re PR target/67808 (LRA ICEs on simple double to long double conversion test case)

re PR target/67808 (LRA ICEs on simple double to long double conversion test case)

[gcc]
2015-10-05  Michael Meissner  <meissner@linux.vnet.ibm.com>
	    Peter Bergner  <bergner@vnet.ibm.com>

	PR target/67808
	* config/rs6000/rs6000.md (extenddftf2): In the expander, only
	allow registers, but provide insns for the combiner to create for
	loads from memory. Separate VSX code from non-VSX code. For
	non-VSX code, combine extenddftf2_fprs into extenddftf2 and rename
	externaldftf2_internal to externaldftf2_fprs. Reorder constraints
	so that registers come before memory operations. Drop support from
	converting DFmode to TFmode, if the DFmode value is in a GPR
	register.
	(extenddftf2_fprs): Likewise.
	(extenddftf2_internal): Likewise.
	(extenddftf2_vsx): Likewise.
	(extendsftf2): In the expander, only allow registers, but provide
	insns for the combiner to create for stores and loads.

[gcc/testsuite]
2015-10-05  Michael Meissner  <meissner@linux.vnet.ibm.com>
	    Peter Bergner <bergner@vnet.ibm.com>

	PR target/67808
	* gcc.target/powerpc/pr67808.c: New test.

Co-Authored-By: Peter Bergner <bergner@vnet.ibm.com>
From-SVN: r228538