https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85332
Bug ID: 85332 Summary: [GCOV] wrong coverage with do-while in swith-case statement Product: gcc Version: 8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: gcov-profile Assignee: unassigned at gcc dot gnu.org Reporter: yangyibiao at nju dot edu.cn CC: marxin at gcc dot gnu.org Target Milestone: --- $ gcc -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='Ubuntu 7.2.0-8ubuntu3' --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 --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 7.2.0 (Ubuntu 7.2.0-8ubuntu3) $ cat small.c int doit(int sel, int n, void *p) { int * const p0 = p; switch (sel) { case 0: do {*p0 += *p0;} while (--n); return *p0 == 0; default: abort (); } } int main() { int v0; v0 = 1; doit(0, 3, &v0); exit (0); } $ gcc -w --coverage small.c; ./a.out; gcov-8 small.c; cat small.c.gcov File 'small.c' Lines executed:81.82% of 11 Creating 'small.c.gcov' -: 0:Source:small.c -: 0:Graph:small.gcno -: 0:Data:small.gcda -: 0:Runs:1 -: 0:Programs:1 1: 1:int doit(int sel, int n, void *p) -: 2:{ 1: 3: int * const p0 = p; -: 4: 1: 5: switch (sel) -: 6: { 2: 7: case 0: 3: 8: do {*p0 += *p0;} while (--n); 1: 9: return *p0 == 0; -: 10: #####: 11: default: #####: 12: abort (); -: 13: } -: 14:} -: 15: 1: 16:int main() -: 17:{ -: 18: int v0; 1: 19: v0 = 1; doit(0, 3, &v0); 1: 20: exit (0); -: 21:} *** Line #7 is wrongly marked as executed twice.