https://llvm.org/bugs/show_bug.cgi?id=28655
Bug ID: 28655
Summary: wrong code (SIGFPE) at -O3 on x86_64-linux-gnu (in
both 32-bit and 64-bit modes)
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: s...@cs.ucdavis.edu
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The following code is miscompiled by the current clang trunk at -O3 on
x86_64-linux-gnu in both the 32-bit and 64-bit modes.
This is a regression from 3.8.x.
$ clang -v
clang version 4.0.0 (trunk 276243)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.1.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ clang -O2 small.c; ./a.out
$ clang-3.8 -O3 small.c; ./a.out
$
$ clang -O3 small.c
$ ./a.out
Floating point exception (core dumped)
$
----------------------------------------------
int printf (const char *, ...);
int a, b, c, g = 11, h = 1, j, k;
static int e = 3, f;
int fn1 ()
{
int i = 0;
for (; i < 3; i++)
if (k)
printf ("%d %d %d\n", e, f, i);
f = 1;
return 0;
}
int fn2 (int p1)
{
a || fn1 ();
e = c || 1;
return p1;
}
int main ()
{
int l = a = 1;
for (; a; a--)
{
L1:
j = fn2 (l);
b = 2;
}
int n = 1 % (g & b) | 15;
if (h)
{
g = ~n;
if (1 < e)
goto L1;
}
l--;
return 0;
}
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