http://llvm.org/bugs/show_bug.cgi?id=16729
Bug ID: 16729
Summary: wrong code (SIGFPE) on x86_64-linux-gnu (both 32-bit
and 64-bit modes)
Product: clang
Version: unspecified
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
3.3) on x86_64-linux-gnu at -O3 (also at -O2 for clang trunk) in both 32-bit
and 64-bit modes, resulting in a SIGFPE. This is a regression from clang 3.2.
$ clang-trunk -v
clang version 3.4 (trunk 187322)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ clang-trunk -O2 small.c
$ a.out
Floating point exception (core dumped)
$ clang-trunk -O3 small.c
$ a.out
Floating point exception (core dumped)
$ clang-3.3 -O3 small.c
$ a.out
Floating point exception (core dumped)
$ clang-3.2 -O3 small.c
$ a.out
0
$
----------------------------------------------------
int printf (const char *, ...);
unsigned int *a[1], *c, **const d = &a[0];
int b, e, f;
int main ()
{
int g;
unsigned int **h = &c;
for (; f < 8; ++f)
{
e = h == d;
g = e == 0 ? 0 : 1 / e;
b |= g;
}
printf ("%d\n", 0);
return 0;
}
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