[PATCH] Don't warn with -Waggressive-loop-optimizations multiple times about the same loop (PR middle-end/59561)

[Jakub Jelinek]

Hi!

When a loop is duplicated, inlined etc. and we've already warned
about undefined behavior in it, it is undesirable to warn again.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2014-01-22  Jakub Jelinek  <ja...@redhat.com>

        PR middle-end/59561
        * cfgloopmanip.c (copy_loop_info): If
        loop->warned_aggressive_loop_optimizations, make sure
        the flag is set in target loop too.

--- gcc/cfgloopmanip.c.jj       2014-01-03 11:40:33.000000000 +0100
+++ gcc/cfgloopmanip.c  2014-01-22 10:21:54.057871045 +0100
@@ -1022,6 +1022,8 @@ copy_loop_info (struct loop *loop, struc
   target->any_estimate = loop->any_estimate;
   target->nb_iterations_estimate = loop->nb_iterations_estimate;
   target->estimate_state = loop->estimate_state;
+  target->warned_aggressive_loop_optimizations
+    |= loop->warned_aggressive_loop_optimizations;
 }
 
 /* Copies copy of LOOP as subloop of TARGET loop, placing newly

        Jakub