https://llvm.org/bugs/show_bug.cgi?id=30710
Bug ID: 30710
Summary: wrong code at -O1 and above 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
$ clang -v
clang version 4.0.0 (trunk 284302)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
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/4.8.4
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
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 -O0 -w small.c; ./a.out
$ clang-3.8 -O1 -w small.c; ./a.out
$
$ clang -O1 -w small.c
$ ./a.out
Illegal instruction (core dumped)
$
-------------------------------------------
static int *b;
int a, **c = &b, **e = &b, *f[2], g = 1;
char d;
void fn1 ()
{
int *i = 0;
(&b == &f[1]) > a;
for (; d < 1; d++)
{
*c = &g;
if (*b)
return;
}
*i = 0;
}
void fn2 ()
{
int k = 0;
*e = &k;
fn1 ();
}
int main ()
{
fn2 ();
return 0;
}
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