[Bug gcov-profile/85201] [GCOV] A statement with two && operators and a comma operator in the for loop body is wrongly marked in gcov

[yangyibiao at nju dot edu.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85201

--- Comment #1 from Yibiao Yang <yangyibiao at nju dot edu.cn> ---
(In reply to Yibiao Yang from comment #0)
> $ gcc -v 
> gcc -v
> Using built-in specs.
> COLLECT_GCC=gcc
> 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='Ubuntu
> 8-20170923-1ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
> --enable-languages=c,c++,go,brig,fortran,objc,obj-c++ --prefix=/usr
> --with-gcc-major-version-only --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 --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
> --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
> --target=x86_64-linux-gnu
> Thread model: posix
> gcc version 8.0.0 20170923 (experimental) [trunk revision 253118] (Ubuntu
> 8-20170923-1ubuntu2)
> 
> $ cat small.c
> void main() {
>   int a = 0;
>   int b = 0;
>   int c = 0;
>   for (; a >= 0; a--) {
>     (c && b, 1) && b;
>   }
> }
> 
> $ gcc -w --coverage small.c; ./a.out; gcov-8 small.c; cat small.c.gcov
> File 'small.c'
> Lines executed:100.00% of 7
> Creating 'small.c.gcov'
> 
>         -:    0:Source:small.c
>         -:    0:Graph:small.gcno
>         -:    0:Data:small.gcda
>         -:    0:Runs:1
>         -:    0:Programs:1
>         1:    1:void main() {
>         1:    2:  int a = 0;
>         1:    3:  int b = 0;
>         1:    4:  int c = 0;
>         2:    5:  for (; a >= 0; a--) {
>         2:    6:    (c && b, 1) && b;

I am not sure this is a duplication of bug 85163. When changing the operators
in the code of bug 85163, the result is correct. While  changing '&&' to '||'
of the code here, the problem is still exist. 

>         -:    7:  }
>         1:    8:}
> 
> 
> Line #6 is wrongly marked as executed twice.