re PR tree-optimization/54733 (Missing opportunity to optimize endian independent...

re PR tree-optimization/54733 (Missing opportunity to optimize endian independent load/store)

2014-05-23  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	PR tree-optimization/54733
gcc/
	* tree-ssa-math-opts.c (nop_stats): New "bswap_stats" structure.
	(CMPNOP): Define.
	(find_bswap_or_nop_load): New.
	(find_bswap_1): Renamed to ...
	(find_bswap_or_nop_1): This. Also add support for memory source.
	(find_bswap): Renamed to ...
	(find_bswap_or_nop): This. Also add support for memory source and
	detection of bitwise operations equivalent to load in host endianness.
	(execute_optimize_bswap): Likewise. Also move its leading comment back
	in place and split statement transformation into ...
	(bswap_replace): This.

gcc/testsuite
	* gcc.dg/optimize-bswapdi-3.c: New test to check extension of bswap
	optimization to support memory sources and bitwise operations
	equivalent to load in host endianness.
	* gcc.dg/optimize-bswaphi-1.c: Likewise.
	* gcc.dg/optimize-bswapsi-2.c: Likewise.
	* gcc.c-torture/execute/bswap-2.c: Likewise.

From-SVN: r210843