re PR tree-optimization/61839 (More optimize opportunity for VRP)

re PR tree-optimization/61839 (More optimize opportunity for VRP)

gcc/testsuite/ChangeLog:

2016-08-20  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR tree-optimization/61839
	* gcc.dg/tree-ssa/pr61839_1.c: New test.
	* gcc.dg/tree-ssa/pr61839_2.c: New test.
	* gcc.dg/tree-ssa/pr61839_3.c: New test.
	* gcc.dg/tree-ssa/pr61839_4.c: New test.

gcc/ChangeLog:

2016-08-20  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR tree-optimization/61839
	* tree-vrp.c (two_valued_val_range_p): New.
	(simplify_stmt_using_ranges): Convert CST BINOP VAR where VAR is
	two-valued to VAR == VAL1 ? (CST BINOP VAL1) : (CST BINOP VAL2).
	Also Convert VAR BINOP CST where VAR is two-valued to
	VAR == VAL1 ? (VAL1 BINOP CST) : (VAL2 BINOP CST).

From-SVN: r239637