[Bug bootstrap/53266] New: Error: Unrecognized opcode: `mulhwu'

[Bug bootstrap/53266] New: Error: Unrecognized opcode: `mulhwu'

[skunk at iskunk dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

             Bug #: 53266
           Summary: Error: Unrecognized opcode: `mulhwu'
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: skunk@iskunk.org
              Host: powerpc-ibm-aix4.3.2.0
            Target: powerpc-ibm-aix4.3.2.0
             Build: powerpc-ibm-aix4.3.2.0


Bootstrapping GCC 4.7.0 on AIX 4.3 fails with

[...]
gmake[3]: Entering directory `/tmp/gcc-build/powerpc-ibm-aix4.3.2.0/libgcc'
# If this is the top-level multilib, build all the other
# multilibs.
DEFINES='' HEADERS='' \
        /home/src/gcc-4.7.0/libgcc/mkheader.sh > tmp-libgcc_tm.h
/opt/freeware/bin/bash /home/src/gcc-4.7.0/libgcc/../move-if-change
tmp-libgcc_tm.h libgcc_tm.h
echo timestamp > libgcc_tm.stamp
/tmp/gcc-build/./gcc/xgcc -B/tmp/gcc-build/./gcc/
-B/opt/tg/powerpc-ibm-aix4.3.2.0/bin/ -B/opt/tg/powerpc-ibm-aix4.3.2.0/lib/
-isystem /opt/tg/powerpc-ibm-aix4.3.2.0/include -isystem
/opt/tg/powerpc-ibm-aix4.3.2.0/sys-include    -g -O2 -O2  -g -O2 -DIN_GCC   -W
-Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition  -isystem ./include   -mlong-double-128 -g -DIN_LIBGCC2
-fbuilding-libgcc -fno-stack-protector   -mlong-double-128 -I. -I.
-I../.././gcc -I/home/src/gcc-4.7.0/libgcc -I/home/src/gcc-4.7.0/libgcc/.
-I/home/src/gcc-4.7.0/libgcc/../gcc -I/home/src/gcc-4.7.0/libgcc/../include 
-DHAVE_CC_TLS -DUSE_EMUTLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep
-DL_muldi3 -c /home/src/gcc-4.7.0/libgcc/libgcc2.c 
/tmp//cczJLmgC.s: Assembler messages:
/tmp//cczJLmgC.s:379: Error: Unrecognized opcode: `mulhwu'
gmake[3]: *** [_muldi3.o] Error 1
gmake[3]: Leaving directory `/tmp/gcc-build/powerpc-ibm-aix4.3.2.0/libgcc'
gmake[2]: *** [all-stage1-target-libgcc] Error 2
gmake[2]: Leaving directory `/tmp/gcc-build'
gmake[1]: *** [stage1-bubble] Error 2
gmake[1]: Leaving directory `/tmp/gcc-build'
gmake: *** [bootstrap-lean] Error 2


It appears to be the same issue as reported in a comment long ago:

    http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12691#c2

My error was obtained using --with-gnu-as and --disable-multilib.

After some experimentation, I got rid of --disable-multilib, and configured the
tree with --with-cpu=powerpc --disable-aix64 --disable-powercpu, which allowed
the bootstrap to proceed without the above error. However, given that
build=host=target, and that the system triplet explicitly denotes a 32-bit
PowerPC processor, the configuration phase should have detected the need to
avoid unsupported instructions on its own.

[Bug bootstrap/53266] Error: Unrecognized opcode: `mulhwu'

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-05-07 17:27:53 UTC ---
mulhwu is a powerpc but not rs6000 instruction.

[Bug bootstrap/53266] Error: Unrecognized opcode: `mulhwu'

[skunk at iskunk dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

--- Comment #2 from Daniel Richard G. <skunk at iskunk dot org> 2012-05-07 17:42:43 UTC ---
(In reply to comment #1)
> mulhwu is a powerpc but not rs6000 instruction.

When a file failed to compile, I noticed that specifying -mcpu=powerpc got
things going again. I'm not clear on how GCC distinguishes powerpc versus
rs6000, but as far as -mcpu is concerned, the former value seems to exclude
mulhwu.

[Bug bootstrap/53266] Error: Unrecognized opcode: `mulhwu'

[segher at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

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> 2012-09-25 07:31:33 UTC ---
Hi Daniel,

Does this still fail?

[Bug bootstrap/53266] Error: Unrecognized opcode: `mulhwu'

[skunk at iskunk dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

--- Comment #4 from Daniel Richard G. <skunk at iskunk dot org> 2012-09-25 10:56:41 UTC ---
(In reply to comment #3)
> Does this still fail?

I haven't built GCC on the AIX 4.3 (PowerPC 604) system lately, but my scripts
are set up to do so using

    --with-cpu=powerpc --disable-aix64 --disable-powercpu

in order to avoid this issue. Should I be able to drop any of these, at this
point?

[Bug bootstrap/53266] Error: Unrecognized opcode: `mulhwu'

[segher at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> 2012-09-25 11:44:42 UTC ---
> I haven't built GCC on the AIX 4.3 (PowerPC 604) system lately, but my scripts
> are set up to do so using
> 
>     --with-cpu=powerpc --disable-aix64 --disable-powercpu
> 
> in order to avoid this issue. Should I be able to drop any of these, at this
> point?

You can remove the --with-cpu; the default on AIX4.3 is 604e,
which should work fine.  I don't think you can yet remove the
--disable-powercpu since I didn't touch the multilib code (I
completely missed it, and wow it's a nice little maze all of
itself).  I have no idea about --disable-aix64.  Try and see :-)

[Bug bootstrap/53266] Error: Unrecognized opcode: `mulhwu'

[skunk at iskunk dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

--- Comment #6 from Daniel Richard G. <skunk at iskunk dot org> 2012-09-25 21:38:32 UTC ---
Okay, I'm bootstrapping an unmodified 4.7.2, using a previously-built 4.7.0 as
CC and the following configuration options:

    --prefix=/opt/tg
    --disable-dependency-tracking
    --disable-maintainer-mode
    --program-prefix=tg-
    --disable-shared
    --disable-nls
    --enable-languages=c,c++
    --enable-version-specific-runtime-libs
    --with-pic
    --with-mpc=/tg/freeport/arch/aix32
    --with-mpfr=/tg/freeport/arch/aix32
    --with-gmp=/tg/freeport/arch/aix32
    --disable-powercpu

Last time I tried this with 4.7.0/4.7.1, there were numerous problems (none
having to do with bad PPC instructions, since I just used --with-cpu= et al. to
work around that). I actually have patches for most of the issues, and have
previously posted them at

    http://gcc.gnu.org/PR53348#c7

but David Edelsohn took no notice of them. If you're interested, I'll be happy
to update the patch for current SVN.

At any rate, I'll let you know how the build goes. This machine isn't exactly a
speed demon, so give it a day or three....

[Bug bootstrap/53266] Error: Unrecognized opcode: `mulhwu'

[segher at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> 2012-09-26 05:49:09 UTC ---
Sorry, I didn't notice this was for 4.7 -- the removal of all
suport for the POWER ISA is only on mainline, and won't be
backported.  Could you test mainline instead?  All fixes happen
there (or happen there first).

[Bug bootstrap/53266] Error: Unrecognized opcode: `mulhwu'

[skunk at iskunk dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

--- Comment #8 from Daniel Richard G. <skunk at iskunk dot org> 2012-09-26 06:06:11 UTC ---
Sure, can do. Is mainline a synonym for SVN trunk? Is there somewhere I can
download a ready-made tarball, just to make sure everything is autogen'ed
correctly?

[Bug bootstrap/53266] Error: Unrecognized opcode: `mulhwu'

[segher at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

--- Comment #9 from Segher Boessenkool <segher at gcc dot gnu.org> 2012-09-26 06:43:41 UTC ---
Yes, mainline is SVN trunk.

There are weekly snapshots on http://gcc.gnu.org/snapshots.html (just
get the newest one, it should be more than new enough for this).

[Bug bootstrap/53266] Error: Unrecognized opcode: `mulhwu'

[skunk at iskunk dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

--- Comment #10 from Daniel Richard G. <skunk at iskunk dot org> 2012-09-27 14:02:03 UTC ---
Okay, I grabbed a copy of gcc-4.8-20120923, and started bootstrapping using an
older 4.5.2 (since the 4.7.0 C++ compiler isn't working correctly; am I correct
in observing that GCC can no longer be bootstrapped using just a C compiler?).

Things went well up until this point:

tg-g++ -c   -g -DIN_GCC   -fno-exceptions -fno-rtti -W -Wall -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings -fno-common  -DHAVE_CONFIG_H -I.
-I. -I/home/src/gcc-4.8-20120923/gcc -I/home/src/gcc-4.8-20120923/gcc/.
-I/home/src/gcc-4.8-20120923/gcc/../include
-I/home/src/gcc-4.8-20120923/gcc/../libcpp/include
-I/tg/freeport/arch/aix32/include -I/tg/freeport/arch/aix32/include
-I/tg/freeport/arch/aix32/include 
-I/home/src/gcc-4.8-20120923/gcc/../libdecnumber
-I/home/src/gcc-4.8-20120923/gcc/../libdecnumber/dpd -I../libdecnumber    \
        /home/src/gcc-4.8-20120923/gcc/config/rs6000/rs6000.c -o rs6000.o
/home/src/gcc-4.8-20120923/gcc/config/rs6000/rs6000.c: In function 'void
rs6000_code_end()':
/home/src/gcc-4.8-20120923/gcc/config/rs6000/rs6000.c:28292:51: error:
'ASM_WEAKEN_DECL' was not declared in this scope
gmake[3]: *** [rs6000.o] Error 1
gmake[3]: Leaving directory `/tmp/gcc-4.8-test/gcc'
gmake[2]: *** [all-stage1-gcc] Error 2
gmake[2]: Leaving directory `/tmp/gcc-4.8-test'
gmake[1]: *** [stage1-bubble] Error 2
gmake[1]: Leaving directory `/tmp/gcc-4.8-test'
gmake: *** [bootstrap-lean] Error 2


This is one of the issues addressed by my aforementioned patch.

[Bug bootstrap/53266] Error: Unrecognized opcode: `mulhwu'

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |WONTFIX
             Status|UNCONFIRMED                 |RESOLVED
   Target Milestone|---                         |7.0

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
AIX 4.3 is no longer supported since GCC 7.