https://bugs.llvm.org/show_bug.cgi?id=49429
Bug ID: 49429
Summary: [LLVM-COV] Execute once and return twice
Product: Runtime Libraries
Version: 11.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: libprofile library
Assignee: unassignedb...@nondot.org
Reporter: cnwy1...@outlook.com
CC: llvm-bugs@lists.llvm.org
$ clang -v
clang version 11.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/wangyang/llvm-project/build/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
$ cat test.c
union U {
int f0;
unsigned char f1;
};
int main() {
int i = 0;
union U u = {0};
for (u.f1 = 0; u.f1 != -2; ++u.f1) {
i ^= u.f1;
if (i < 1)
return 0;
}
return 1;
}
$ clang -w -O0 -g -fcoverage-mapping -fprofile-instr-generate=test.profraw
test.c; ./a.out; llvm-profdata merge test.profraw -o test.profdata; llvm-cov
show a.out -instr-profile=test.profdata test.c > test.lcov; cat test.lcov
1| |union U {
2| | int f0;
3| | unsigned char f1;
4| |};
5| |
6| 1|int main() {
7| 1| int i = 0;
8| 1| union U u = {0};
9| 1| for (u.f1 = 0; u.f1 != -2; ++u.f1) {
10| 1| i ^= u.f1;
11| 1| if (i < 1)
12| 1| return 0;
13| 1| }
14| 1| return 1;
15| 1|}
16| |
Line #14 should not be executed
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