http://llvm.org/bugs/show_bug.cgi?id=17473
Bug ID: 17473
Summary: possible wrong code bug
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Well this one is weird since fn2 isn't even called, but it can't be removed or
the bad behavior goes away.
[regehr@imp r104]$ clang -w -O0 small.c ; ./a.out
ffffffff
[regehr@imp r104]$ clang -w -O small.c ; ./a.out
ff
[regehr@imp r104]$ gcc -w -O small.c ; ./a.out
ffffffff
[regehr@imp r104]$ cat small.c
int printf(const char *, ...);
int a, c, d, e, f, g, i, j;
short b;
char h;
int fn1(void)
{
return b && a > b || b < 0 && a ?: b;
}
void fn2(void) {
for (;; f = fn1())
;
}
void fn3(int p1) {
j &&(c = 0 ?: 0);
g = p1;
}
int main(void) {
for (h = 0; h >= 0; ++h) {
fn3(h);
i = d >= 0 ?: 0;
}
e = g;
e += h;
printf("%x\n", e);
return 0;
}
[regehr@imp r104]$ clang -v
clang version 3.4 (trunk 191880)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.5.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
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