gcc/ChangeLog:

	PR tree-optimization/86204
	* tree-ssa-strlen.c (handle_builtin_strlen): Avoid storing
	a strnlen result if it's less than the length of the string.

gcc/testsuite/ChangeLog:

	PR tree-optimization/86204
	* gcc.dg/strlenopt-46.c: New test.

From-SVN: r262114