r220743 - in /trunk/gcc: ChangeLog testsuite/Ch...

[law@gcc.gnu.org]

Author: law
Date: Mon Feb 16 20:56:55 2015
New Revision: 220743

URL: https://gcc.gnu.org/viewcvs?rev=220743&root=gcc&view=rev
Log:
	PR tree-optimization/64823
	* tree-vrp.c (identify_jump_threads): Handle blocks with no real
	statements.
	* tree-ssa-threadedge.c (potentially_threadable_block): Allow
	threading through blocks with PHIs, but no statements.
	(thread_through_normal_block): Distinguish between blocks where
	we did not process all the statements and blocks with no statements.

	PR tree-optimization/64823
	* gcc.dg/uninit-20.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/uninit-20.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-threadedge.c
    trunk/gcc/tree-vrp.c