http://llvm.org/bugs/show_bug.cgi?id=22613
Bug ID: 22613
Summary: wrong code at -O2 and -O3 on x86_64-linux-gnu
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The current clang trunk miscompiles the following code at -O2 and -O3 on
x86_64-linux-gnu in both 32-bit and 64-bit modes.
This is a regression from 3.5.0.
$ clang-trunk -v
clang version 3.7.0 (trunk 229360)
Target: x86_64-unknown-linux-gnu
Thread model: posix
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/4.8.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.2
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-trunk -Os small.c; ./a.out
$ clang-3.5.0 -O2 small.c; ./a.out
$
$ clang-trunk -O2 small.c
$ ./a.out
Aborted (core dumped)
$
-------------------------------
int a, b, c, d, e;
char f[1][3];
void
fn1 ()
{
for (d = 0; d < 2; d++)
{
f[b][d] = 0;
for (e = 0; e < 3; e++)
{
if (c)
a--;
f[0][e] = 1;
}
}
}
int
main ()
{
fn1 ();
if (f[0][1] != 1)
__builtin_abort ();
return 0;
}
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