PR tree-optimization/78725
	* tree-ssa-loop-split.c (split_at_bb_p): Check for overflow and
	at correct use point.

testsuite/
	PR tree-optimization/78725
	* gcc.dg/pr78725.c: New test.
	* gcc.dg/pr78725-2.c: New test.

From-SVN: r243606