PR tree-optimization/81913
	* tree-ssa-loop-niter.c (number_of_iterations_cond): Skip niter
	analysis when either IVs in condition can wrap.

	gcc/testsuite
	* gcc.c-torture/execute/pr81913.c: New test.
	* gcc.dg/tree-ssa/loop-niter-1.c: New test.
	* gcc.dg/tree-ssa/loop-niter-2.c: New test.

From-SVN: r251337