0; rp < 4; ++rp)
+        for (vd = 0; vd < 1; ++vd)
+          {
+ g0:
+            ;
+          }
+
+      ++rp;
+    }
+
+  while (rp < 2)
+    {
+      for (cd = 0; cd < 1; ++cd)
+        for (rp = 1; rp != 0; ++rp)
+          {
+          }
+
+      ++rp;
+    }
+
+  if (cd != 0)
+    goto g0;
+}

gcc/tree-ssa-loop-manip.c

@@ -1542,7 +1542,8 @@ canonicalize_loop_ivs (struct loop *loop, tree *nit, bool bump_in_latch)
   precision = GET_MODE_PRECISION (mode);
   type = build_nonstandard_integer_type (precision, unsigned_p);
 
-  if (original_precision != precision)
+  if (original_precision != precision
+      || TYPE_UNSIGNED (TREE_TYPE (*nit)) != unsigned_p)
     {
       *nit = fold_convert (type, *nit);
       *nit = force_gimple_operand (*nit, &stmts, true, NULL_TREE);