gcc/

	Backport from trunk r242869.
	2016-11-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	PR tree-optimization/77673
	* tree-ssa-math-opts.c (struct symbolic_number): Add new src field.
	(init_symbolic_number): Initialize src field from src parameter.
	(perform_symbolic_merge): Select most dominated statement as the
	source statement.  Set src field of resulting n structure from the
	input src with the lowest address.
	(find_bswap_or_nop): Rename source_stmt into ins_stmt.
	(bswap_replace): Rename src_stmt into ins_stmt.  Initially get source
	of load from src field rather than insertion statement.  Cancel
	optimization if statement analyzed is not dominated by the insertion
	statement.
	(pass_optimize_bswap::execute): Rename src_stmt to ins_stmt.  Compute
	dominance information.

	gcc/testsuite/
	Backport from trunk r242869.
	2016-11-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	PR tree-optimization/77673
	* gcc.dg/pr77673.c: New test.

	gcc/
	Backport from trunk r242870.
	2016-11-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* tree-ssa-math-opts.c (struct symbolic_number): Improve comment.

Change-Id: I79c6f848a9b7d80130b151cb62c4f2f0c672053b

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