[Bug target/64205] New: powerpc64-linux --with-cpu=G5 bootstrap failure

[Bug target/64205] New: powerpc64-linux --with-cpu=G5 bootstrap failure

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

            Bug ID: 64205
           Summary: powerpc64-linux --with-cpu=G5 bootstrap failure
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: amodra at gmail dot com

Created attachment 34207
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34207&action=edit
preprocessed source

revision 218414

/home/alan/build/ppc/gcc-virgin/./gcc/xgcc
-B/home/alan/build/ppc/gcc-virgin/./gcc/
-B/usr/local/powerpc64-unknown-linux-gnu/bin/ -B
/usr/local/powerpc64-unknown-linux-gnu/lib/ -isystem
/usr/local/powerpc64-unknown-linux-gnu/include -isystem
/usr/local/powerpc64-unknown-linux-gnu/sys-include -g -O2 -m32 -O2  -g -O2
-DIN_GCC -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-format
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem
./include   -fPIC -mlong-double-128 -mno-minimal-toc -g -DIN_LIBGCC2
-fbuilding-libgcc -fno-stack-protector -fPIC -mlong-double-128 -mno-minimal-toc
-I. -I. -I../../.././gcc -I/src/gcc-virgin/libgcc -I/src/gcc-virgin/libgcc/.
-I/src/gcc-virgin/libgcc/../gcc -I/src/gcc-virgin/libgcc/../include
-I/src/gcc-virgin/libgcc/../libdecnumber/dpd
-I/src/gcc-virgin/libgcc/../libdecnumber -DHAVE_CC_TLS  -o _addsub_sd.o -MT
_addsub_sd.o -MD -MP -MF _addsub_sd.dep -DFINE_GRAINED_LIBRARIES -DL_addsub_sd
-DWIDTH=32 -c /src/gcc-virgin/libgcc/dfp-bit.c
/src/gcc-virgin/libgcc/dfp-bit.c: In function '__dpd_addsd3':
/src/gcc-virgin/libgcc/dfp-bit.c:247:1: error: insn does not satisfy its
constraints:
 }
 ^
(insn 305 195 201 26 (set (reg/i:SD 33 1)
        (mem/c:SD (plus:SI (reg/f:SI 1 1)
                (const_int 84 [0x54])) [0 res32.c+0 S4 A32]))
/src/gcc-virgin/libgcc/dfp-bit.c:247 463 {movsd_hardfloat}
     (nil))

Seems to be caused by r217679.  r217678 is the last revision to bootstrap for
me.  Note that you can see the failure by compiling the attachment with -m32
-mcpu=G5 using any recent powerpc gcc.

[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |build
             Target|                            |powerpc64-*-*
   Target Milestone|---                         |5.0
            Summary|powerpc64-linux             |[5 Regression]
                   |--with-cpu=G5 bootstrap     |powerpc64-linux
                   |failure                     |--with-cpu=G5 bootstrap
                   |                            |failure

[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1

[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

Peter Bergner <bergner at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |azanella at linux dot vnet.ibm.com

--- Comment #1 from Peter Bergner <bergner at gcc dot gnu.org> ---
*** Bug 64687 has been marked as a duplicate of this bug. ***

[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

Peter Bergner <bergner at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-01-20
                 CC|                            |bergner at gcc dot gnu.org,
                   |                            |meissner at gcc dot gnu.org,
                   |                            |uweigand at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Peter Bergner <bergner at gcc dot gnu.org> ---
Confirmed.  Here's a simplified test case and simplified options:

[bergner@makalu-lp1 PR64687]$ cat decode.i 
union ieee754r_Decimal32
{
  _Decimal32 sd;
  unsigned int cc0;
};

unsigned int
__decoded32 (_Decimal32 a)
{
    union ieee754r_Decimal32 d;
    d.sd = a;
    return d.cc0;
}

[bergner@makalu-lp1 PR64687]$
/home/bergner/gcc/build/gcc-fsf-mainline-pr64687-debug/gcc/xgcc
-B/home/bergner/gcc/build/gcc-fsf-mainline-pr64687-debug/gcc -O1 -mno-hard-dfp
-mcpu=power7 -S decode.i 
decode.i: In function ‘__decoded32’:
decode.i:13:1: error: insn does not satisfy its constraints:
 }
 ^
(insn 16 4 3 2 (set (mem/c:SD (plus:DI (reg/f:DI 1 1)
                (const_int 48 [0x30])) [0 a+0 S4 A64])
        (reg:SD 33 1)) decode.i:9 492 {movsd_hardfloat}
     (nil))
decode.i:13:1: internal compiler error: in extract_constrain_insn, at
recog.c:2246

Basically we hit this with "-O1 -mno-hard-dfp -maltivec" which matches the ICE
seen with "-mcpu=G5" and "-mno-hard-dfp -mcpu=power7".
>From gcc-bugs-return-474146-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 20 23:23:33 2015
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Subject: [Bug c++/64701] New: internal compiler error:=?UTF-8?Q? unexpected expression ‘?=<statement>=?UTF-8?Q?’ of kind do_stmt?Date: Tue, 20 Jan 2015 23:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64701

            Bug ID: 64701
           Summary: internal compiler error: unexpected expression
                    ‘<statement>’ of kind do_stmt
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org

Created attachment 34508
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34508&action=edit
preprocessed source

$ ./cc1plus -quiet -fpreprocessed ccBLvhHJ.err -o /dev/null 
In file included from
/builddir/build/BUILD/open-vm-tools-9.4.6-1770165/lib/include/hostinfo.h:34:0,
                 from dndGuest/rpcV3Util.cpp:45:
/builddir/build/BUILD/open-vm-tools-9.4.6-1770165/lib/include/x86cpuid.h: In
function ‘uint32 CPUID_EFFECTIVE_FAMILY(uint32)’:
/builddir/build/BUILD/open-vm-tools-9.4.6-1770165/lib/include/x86cpuid.h:1038:339:
internal compiler error: unexpected expression ‘<statement>’ of kind do_stmt
0x86232f cxx_eval_constant_expression
    /home/marek/src/gcc/gcc/cp/constexpr.c:3450
0x86710f cxx_eval_statement_list
    /home/marek/src/gcc/gcc/cp/constexpr.c:2855
0x8619fd cxx_eval_constant_expression
    /home/marek/src/gcc/gcc/cp/constexpr.c:3374
0x8620ba cxx_eval_constant_expression
    /home/marek/src/gcc/gcc/cp/constexpr.c:3380
0x86748b cxx_eval_outermost_constant_expr
    /home/marek/src/gcc/gcc/cp/constexpr.c:3505
0x86acf8 maybe_constant_value(tree_node*, tree_node*)
    /home/marek/src/gcc/gcc/cp/constexpr.c:3617
0x7b1bcc cp_convert_and_check(tree_node*, tree_node*, int)
    /home/marek/src/gcc/gcc/cp/cvt.c:639
0x64fd87 convert_like_real
    /home/marek/src/gcc/gcc/cp/call.c:6565
0x650e31 perform_implicit_conversion_flags(tree_node*, tree_node*, int, int)
    /home/marek/src/gcc/gcc/cp/call.c:9405
0x6f8fe1 digest_init_r
    /home/marek/src/gcc/gcc/cp/typeck2.c:1068
0x6fbf5a digest_init_flags
    /home/marek/src/gcc/gcc/cp/typeck2.c:1137
0x6fbf5a store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
    /home/marek/src/gcc/gcc/cp/typeck2.c:811
0x6698e4 check_initializer
    /home/marek/src/gcc/gcc/cp/decl.c:5980
0x690bdc cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
    /home/marek/src/gcc/gcc/cp/decl.c:6616
0x776229 cp_parser_init_declarator
    /home/marek/src/gcc/gcc/cp/parser.c:17291
0x7779ad cp_parser_simple_declaration
    /home/marek/src/gcc/gcc/cp/parser.c:11601
0x7571d3 cp_parser_block_declaration
    /home/marek/src/gcc/gcc/cp/parser.c:11475
0x758421 cp_parser_declaration_statement
    /home/marek/src/gcc/gcc/cp/parser.c:11122
0x75b687 cp_parser_statement
    /home/marek/src/gcc/gcc/cp/parser.c:9830
0x75be89 cp_parser_statement_seq_opt
    /home/marek/src/gcc/gcc/cp/parser.c:10108
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
>From gcc-bugs-return-474147-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 20 23:36:30 2015
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd701

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reducing.

[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

Segher Boessenkool <segher at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |segher at gcc dot gnu.org

--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Doesn't happen with -mlra.

[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

--- Comment #4 from Michael Meissner <meissner at gcc dot gnu.org> ---
Is -mcpu=power7 -mno-hard-dfp really a reasonable option?

I built a toolchain using --with-cpu=power5 from subversion id 219607 on a
powerpc64 linux system, and the system bootstrapped.

If I compile the code that Peter mentioned using -m32 -O2 -fPIC -S foo01.c
-mlong-double-128 -mno-minimal-toc -g -fbuilding-libgcc -fno-stack-protector -g
-mcpu=power5, it compiles fine.

As seger mentions, -mlra fixes this (but there are still problems with -mlra).

It does fail if you enable the stfiwx instruction (added in power7), but
disable DFP.  How many people do this?  I'm not sure this is a representation
of the original bug.

I suspect if you changed TARGET_NO_SDMODE_STACK in rs6000.h to eliminate the
TARGET_DFP test it should work.
#define TARGET_NO_SDMODE_STACK    (TARGET_LFIWZX && TARGET_STFIWX)

[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

--- Comment #5 from Michael Meissner <meissner at gcc dot gnu.org> ---
Ah, ok, it helps to read the bug report.  If you bootstrap with --with-cpu=G5
it fails, --with-cpu=power5 passes.

[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

Michael Meissner <meissner at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |meissner at gcc dot gnu.org

[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

--- Comment #6 from Michael Meissner <meissner at gcc dot gnu.org> ---
Created attachment 34680
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34680&action=edit
Proposed patch to fix the problem

[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

--- Comment #7 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Fri Feb  6 19:15:56 2015
New Revision: 220485

URL: https://gcc.gnu.org/viewcvs?rev=220485&root=gcc&view=rev
Log:
[gcc]
2015-02-06  Michael Meissner  <meissner@linux.vnet.ibm.com>

    PR target/64205
    * config/rs6000/rs6000.c (rs6000_init_hard_regno_mode_ok): Do not
    add a general secondary reload handler for SDmode, unless we have
    both read/write support for SDmode.

[gcc/testsuite]
2015-02-06  Michael Meissner  <meissner@linux.vnet.ibm.com>

    PR target/64205
    * gcc.target/powerpc/pr64205.c: New file.


Added:
    trunk/gcc/testsuite/gcc.target/powerpc/pr64205.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/rs6000/rs6000.c
    trunk/gcc/testsuite/ChangeLog

[Bug target/64205] [5 Regression] powerpc64-linux --with-cpu=G5 bootstrap failure

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64205

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
                 CC|                            |jakub at gcc dot gnu.org
         Resolution|---                         |FIXED

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.