[Bug 1522410] Comment bridged from LTC Bugzilla

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------- Comment From wschmidt at us.ibm.com 2016-01-19 11:09 EDT-------
The feature is not working.  Using

gcc version 5.3.1 20160112 (Ubuntu 5.3.1-5ubuntu3)

I attempted to compile a program with -mcpu=power9.  Results:

?  src  gcc -mcpu=power9 -O3 p9-lxvx-stxvx-1.c
gcc: error: unrecognized argument in option ?-mcpu=power9?
gcc: note: valid arguments to ?-mcpu=? are: 401 403 405 405fp 440 440fp 464 464fp 476 476fp 505 601 602 603 603e 604 604e 620 630 740 7400 7450 750 801 821 823 8540 8548 860 970 G3 G4 G5 a2 cell e300c2 e300c3 e500mc e500mc64 e5500 e6500 ec603e native power3 power4 power5 power5+ power6 power6x power7 power8 powerpc powerpc64 powerpc64le rs64 titan

So at least one important patch is missing.  The trunk patch to enable
-mcpu=power9 is:

2015-11-09  Michael Meissner  <meissner at linux.vnet.ibm.com>
Peter Bergner  <bergner at vnet.ibm.com>

* config/rs6000/rs6000.opt (-mpower9-fusion): Add new switches for
ISA 3.0 (power9).
(-mpower9-vector): Likewise.
(-mpower9-dform): Likewise.
(-mpower9-minmax): Likewise.
(-mtoc-fusion): Likewise.
(-mmodulo): Likewise.
(-mfloat128-hardware): Likewise.

* config/rs6000/rs6000-cpus.def (ISA_3_0_MASKS_SERVER): Add option
mask for ISA 3.0 (power9).
(POWERPC_MASKS): Add new ISA 3.0 switches.
(power9 cpu): Add power9 cpu.

* config/rs6000/rs6000.h (ASM_CPU_POWER9_SPEC): Add support for power9.
(ASM_CPU_SPEC): Likewise.
(EXTRA_SPECS): Likewise.

* config/rs6000/rs6000-opts.h (enum processor_type): Add
PROCESSOR_POWER9.

* config/rs6000/rs6000.c (power9_cost): Initial cost setup for power9.
(rs6000_debug_reg_global): Add support for power9 fusion.
(rs6000_setup_reg_addr_masks): Cache mode size.
(rs6000_option_override_internal): Until real power9 tuning is
added, use -mtune=power8 for -mcpu=power9.
(rs6000_setup_reg_addr_masks): Do not allow pre-increment,
pre-decrement, or pre-modify on SFmode/DFmode if we allow the use
of Altivec registers.
(rs6000_option_override_internal): Add support for ISA 3.0 switches.
(rs6000_loop_align): Add support for power9 cpu.
(rs6000_file_start): Likewise.
(rs6000_adjust_cost): Likewise.
(rs6000_issue_rate): Likewise.
(insn_must_be_first_in_group): Likewise.
(insn_must_be_last_in_group): Likewise.
(force_new_group): Likewise.
(rs6000_register_move_cost): Likewise.
(rs6000_opt_masks): Likewise.

* config/rs6000/rs6000.md (cpu attribute): Add power9.
* config/rs6000/rs6000-tables.opt: Regenerate.

* config/rs6000/rs6000-c.c (rs6000_target_modify_macros): Define
_ARCH_PWR9 if power9 support is available.

* config/rs6000/aix61.h (ASM_CPU_SPEC): Add power9.
* config/rs6000/aix53.h (ASM_CPU_SPEC): Likewise.

* configure.ac: Determine if the assembler supports the ISA 3.0
instructions.
* config.in (HAVE_AS_POWER9): Likewise.
* configure: Regenerate.

* doc/invoke.texi (RS/6000 and PowerPC Options): Document ISA 3.0
switches.

In branches/ibm/gcc-5-branch, I see that this patch is present:

2015-11-20  Michael Meissner  <meissner at linux.vnet.ibm.com>

Back port from trunk
2015-11-09  Michael Meissner  <meissner at linux.vnet.ibm.com>
Peter Bergner  <bergner at vnet.ibm.com>

* config/rs6000/rs6000.opt (-mpower9-fusion): Add new switches for
etc.

So at least this patch was not picked up, which brings into question
whether any of the Power9 patches were picked up.

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https://bugs.launchpad.net/bugs/1522410

Title:
  [Ubuntu 16.04] Enable P9 toolchain

Status in gcc-5 package in Ubuntu:
  Fix Released

Bug description:
  This is a feature request to track the inclusion of POWER9 enabled in
  Ubuntu.

  This is required as a building block for POWER9 development in Ubuntu
  16.04. The final goal is to have Ubuntu 17.04 as the primary distro to
  (partially?) support POWER9 machines.

  Mirroring for Canonical awareness. A backport will be required.

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