http://llvm.org/bugs/show_bug.cgi?id=16523
Bug ID: 16523
Summary: wrong code (SIGFPE) at -O3 on x86_64-linux-gnu (both
32-bit and 64-bit modes)
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following code is miscompiled by the current clang trunk (as well as clang
3.2 and 3.3) on x86_64-linux-gnu at -O3 in both 32-bit and 64-bit modes,
resulting in a SIGFPE.
$ clang-trunk -v
clang version 3.4 (trunk 185306)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ clang-trunk -O2 reduced.c
$ a.out
$ clang-trunk -O3 reduced.c
$ a.out
Floating point exception (core dumped)
$ clang-3.3 -O3 reduced.c
$ a.out
Floating point exception (core dumped)
$ clang-3.2 -O3 reduced.c
$ a.out
Floating point exception (core dumped)
$
---------------------------------------
unsigned int a;
int b, e, f, g;
struct
{
char x;
int y;
} **c, d;
int main ()
{
d.x = 1;
for (; e <= 0; e++)
if (!d.x) {
*c = 0;
g = b ? 0 : a / b;
f = g * e;
}
return 0;
}
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