cse.c (find_comparison_args): Check for cycles of any length.

cse.c (find_comparison_args): Check for cycles of any length.

2012-07-26  Andrew Jenner  <andrew@codesourcery.com>
	    Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* cse.c (find_comparison_args): Check for cycles of any length.

	gcc/testsuite/
	* gcc.c-torture/compile/pr50380.c: Add code to cause cycle of length 2.

Co-Authored-By: Sandra Loosemore <sandra@codesourcery.com>
From-SVN: r189896