[Bug c/85567] New: internal compiler error: in gimplify_modify_expr, at gimplify.c:5797 when using sincos()

Sun Apr 29 08:43:00 GMT 2018

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85567

            Bug ID: 85567
           Summary: internal compiler error: in gimplify_modify_expr, at
                    gimplify.c:5797 when using sincos()
           Product: gcc
           Version: 8.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: generic.dummy@t-online.de
  Target Milestone: ---

Created attachment 44036
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44036&action=edit
preprocessed file

Compiler fails with an internal compiler error in gimplify_modify_expr when
using the builtin sincos() function.

Error is reproducible with gcc 8.0.1, 7.3.0 and 7.2.0 with -O2 optimization,
but is not triggered with reduced optimization (-O1) or applying std flags,
e.g. -std=c18.

Example is stripped down to the bare minimum still triggering the compiler
error.

# command line
gcc -c -O2 bug.c

# compiler output with gcc version 8.0.1 20180414 (experimental) [trunk
revision 259383] (Debian 8-20180414-1)
during GIMPLE pass: einline
bug.c: In function ‘apply_sincos’:
bug.c:11:2: internal compiler error: in gimplify_modify_expr, at
gimplify.c:5797
  f(x, sinx, cosx);
  ^~~~~~~~~~~~~~~~
0x5858ef gimplify_modify_expr
        ../../src/gcc/gimplify.c:5796
0x81fc29 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../src/gcc/gimplify.c:11434
0x8223f6 gimplify_stmt(tree_node**, gimple**)
        ../../src/gcc/gimplify.c:6658
0x824128 gimplify_and_add(tree_node*, gimple**)
        ../../src/gcc/gimplify.c:441
0x824128 internal_get_tmp_var
        ../../src/gcc/gimplify.c:597
0x82153c get_initialized_tmp_var(tree_node*, gimple**, gimple**, bool)
        ../../src/gcc/gimplify.c:628
0x82153c gimplify_save_expr
        ../../src/gcc/gimplify.c:5931
0x82153c gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../src/gcc/gimplify.c:11734
0x81f515 gimplify_compound_lval
        ../../src/gcc/gimplify.c:2965
0x81f515 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../src/gcc/gimplify.c:11386
0x829853 gimplify_modify_expr
        ../../src/gcc/gimplify.c:5625
0x81fc29 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../src/gcc/gimplify.c:11434
0x8223f6 gimplify_stmt(tree_node**, gimple**)
        ../../src/gcc/gimplify.c:6658
0x822afb gimplify_compound_expr
        ../../src/gcc/gimplify.c:5885
0x81fc57 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../src/gcc/gimplify.c:11424
0x8223f6 gimplify_stmt(tree_node**, gimple**)
        ../../src/gcc/gimplify.c:6658
0x822442 gimplify_and_add(tree_node*, gimple**)
        ../../src/gcc/gimplify.c:441
0x7f6f3c gimplify_and_update_call_from_tree(gimple_stmt_iterator*, tree_node*)
        ../../src/gcc/gimple-fold.c:551
0x7ff4b6 gimple_fold_builtin
        ../../src/gcc/gimple-fold.c:3784
0x801f74 gimple_fold_call
        ../../src/gcc/gimple-fold.c:4150
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-8/README.Bugs> for instructions.

# compiler output with gcc version 7.3.0 (Debian 7.3.0-16)
bug.c: In function ‘apply_sincos’:
bug.c:11:2: internal compiler error: in gimplify_modify_expr, at
gimplify.c:5645
  f(x, sinx, cosx);
  ^~~~~~~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.

# gcc-8 -v
Using built-in specs.
COLLECT_GCC=gcc-8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 8-20180414-1'
--with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --with-as=/usr/bin/x86_64-linux-gnu-as
--with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-8
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 8.0.1 20180414 (experimental) [trunk revision 259383] (Debian
8-20180414-1) 

# gcc-7 -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 7.3.0-16'
--with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --with-as=/usr/bin/x86_64-linux-gnu-as
--with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-7
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 7.3.0 (Debian 7.3.0-16)