[PATCH, powerpc] PR 53199, fix usage of __builtin_bswap64 on power6

[Michael Meissner <meissner at linux dot vnet dot ibm dot com>]

In trying to build machine specific versions of glibc with newer compilers, we
ran into a bug where the current glibc would not build on power6.  This was due
to glibc using the __builtin_swap64 builtin.  Power6 sets the
-mavoid-indexed-addresses option.  The splitter that I wrote when I wrote the
bswap64 did not have an alternate code path for -mavoid-indexed-addresses.
This patch adds the alternate code path.  I bootstraped it with today's
compiler and there were no regressions in make check.  Is it ok to apply?

[gcc]
2012-05-03  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/53199
	* config/rs6000/rs6000.md (bswapdi splitters): If
	-mavoid-indexed-addresses (or -mcpu=power6 which sets it by
	default) is used, generate an alternate sequence that does not
	depend on using indexed addressing.

[gcc/testsuite]
2012-05-03  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/53199
	* gcc.target/powwerpc/pr53199.c: New file.


-- 
Michael Meissner, IBM
5 Technology Place Drive, M/S 2757, Westford, MA 01886-3141, USA
meissner@linux.vnet.ibm.com	fax +1 (978) 399-6899

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