1 files changed, 27 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/opt/unroll2.C b/gcc/testsuite/g++.dg/opt/unroll2.C
new file mode 100644
index 000000000..82a1e7f56
--- /dev/null
+++ b/gcc/testsuite/g++.dg/opt/unroll2.C
@@ -0,0 +1,27 @@
+// PR tree-opt/28937
+// Complete unroll forgot to update the statement usage
+// which meant we ICEd in add_virtual_operand.
+
+// { dg-do compile }
+// { dg-options "-O2" }
+
+
+class SHA256
+{
+  unsigned m_digest;
+  unsigned long long m_count;
+  unsigned char _buffer[64];
+  static void Transform (unsigned * data);
+  void WriteByteBlock (unsigned t);
+};
+void SHA256::WriteByteBlock (unsigned t)
+{
+  unsigned data32[16];
+  Transform (data32);
+  unsigned long long lenInBits = m_count;
+  if (t != (64 - 8))
+    return;
+  for (int i = 0; i < 2; i++)
+          _buffer[t++] = (unsigned char)lenInBits;
+}
+