[Bug bootstrap/65664] New: ARM bootstrap fails with --with-fpu=neon-vfpv4

[Bug bootstrap/65664] New: ARM bootstrap fails with --with-fpu=neon-vfpv4

[lukacs at topgroups dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65664

            Bug ID: 65664
           Summary: ARM bootstrap fails with --with-fpu=neon-vfpv4
           Product: gcc
           Version: 4.8.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: lukacs at topgroups dot ca
              Host: arm-slackware-linux-gnueabi
            Target: arm-slackware-linux-gnueabi
             Build: arm-slackware-linux-gnueabi

Created attachment 35219
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35219&action=edit
Compilation logs

configuration parameters include:

--with-cpu=cortex-a7 --with-tune=cortex-a7 --with-arch=armv7-a
--with-float=softfp  --with-fpu=neon-vfpv4 --disable-werror

and produces:

/bin/sh ./libtool  --tag=CC   --mode=compile
/home/woland/tmp/build-gcc/gcc.build.lnx/./gcc/xgcc
-B/home/woland/tmp/build-gcc/gcc.build.lnx/./gcc/
-B/usr/arm-slackware-linux-gnueabi/bin/ -B/usr/arm-slackware-linux-gnueabi/lib/
-isystem  /usr/arm-slackware-linux-gnueabi/include -isystem
/usr/arm-slackware-linux-gnueabi/sys-include    -DHAVE_CONFIG_H -I.
-I../../../gcc-4.8.4/libgo  -I ../../../gcc-4.8.4/libgo/runtime
-I../../../gcc-4.8.4/libgo/../libffi/include -I../libffi/include -pthread 
-fexceptions -fplan9-extensions  -Wall -Wextra -Wwrite-strings -Wcast-qual  
-D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I
../../../gcc-4.8.4/libgo/../libgcc -I ../../../gcc-4.8.4/libgo/../libbacktrace
-I ../../gcc/include -g -O2 -march=armv7-a -mtune=cortex-a7 -mfloat-abi=softfp
-MT go-type-complex.lo -MD -MP -MF .deps/go-type-complex.Tpo -c -o
go-type-complex.lo `test -f 'runtime/go-type-complex.c' || echo
'../../../gcc-4.8.4/libgo/'`runtime/go-type-complex.c
libtool: compile:  /home/woland/tmp/build-gcc/gcc.build.lnx/./gcc/xgcc
-B/home/woland/tmp/build-gcc/gcc.build.lnx/./gcc/
-B/usr/arm-slackware-linux-gnueabi/bin/ -B/usr/arm-slackware-linux-gnueabi/lib/
-isystem /usr/arm-slackware-linux-gnueabi/include -isystem
/usr/arm-slackware-linux-gnueabi/sys-include -DHAVE_CONFIG_H -I.
-I../../../gcc-4.8.4/libgo -I ../../../gcc-4.8.4/libgo/runtime
-I../../../gcc-4.8.4/libgo/../libffi/include -I../libffi/include -pthread
-fexceptions -fplan9-extensions -Wall -Wextra -Wwrite-strings -Wcast-qual
-D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I
../../../gcc-4.8.4/libgo/../libgcc -I ../../../gcc-4.8.4/libgo/../libbacktrace
-I ../../gcc/include -g -O2 -march=armv7-a -mtune=cortex-a7 -mfloat-abi=softfp
-MT go-type-complex.lo -MD -MP -MF .deps/go-type-complex.Tpo -c
../../../gcc-4.8.4/libgo/runtime/go-type-complex.c  -fPIC -DPIC -o
.libs/go-type-complex.o
../../../gcc-4.8.4/libgo/runtime/go-type-complex.c: In function
'__go_type_hash_complex':
../../../gcc-4.8.4/libgo/runtime/go-type-complex.c:87:1: error: unrecognizable
insn:
 }
 ^
(insn 99 98 100 17 (set (reg:DI 175 [ D.9567 ])
        (unspec:DI [
                (mem/c:DI (plus:SI (reg/f:SI 105 virtual-stack-vars)
                        (const_int -24 [0xffffffffffffffe8])) [6  S8 A32])
            ] UNSPEC_MISALIGNED_ACCESS))
../../../gcc-4.8.4/libgo/runtime/go-type-complex.c:51 -1
     (nil))
../../../gcc-4.8.4/libgo/runtime/go-type-complex.c:87:1: internal compiler
error: in extract_insn, at recog.c:2154
0x38cb63 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../gcc-4.8.4/gcc/rtl-error.c:109
0x38cbb7 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        ../../gcc-4.8.4/gcc/rtl-error.c:117
0x35f1af extract_insn(rtx_def*)
        ../../gcc-4.8.4/gcc/recog.c:2154
0x2611e7 instantiate_virtual_regs_in_insn
        ../../gcc-4.8.4/gcc/function.c:1565
0x2611e7 instantiate_virtual_regs
        ../../gcc-4.8.4/gcc/function.c:1932
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.
make[4]: *** [go-type-complex.lo] Error 1
make[4]: Leaving directory
`/home/woland/tmp/build-gcc/gcc.build.lnx/arm-slackware-linux-gnueabi/libgo'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory
`/home/woland/tmp/build-gcc/gcc.build.lnx/arm-slackware-linux-gnueabi/libgo'
make[2]: *** [all] Error 2
make[2]: Leaving directory
`/home/woland/tmp/build-gcc/gcc.build.lnx/arm-slackware-linux-gnueabi/libgo'
make[1]: *** [all-target-libgo] Error 2
make[1]: Leaving directory `/home/woland/tmp/build-gcc/gcc.build.lnx'
make: *** [bootstrap] Error 2

If --with-fpu=neon-vfpv4 is removed, then it compiles fine.

[Bug bootstrap/65664] ARM bootstrap fails with --with-fpu=neon-vfpv4

[lukacs at topgroups dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65664

--- Comment #1 from Gabor Lukacs <lukacs at topgroups dot ca> ---
Created attachment 35220
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35220&action=edit
Preprocessed source

[Bug bootstrap/65664] ARM bootstrap fails with --with-fpu=neon-vfpv4

[lukacs at topgroups dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65664

--- Comment #2 from Gabor Lukacs <lukacs at topgroups dot ca> ---
If 

--with-fpu=neon-vfpv4

is replaced with 

--with-fpu=vfpv4 

then bootstrap works fine.

[Bug bootstrap/65664] ARM bootstrap fails with --with-fpu=neon-vfpv4

[wilson at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65664

Jim Wilson <wilson at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-05-07
                 CC|                            |wilson at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #3 from Jim Wilson <wilson at gcc dot gnu.org> ---
I was able to reproduce this with an armhf cross compiler, compiling the
testcase with -O -mfpu=neon-vfpv4.  It is not broken in gcc-4.9.2.  It was
fixed by this patch
    https://gcc.gnu.org/ml/gcc-patches/2014-02/msg01595.html
which has this ChangeLog entry

2014-03-03  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

        * config/arm/neon.md (*movmisalign<mode>): Legitimize addresses
        not handled by recognizers.

I don't know offhand if this is worth backporting to gcc-4.8.x.

[Bug bootstrap/65664] ARM bootstrap fails with --with-fpu=neon-vfpv4

[lukacs at topgroups dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65664

--- Comment #4 from Gabor Lukacs <lukacs at topgroups dot ca> ---
The following patch makes the problem go away insofar as bootstrap is
concerned:

http://gcc.gnu.org/ml/gcc-patches/2014-05/msg02510.html

"This patch to libgo, from Peter Collingbourne, changes some of the C
code to make it easier to compile libgo with a compiler other than GCC."

[Bug bootstrap/65664] ARM bootstrap fails with --with-fpu=neon-vfpv4

[ramana at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65664

Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |ramana at gcc dot gnu.org
         Resolution|---                         |FIXED
   Target Milestone|---                         |4.9.0

--- Comment #5 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
Fixed in 4.9.0 then.