r239421 - in /trunk/gcc: ChangeLog match.pd tes...

[ppalka@gcc.gnu.org]

Author: ppalka
Date: Fri Aug 12 16:07:40 2016
New Revision: 239421

URL: https://gcc.gnu.org/viewcvs?rev=239421&root=gcc&view=rev
Log:
Fix PR middle-end/71654 (missed shortening of a compare)

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.


Added:
    trunk/gcc/testsuite/c-c++-common/pr71654.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/vrp23.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/vrp24.c