http://llvm.org/bugs/show_bug.cgi?id=15386
Bug ID: 15386
Summary: non-terminating loops with optimization causes clang
to hang
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 causes top-of-trunk clang to get stuck in an infinite
loop when compiled at -O1 or higher. This is likely related to 15384, but that
bug only triggers at -O3.
$ clang-trunk -v
clang version 3.3 (trunk 172630)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ cat loop.c
int a, b, c;
void f1 ()
{
for (; b; b++)
if (a)
a = 1;
for (b = 0; b != 1; b = b + (unsigned int) 2)
if (!a)
a = 0;
}
void f2 ()
{
for (;;);
}
void f3 ()
{
f2();
for (; c; c++)
f2();
f1();
}
int main ()
{
return 0;
}
$ clang-trunk -O1 loop.c
$ clang-trunk -Os loop.c
<hangs>
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