fur_list should not use the range vector for non-ssa operands.

	gcc/
	PR tree-optimization/110582
	* gimple-range-fold.cc (fur_list::get_operand): Do not use the
	range vector for non-ssa names.

	gcc/testsuite/
	* gcc.dg/pr110582.c: New.

diff --git a/gcc/gimple-range-fold.cc b/gcc/gimple-range-fold.cc
index d07246008f0f9ea39cf739367e4ac3ef80e7f801..ab2d996c4ebfb38acd1f00075cfcd151df75841e 100644 (file)
--- a/gcc/gimple-range-fold.cc
+++ b/gcc/gimple-range-fold.cc
@@ -262,7 +262,8 @@ fur_list::fur_list (unsigned num, vrange **list, range_query *q)
 bool
 fur_list::get_operand (vrange &r, tree expr)
 {
-  if (m_index >= m_limit)
+  // Do not use the vector for non-ssa-names, or if it has been emptied.
+  if (TREE_CODE (expr) != SSA_NAME || m_index >= m_limit)
     return m_query->range_of_expr (r, expr);
   r = *m_list[m_index++];
   gcc_checking_assert (range_compatible_p (TREE_TYPE (expr), r.type ()));

diff --git a/gcc/testsuite/gcc.dg/pr110582.c b/gcc/testsuite/gcc.dg/pr110582.c
new file mode 100644 (file)
index 0000000..ae0650d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr110582.c
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-vrp2" } */
+
+int a, b;
+int main() {
+  char c = a = 0;
+  for (; c != -3; c++) {
+    int d = 2;
+    d ^= 2 && a;
+    b = a == 0 ? d : d / a;
+    a = b;
+  }
+  for (; (1 + 95 << 24) + b + 1 + 686658714L + b - 2297271457;)
+    ;
+}
+
+/* { dg-final { scan-tree-dump-not "Folding predicate" "vrp2" } } */
+