[PATCH], Fix PowerPC PR target/71720 (bad vec_init of V4SF on power9)

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

Aaron Sawdey was running tests on the Power9 simulator, and he noticed that the
XXSPLTW to splat the SFmode value into the vector accessed the wrong element.
When I added the more general code for vector splat for power9, I called an
insn that reversed the element numbers on little endian, when I should have
called the direct function, since the XSCVDPSPN instruction leaves the
converted value in real element 0 in the hardware.

I did a bootstrap and make check with no regressions, can I check this into the
trunk?  And can I back port the patch to GCC 6.2 after a burn-in period?

[gcc]
2016-06-30  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/71720
	* config/rs6000/vsx.md (vsx_splat_v4sf_internal): When splitting
	the insns, use vsx_xxspltw_v4sf_direct which does not check for
	little endian.

[gcc/testsuite]
2016-06-30  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/71720
	* gcc.target/powerpc/pr71720.c: New test.

-- 
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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