[Bug c/66062] New: under O2 optimization level , aarch64 compiler give informance : internal compiler error: in expand_assignment, at expr.c:4838

[Bug c/66062] New: under O2 optimization level , aarch64 compiler give informance : internal compiler error: in expand_assignment, at expr.c:4838

[huangcunjian at huawei dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66062

            Bug ID: 66062
           Summary: under O2 optimization level , aarch64 compiler give
                    informance  :  internal compiler error: in
                    expand_assignment, at expr.c:4838
           Product: gcc
           Version: 4.9.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: huangcunjian at huawei dot com
  Target Milestone: ---

Created attachment 35493
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35493&action=edit
testcase context

gcc version:
Target: aarch64-linux-gnu
Configured with:
/usr1/code/CODE_SDKV1R5C00/code/current/V1R5/build/script/cpu_hcc/p660/p660_build_dir/src/gcc-4.9/configure
--build=x86_64-suse-linux --host=x86_64-suse-linux --target=aarch64-linux-gnu
--with-arch=armv8-a
--prefix=/usr1/code/CODE_SDKV1R5C00/code/current/V1R5/build/script/cpu_hcc/p660/p660_build_dir/install
--disable-multilib --enable-__cxa_atexit --with-gnu-as --with-gnu-ld
--disable-libmudflap --disable-libgomp --disable-libssp --enable-threads
--enable-plugin --enable-c99 --enable-long-long --disable-nls --enable-shared
--enable-poison-system-directories --enable-symvers=gnu --with-pkgversion='SDK
V100R005C00B101' --enable-languages=c,c++

command:
aarch64-linux-gnu-gcc -w -O2 EMI_61144035_2_rd.i

compiler actual output :
./testsuite/gcc.target/hidsp/emi/20150428_151230_normal1/output/2015-4-29_6-46-13_17379704/EMI_61144035_2_rd.c:
In function 'func_1':
./testsuite/gcc.target/hidsp/emi/20150428_151230_normal1/output/2015-4-29_6-46-13_17379704/EMI_61144035_2_rd.c:747:56:
internal compiler error: in expand_assignment, at expr.c:4838
0x670942 expand_assignment(tree_node*, tree_node*, bool)
       
/usr1/code/CODE_SDKV1R5C00/code/current/V1R5/build/script/cpu_hcc/p660/p660_build_dir/src/gcc-4.9/gcc/expr.c:4838
0x5b4416 expand_gimple_stmt_1
       
/usr1/code/CODE_SDKV1R5C00/code/current/V1R5/build/script/cpu_hcc/p660/p660_build_dir/src/gcc-4.9/gcc/cfgexpand.c:3226
0x5b4a70 expand_gimple_stmt
       
/usr1/code/CODE_SDKV1R5C00/code/current/V1R5/build/script/cpu_hcc/p660/p660_build_dir/src/gcc-4.9/gcc/cfgexpand.c:3322
0x5b5588 expand_gimple_basic_block
       
/usr1/code/CODE_SDKV1R5C00/code/current/V1R5/build/script/cpu_hcc/p660/p660_build_dir/src/gcc-4.9/gcc/cfgexpand.c:5162
0x5b93b6 gimple_expand_cfg
       
/usr1/code/CODE_SDKV1R5C00/code/current/V1R5/build/script/cpu_hcc/p660/p660_build_dir/src/gcc-4.9/gcc/cfgexpand.c:5741
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.

[Bug target/66062] under O2 optimization level , aarch64 compiler give informance : internal compiler error: in expand_assignment, at expr.c:4838

[ssaraswati at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66062

Sujoy <ssaraswati at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ssaraswati at gmail dot com

--- Comment #1 from Sujoy <ssaraswati at gmail dot com> ---

(In reply to huangcunjian from comment #0)

Hi,
 I can reproduce this on x86_64 as well. The test case as such has an issue
that it does an out of bound access for an array. However, I believe gcc
shouldn't crash in any case. This can be reproduced with a shorter test case as
shown below. 

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>

struct S0 {
  unsigned int i : 2;
};

static struct S0 g[5] = {{0}, {1}, {0}, {1}, {0}};
static int64_t idx = 0x979516CD4BBA2AEDLL;

int main()
{
  struct S0 l = {0};
  g[(idx + 1)] = l;
  return g[3].i;
}

$ gcc -O2 small_test.c
small_test.c: In function âmainâ:
small_test.c:15:16: internal compiler error: in expand_assignment, at
expr.c:4721
   g[(idx + 1)] = l;
                ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.8/README.Bugs> for instructions.
Preprocessed source stored into /tmp/ccueDw3V.out file, please attach this to
your bugreport.
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Subject: [Bug target/66062] under O2 optimization level , aarch64 compiler give  informance  :  internal compiler error: in expand_assignment, at expr.c:4838
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf062

--- Comment #2 from Sujoy <ssaraswati at gmail dot com> ---
This bug is in UNCONFIRMED state. Since I am new to gcc, just wanted to know if
one should work for this fix only after it is confirmed.

[Bug target/66062] under O2 optimization level , aarch64 compiler give informance : internal compiler error: in expand_assignment, at expr.c:4838

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66062

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

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

--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
gcc-4.8 isn't supported anymore.
I cannot reproduce the issue with 4.9.3 or above.

[Bug target/66062] under O2 optimization level , aarch64 compiler give informance : internal compiler error: in expand_assignment, at expr.c:4838

[ssaraswati at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66062

--- Comment #4 from Sujoy <ssaraswati at gmail dot com> ---
(In reply to Markus Trippelsdorf from comment #3)
> gcc-4.8 isn't supported anymore.
> I cannot reproduce the issue with 4.9.3 or above.

Thanks for checking. Yes, looks like this got fixed with PR65680.

[Bug target/66062] under O2 optimization level , aarch64 compiler give informance : internal compiler error: in expand_assignment, at expr.c:4838

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66062

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

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

--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Closing.