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From: "hubicka at ucw dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/59660] We fail to optimize common boolean checks pre-inlining
Date: Tue, 07 Jan 2014 15:07:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59660

--- Comment #4 from Jan Hubicka <hubicka at ucw dot cz> ---
> Not all testcases can be handled at gimplification time IIRC.  Which
> means "testcases welcome" first, so we can look at them individually.

The GCC one I saw was equivalent of:
#include <stdbool.h>
bool
m_is_less_than_n (int n, int m)
{
   return (n==m || m_is_less_than_n (n-1,m));
}