gcc/ChangeLog:

	PR middle-end/71654
	* match.pd ((T)A CMP (T)B -> A CMP B): Allow (T)A to be a
	sign-changing cast from a shorter unsigned type to a wider
	signed type.

gcc/testsuite/ChangeLog:

	PR middle-end/71654
	* gcc.dg/c-c++-common/pr71654.c: New test.
	* gcc.dg/tree-ssa/vrp23: Add -fno-tree-forwprop to
	dg-options.
	* gcc.dg/tree-ssa/vrp24: Likewise.

From-SVN: r239421