[PATCH][4/4] Fix PR54733 Optimize endian independent load/store

["Thomas Preud'homme" <thomas dot preudhomme at arm dot com>]

Here is the fourth and last patch in the series. Its purpose is to add support
for bitwise operation from a source operand that are equivalent to a load
in the target's endianness.

ChangeLog are as follows:

*** gcc/ChangeLog ***

2014-05-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	PR tree-optimization/54733
	* tree-ssa-math-opts.c (nop_stats): New "bswap_stats" structure.
	(CMPNOP): Define.
	(find_bswap_load): Renamed to ...
	(find_bswap_or_nop_load): This.
	(find_bswap_1): Renamed to ...
	(find_bswap_or_nop_1): This.
	(find_bswap): Renamed to ...
	(find_bswap_or_nop): This. Also add detection of bitwise operations
	equivalent to load in host endianness.
	(bswap_replace): Likewise.
	(execute_optimize_bswap): Likewise.

*** gcc/testsuite/ChangeLog ***

2014-05-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	PR tree-optimization/54733
	* gcc.dg/optimize-bswapdi-3.c: Extend test to check detection of
	bitwise operation equivalent to load in host endianness.
	* gcc.dg/optimize-bswaphi-1.c: Likewise.
	* gcc.dg/optimize-bswapsi-2.c: Likewise.

Attachment: gcc32rm-84.5.1.part4.diff
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