[Bug bootstrap/66252] New: [6 regression] bootstrap comparison failures on sparc-linux

[Bug bootstrap/66252] New: [6 regression] bootstrap comparison failures on sparc-linux

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66252

            Bug ID: 66252
           Summary: [6 regression] bootstrap comparison failures on
                    sparc-linux
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mikpelinux at gmail dot com
  Target Milestone: ---

Attempting to bootstrap gcc trunk on sparc64-linux with options to default to
32-bit code, fails with:

Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Bootstrap comparison failure!
gcc/ggc-page.o differs
gcc/tree-ssa-alias.o differs
gcc/gimple-streamer-in.o differs
gcc/host-linux.o differs
gcc/lto-streamer-in.o differs
gcc/builtins.o differs
gcc/expmed.o differs
gcc/ipa-inline-analysis.o differs
gcc/lto-cgraph.o differs
gcc/dwarf2out.o differs
gcc/ipa-cp.o differs
gcc/fold-const.o differs
gcc/df-core.o differs
gcc/ipa-prop.o differs
gcc/lra-spills.o differs
gcc/tree-streamer-in.o differs
gcc/ubsan.o differs
gcc/ipa-inline.o differs
gcc/calls.o differs
gcc/ifcvt.o differs
gcc/cgraph.o differs
gcc/asan.o differs
gcc/profile.o differs
gcc/expr.o differs
gcc/lra-eliminations.o differs
gcc/ipa-devirt.o differs
gcc/ipa-profile.o differs
gcc/lto-streamer.o differs
gcc/real.o differs
gcc/lra-constraints.o differs
gcc/reload.o differs
gcc/gcov-dump.o differs
gcc/gimple-fold.o differs
gcc/ggc-common.o differs
gcc/combine.o differs
gcc/tree-ssa-threadupdate.o differs
gcc/value-prof.o differs
gcc/gcc.o differs
gcc/statistics.o differs
gcc/sched-rgn.o differs
libbacktrace/dwarf.o differs
libcpp/expr.o differs
libdecnumber/decimal128.o differs
make[2]: *** [compare] Error 1
make[2]: Leaving directory `/mnt/scratch/objdir'
make[1]: *** [stage3-bubble] Error 2
make[1]: Leaving directory `/mnt/scratch/objdir'
make: *** [bootstrap] Error 2

It appears to have going on for a while now, my last successful bootstrap of
trunk was with the 20150419 snapshot.  Starting a bisection now.

Configured with:
/mnt/scratch/gcc-trunk-r223498/configure --prefix=/mnt/scratch/install6
--with-gmp=/home/mikpe/pkgs/linux-sparc64/gmp-6.0.0
--with-mpfr=/home/mikpe/pkgs/linux-sparc64/mpfr-3.1.2
--with-mpc=/home/mikpe/pkgs/linux-sparc64/mpc-1.0.3 --enable-multilib
--disable-plugin --disable-lto --disable-nls --enable-threads=posix
--enable-checking=release --disable-libmudflap --enable-languages=c,c++
--build=sparc-unknown-linux --target=sparc-unknown-linux --with-cpu=ultrasparc
--enable-targets=all --disable-libsanitizer

[Bug bootstrap/66252] [6 regression] bootstrap comparison failures on sparc-linux

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66252

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |6.0

[Bug bootstrap/66252] [6 regression] bootstrap comparison failures on sparc-linux

[andreast at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66252

--- Comment #2 from Andreas Tobler <andreast at gcc dot gnu.org> ---
I see the same failures on sparc-solaris 10

[Bug bootstrap/66252] [6 regression] bootstrap comparison failures on sparc-linux

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66252

--- Comment #3 from Mikael Pettersson <mikpelinux at gmail dot com> ---
Still occurs with trunk @ r223652.

[Bug bootstrap/66252] [6 regression] bootstrap comparison failures on sparc-linux

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66252

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-05-26
                 CC|                            |ebotcazou at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Confirmed by Andreas.

[Bug bootstrap/66252] [6 regression] bootstrap comparison failures on sparc-linux

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66252

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
            Version|unknown                     |6.0
           Assignee|unassigned at gcc dot gnu.org      |ebotcazou at gcc dot gnu.org

--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
I'm going to have a look.

[Bug bootstrap/66252] [6 regression] bootstrap comparison failures on sparc-linux

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66252

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
It's a known fragility of the SPARC back-end in 32-bit mode, which really wants
to forbid DImode values in odd-numbered registers.  The problem is that the
calling conventions for 'long long' disagree, so DImode destinations can be
odd-numbered registers in the end...

[Bug bootstrap/66252] [6 regression] bootstrap comparison failures on sparc-linux

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66252

--- Comment #8 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Thu Jun 11 15:56:30 2015
New Revision: 224384

URL: https://gcc.gnu.org/viewcvs?rev=224384&root=gcc&view=rev
Log:
        PR bootstrap/66252
        * config/sparc/sparc.c (hard_regno_mode_classes): Add ??? comment.
        * config/sparc/sparc.md (zero_extendsidi2_insn_sp32): Use single order.
        (*addx_extend_sp32): Fix pasto.
        (*subx_extend): Rename into...
        (*subx_extend_sp32): ...this.
        (*adddi3_extend_sp32): Add earlyclobber.
        (*subdi3_insn_sp32): Likewise.
        (*subdi3_extend_sp32): Likewise.
        (*and_not_di_sp32): Likewise.
        (*or_not_di_sp32): Likewise.
        (*xor_not_di_sp32): Likewise.
        (*negdi2_sp32): Likewise.
        (*one_cmpldi2_sp32): Likewise.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/sparc/sparc.c
    trunk/gcc/config/sparc/sparc.md

[Bug bootstrap/66252] [6 regression] bootstrap comparison failures on sparc-linux

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66252

--- Comment #9 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Thu Jun 11 15:58:32 2015
New Revision: 224385

URL: https://gcc.gnu.org/viewcvs?rev=224385&root=gcc&view=rev
Log:
        PR bootstrap/66252
        * config/sparc/sparc.c (hard_regno_mode_classes): Add ??? comment.
        * config/sparc/sparc.md (zero_extendsidi2_insn_sp32): Use single order.
        (*addx_extend_sp32): Fix pasto.
        (*subx_extend): Rename into...
        (*subx_extend_sp32): ...this.
        (*adddi3_extend_sp32): Add earlyclobber.
        (*subdi3_insn_sp32): Likewise.
        (*subdi3_extend_sp32): Likewise.
        (*and_not_di_sp32): Likewise.
        (*or_not_di_sp32): Likewise.
        (*xor_not_di_sp32): Likewise.
        (*negdi2_sp32): Likewise.
        (*one_cmpldi2_sp32): Likewise.

Modified:
    branches/gcc-5-branch/gcc/ChangeLog
    branches/gcc-5-branch/gcc/config/sparc/sparc.c
    branches/gcc-5-branch/gcc/config/sparc/sparc.md

[Bug bootstrap/66252] [6 regression] bootstrap comparison failures on sparc-linux

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66252

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #11 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
This should be fixed at last.