PR tree-optimization/77664
	* tree-ssa-reassoc.c (update_range_test): Also clear low and high
	for the other ranges.
	(optimize_range_tests_diff): Fix up formatting.
	(optimize_range_tests_var_bound): New function.
	(optimize_range_tests): Use it.

	* gcc.dg/tree-ssa/pr77664.c: New test.
	* gcc.dg/pr77664.c: New test.

From-SVN: r240858