[PATCH] S/390: Improve risbg usage

[PATCH] S/390: Improve risbg usage

gcc/ChangeLog:

2015-07-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	    * config/s390/s390.c (s390_rtx_costs): Make risbg patterns
	    cheaper.
	    (s390_expand_insv): Don't generate risbg pattern for constant zero
	    sources.
	    * config/s390/s390.md ("*insv<mode>_zEC12_appendbitsleft")
	    ("*insv<mode>_z10_appendbitsleft"): New pattern definitions.  New
	    splitters.

gcc/testsuite/ChangeLog:

2015-07-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	    * gcc.target/s390/insv-1.c: New test.
	    * gcc.target/s390/insv-2.c: New test.
	    * gcc.target/s390/insv-3.c: New test.

From-SVN: r226148