http://llvm.org/bugs/show_bug.cgi?id=15714
Bug ID: 15714
Summary: clang hangs at -O3 on expression
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following snippet (generated by csmith) causes top-of-trunk clang to get
stuck in an infinite loop at -O3 (-O2 and below are fine, as is clang 3.2).
While it appears to invoke undefined behavior ((*d ^= 1 != (long)d)), hanging
is probably not the right thing to do.
$ clang-trunk -v
clang version 3.3 (trunk 179090)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ clang-trunk -O2 -c test.c
$ clang-trunk -O3 -c test.c
<hangs>
int a, b, c;
int fn2();
void fn1 ()
{
int *d, *e = &b;
d = &b;
*e = 0;
c = 0;
for (; c < 42; ++c)
{
(*d ^= 1 != (long)d) && fn2 ();
if (a)
break;
}
}
int fn2 ()
{
int *f = &b;
*f = 1;
return b;
}
void fn3 ()
{
fn1 ();
}
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