https://llvm.org/bugs/show_bug.cgi?id=25033
Bug ID: 25033
Summary: wrong code at -O3 on x86_64-linux-gnu
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 on
x86_64-linux-gnu at -O2 and -O3 in 32-bit mode (but not in 64-bit mode).
This is a regression from 3.7.x.
It seems different from PR 24991, which disappears with -g enabled.
$ clang-trunk -v
clang version 3.8.0 (trunk 249170)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.2
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.1.0
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/4.8.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.1.0
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-trunk -m64 -O2 small.c; ./a.out
$ clang-trunk -m32 -Os small.c; ./a.out
$ clang-3.7.0 -m32 -O2 small.c; ./a.out
$
$ clang-trunk -m32 -O2 small.c
$ ./a.out
Aborted (core dumped)
$ clang-trunk -m32 -O2 -g small.c
$ ./a.out
Aborted (core dumped)
$
--------------------------------
int a, b, c, e, f, g, h;
char d;
int
main ()
{
f = 0;
h = d > 0;
c = g;
e--;
a = b <= 0;
e && (g = 0);
g--;
d ^= 1;
if (d != 1)
__builtin_abort ();
return 0;
}
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