gcc/testsuite/ChangeLog:

	PR tree-optimization/91294
	* gcc.dg/strlenopt-44.c: Adjust tested result.
	* gcc.dg/strlenopt-70.c: Avoid exercising unimplemnted optimization.
	* gcc.dg/strlenopt-73.c: New test.
	* gcc.dg/strlenopt-74.c: New test.
	* gcc.dg/strlenopt-75.c: New test.
	* gcc.dg/strlenopt-76.c: New test.
	* gcc.dg/strlenopt-77.c: New test.

gcc/ChangeLog:

	PR tree-optimization/91294
	* tree-ssa-strlen.c (handle_store): Avoid treating lower bound of
	source length as exact.

From-SVN: r274486