This patch adds instruction scheduling support for the Power9 processor. Bootstrap/regression tested on powerpc64/powerpc64le with no new failures. Ok for trunk? Ok for backport to GCC 6 branch after successful bootstrap/regtest there?

-Pat


2016-06-21  Pat Haugen  <pthaugen@us.ibm.com>

        * config/rs6000/power8.md (power8-fp): Include dfp type.
        * config/rs6000/power6.md (power6-fp): Likewise.
        * config/rs6000/htm.md (various insns): Change type atribute to 
        htmsimple and set power9_alu2 appropriately.
        * config/rs6000/power9.md: New file.
        * config/rs6000/t-rs6000 (MD_INCLUDES): Add power9.md.
        * config/rs6000/power7.md (power7-fp): Include dfp type.
        * config/rs6000/rs6000.c (power9_cost): Update costs, cache size
        and prefetch streams.
        (rs6000_option_override_internal): Remove temporary code setting
        tuning to power8. Don't set rs6000_sched_groups for power9.
        (last_scheduled_insn): Change to rtx_insn *.
        (divCnt, vec_load_pendulum): New variables.
        (rs6000_adjust_cost): Add Power9 to test for store->load separation.
        (rs6000_issue_rate): Set issue rate for Power9.
        (is_power9_pairable_vec_type): New.
        (rs6000_sched_reorder2): Add Power9 code to group fixed point divide
        insns and group/alternate vector operations with vector loads.
        (insn_must_be_first_in_group): Remove Power9.
        (insn_must_be_last_in_group): Likewise.
        (force_new_group): Likewise.
        (rs6000_sched_init): Fix initialization of last_scheduled_insn.
        Initialize divCnt/vec_load_pendulum.
        (_rs6000_sched_context, rs6000_init_sched_context,
        rs6000_set_sched_context): Handle context save/restore of new
        variables.
        * config/rs6000/vsx.md (various insns): Set power9_alu2 attribute.
        * config/rs6000/altivec.md (various insns): Likewise.
        * config/rs6000/dfp.md (various insns): Change type attribute to dfp.
        *  config/rs6000/crypto.md (crypto_vshasigma<CR_char>): Change type
        and set power9_alu2.
        * config/rs6000/rs6000.md ('type' attribute): Add htmsimple/dfp types.
        Define "power9_alu2" and "mnemonic" attributes.
        Include power9.md.
        (*cmp<mode>_fpr, *fpmask<mode>): Set power9_alu2 attribute.
        (*cmp<mode>_hw): Change type to veccmp.