[PATCH], PowerPC PR 61431, Fix little endian word swapping for 128-bit types

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

The pack01.c test fails on GCC 4.8 on little endian power8 systems. In looking
at it, it is a bug where the V1TI memory operations do not have the word
swapping define_split support.  GCC 4.9 and trunk can optimize the union to
stay in a register, so the test case passes on those systems, but it is still a
bug that would be exposed if you ever need to store vector __int128 values.
The test p8vector-int128-2.c is such a case, and it needs the fix.

I've tested this via bootstrap and make check on power8 big and little endian
systems, and there were no regressions.  The test p8vector-int128-2.c now
passes on the little endian power8 with this fix.

Are these patches ok to check into the trunk, and 4.9/4.8 branches?

2014-06-06  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/61431
	* config/rs6000/vsx.md (VSX_LE): Split VSX_D into 2 separate
	iterators, VSX_D that handles 64-bit types, and VSX_LE that
	handles swapping the two 64-bit double words on little endian
	systems.  Include V1TImode and optionally TImode in VSX_LE so that
	these types are properly swapped.  Change all of the insns and
	splits that do the 64-bit swaps to use VSX_LE.
	(vsx_le_perm_load_<mode>): Likewise.
	(vsx_le_perm_store_<mode>): Likewise.
	(splitters for little endian memory operations): Likewise.
	(vsx_xxpermdi2_le_<mode>): Likewise.
	(vsx_lxvd2x2_le_<mode>): Likewise.
	(vsx_stxvd2x2_le_<mode>): Likewise.

-- 
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797

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