* loop.c (insert_bct): Ensure loop_iteration_var non-zero before use.

[gcc.git] / gcc / loop.c

diff --git a/gcc/loop.c b/gcc/loop.c
index dc4eaa9466dd057a2472420eb0b5ef011c20722e..556877feff9dfb5351a3f29219a03f97e2afb8d4 100644 (file)
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -8054,12 +8054,21 @@ insert_bct (loop_start, loop_end)
      at compile time.  In this case we generate run_time calculation
      of the number of iterations.  */
 
+  if (loop_iteration_var == 0)
+    {
+      if (loop_dump_stream)
+       fprintf (loop_dump_stream,
+                "insert_bct %d: BCT Runtime Instrumentation failed: no loop iteration variable found\n",
+                loop_num);
+      return;
+    }
+
   if (GET_MODE_CLASS (GET_MODE (loop_iteration_var)) != MODE_INT
       || GET_MODE_SIZE (GET_MODE (loop_iteration_var)) != UNITS_PER_WORD)
     {
       if (loop_dump_stream)
        fprintf (loop_dump_stream,
-                "insert_bct %d: BCT Instrumentation failed: loop variable not integer\n",
+                "insert_bct %d: BCT Runtime Instrumentation failed: loop variable not integer\n",
                 loop_num);
       return;
     }
@@ -8069,7 +8078,7 @@ insert_bct (loop_start, loop_end)
     {
       if (loop_dump_stream)
        fprintf (loop_dump_stream,
-                "insert_bct %d: runtime bounds with != comparison\n",
+                "insert_bct %d: BCT Runtime Instrumentation failed: runtime bounds with != comparison\n",
                 loop_num);
       return;
     }