re PR target/82015 (PowerPC should check if 2nd argument to __builtin_unpackv1ti...

re PR target/82015 (PowerPC should check if 2nd argument to __builtin_unpackv1ti and similar functions is 0 or 1)

[gcc]
2017-08-29  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/82015
	* config/rs6000/rs6000.c (rs6000_expand_binop_builtin): Insure
	that the second argument of the built-in functions to unpack
	128-bit scalar types to 64-bit values is 0 or 1.  Change to use a
	switch statement instead a lot of if statements.
	* config/rs6000/rs6000.md (unpack<mode>, FMOVE128_VSX iterator):
	Allow 64-bit values to be in Altivec registers as well as
	traditional floating point registers.
	(pack<mode>, FMOVE128_VSX iterator): Likewise.

[gcc/testsuite]
2017-08-29  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/82015
	* gcc.target/powerpc/pr82015.c: New test.

From-SVN: r251432