re PR tree-optimization/67351 (Missed optimisation on 64-bit field compared to 32...

re PR tree-optimization/67351 (Missed optimisation on 64-bit field compared to 32-bit)

2015-09-03  Naveen H.S  <Naveen.Hurugalawadi@caviumnetworks.com>

	PR middle-end/67351

	gcc/ChangeLog:
	* fold-const.c (fold_binary_loc) : Move
	Transform (x >> c) << c into x & (-1<<c) or
	transform (x << c) >> c into x & ((unsigned)-1 >> c) for unsigned
	types using simplify and match.
	* match.pd (lshift (rshift @0 INTEGER_CST@1) @1) : New simplifier.
	(rshift (lshift @0 INTEGER_CST@1) @1) : New Simplifier.

	gcc/testsuite/ChangeLog:
	* g++.dg/pr66752-2.C: New test.

From-SVN: r227432