[PATCH] Fix some powerpc debug options

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

I was recently trying to turn on some of the debug options I put in when doing
the initial power7 work to track down some performance regressions.  The
following patches fix problems that come up in telling the compiler to use the
traditional floating point insns for scalar mode on power7
(-mno-vsx-scalar-double).  It also adds reload helpers for using the VSX memory
load instructions when the compiler is allowed to use VSX memory instructions
for scalars.  There were no regressions with these patches.  Are they ok to be
checked in?

2012-01-09  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (rs6000_init_hard_regno_mode_ok): Add DF
	reload patterns if -mvsx-scalar-memory.

	* config/rs6000/vsx.md (vsx_xscvspdp): Allow xscvspdp to be
	generated, even -mno-vsx-scalar-double was used.
	(vsx_xscvdpsp_scalar): Likewise.
	(vsx_xscvspdp_scalar2): Likewise.

-- 
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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