[PATCH, powerpc], Fix PR48857, pass/return V2DI as other vector types

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

When I added VSX support to the powerpc, I overlooked passing and return
V2DImode arguments, since the only machine operation that supports V2DI is
vector floating point conversion.  Consequentally, V2DI types were passed and
returned in GPRs instead of the vector registers on power7.

This patch fixes that so that V2DImode values are passed and returned like
other vector types.

I did a bootstrap and make check with no regressions, comparing it to a build
without the patch.  I also wrote a program that passed and returned every
single type, and I compared the assembly ouptut.  With the exception of
functions that return or are passed V2DI arguments, the code is identical.  I
tested:

	-m64			(implies -mabi=altivec)
	-m32 -mabi=altivec
	-m32 -mabi=no-altivec	(no difference here)

Is this patch ok to install?  I will also want to install it in the 4.6 and
possibly 4.5 trees as well.

[gcc]
2011-05-03  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/48857
	* config/rs6000/rs6000.h (VSX_SCALAR_MODE): Delete.
	(VSX_MODE): Ditto.
	(VSX_MOVE_MODE): Ditto.
	(ALTIVEC_OR_VSX_VECTOR_MODE): New macro, combine all Altivec and
	VSX vector types.  Add V2DImode.
	(HARD_REGNO_CALLER_SAVE_MODE): Use it instead of
	ALTIVEC_VECTOR_MODE and VSX_VECTOR_MODE calls.
	(MODES_TIEABLE_P): Ditto.

	* config/rs6000/rs6000.c (rs6000_emit_move): Use
	ALTIVEC_OR_VSX_MODE instead of ALTIVEC_VECTOR_MODE and
	VSX_VECTOR_MODE.
	(init_cumulative_args): Ditto.
	(rs6000_function_arg_boundary): Ditto.
	(rs6000_function_arg_advance_1): Ditto.
	(rs6000_function_arg): Ditto.
	(rs6000_function_ok_for_sibcall): Ditto.
	(emit_frame_save): Ditto.
	(rs6000_function_value): Ditto.
	(rs6000_libcall_value): Ditto.

[gcc/testsuite]
2011-05-03  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/48857
	* gcc.target/powerpc/pr48857.c: New file, make sure V2DI arguments
	are passed and returned in vector registers.

-- 
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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