predicates.md (fusion_gpr_addis): New predicates to support power8 load fusion.

predicates.md (fusion_gpr_addis): New predicates to support power8 load fusion.

[gcc]
2013-07-31  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* config/rs6000/predicates.md (fusion_gpr_addis): New predicates
	to support power8 load fusion.
	(fusion_gpr_mem_load): Likewise.

	* config/rs6000/rs6000-modes.def (PTImode): Update a comment.

	* config/rs6000/rs6000-protos.h (fusion_gpr_load_p): New
	declarations for power8 load fusion.
	(emit_fusion_gpr_load): Likewise.

	* config/rs6000/rs6000.c (rs6000_option_override_internal): If
	tuning for power8, turn on fusion mode by default.  Turn on sign
	extending fusion mode if normal fusion mode is on, and we are at
	-O2 or -O3.
	(fusion_gpr_load_p): New function, return true if we can fuse an
	addis instruction with a dependent load to a GPR.
	(emit_fusion_gpr_load): Emit the instructions for power8 load
	fusion to GPRs.

	* config/rs6000/vsx.md (VSX_M2): New iterator for fusion
	peepholes.
	(VSX load fusion peepholes): New peepholes to fuse together an
	addi instruction with a VSX load instruction.

	* config/rs6000/rs6000.md (GPR load fusion peepholes): New
	peepholes to fuse an addis instruction with a load to a GPR base
	register.  If we are supporting sign extending fusions, convert
	sign extending loads to zero extending loads and add an explicit
	sign extension.

[gcc/testsuite]
2013-07-31  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* gcc.target/powerpc/fusion.c: New file, test power8 fusion
	support.

From-SVN: r201385