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List: llvm-bugs
Subject: [LLVMbugs] [Bug 20494] New: wrong code at -O2 and -O3 on x86_64-linux-gnu (only in 64-bit mode and a
From: bugzilla-daemon () llvm ! org
Date: 2014-07-30 19:58:44
Message-ID: bug-20494-206 () http ! llvm ! org/bugs/
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--1406750325.03273641.10675
Date: Wed, 30 Jul 2014 14:58:45 -0500
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http://llvm.org/bugs/show_bug.cgi?id=20494
Bug ID: 20494
Summary: wrong code at -O2 and -O3 on x86_64-linux-gnu (only in
64-bit mode and affecting all clang versions)
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangbugs@nondot.org
Reporter: su@cs.ucdavis.edu
CC: llvmbugs@cs.uiuc.edu
Classification: Unclassified
The current clang trunk miscompiles the following code at -O2 and -O3 on
x86_64-linux-gnu in 64-bit mode (but not in 32-bit mode).
This also affects earlier clang versions (including at least 3.0 and later).
$ clang-trunk -v
clang version 3.6.0 (trunk 214258)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
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/4.8.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$
$ clang-trunk -m64 -Os small.c; a.out
2
$ clang-trunk -m32 -O2 small.c; a.out
2
$
$ clang-trunk -m64 -O2 small.c; a.out
-2147483647
$ clang-3.4 -m64 -O2 small.c; a.out
-2147483647
$ clang-3.3 -m64 -O2 small.c; a.out
-2147483647
$
---------------------------------
int printf (const char *, ...);
int a, h;
volatile int c;
short b, g[2];
char d, e;
long f;
int
fn1 (unsigned int p)
{
int i;
for (i = 0; i < 1; i++)
for (e = 1; e; e++)
{
d = p % 3;
c;
}
return p;
}
int
main ()
{
for (h = 0; h < 2; h++)
g[h] = -8;
f = a && 1;
b = fn1 (g[0] ^ f);
printf ("%d\n", d);
return 0;
}
--
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--1406750325.03273641.10675
Date: Wed, 30 Jul 2014 14:58:45 -0500
MIME-Version: 1.0
Content-Type: text/html; charset="UTF-8"
<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - wrong code at -O2 and -O3 on x86_64-linux-gnu (only in 64-bit \
mode and affecting all clang versions)" \
href="http://llvm.org/bugs/show_bug.cgi?id=20494">20494</a> </td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code at -O2 and -O3 on x86_64-linux-gnu (only in 64-bit mode and \
affecting all clang versions) </td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>su@cs.ucdavis.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The current clang trunk miscompiles the following code at -O2 and -O3 on
x86_64-linux-gnu in 64-bit mode (but not in 32-bit mode).
This also affects earlier clang versions (including at least 3.0 and later).
$ clang-trunk -v
clang version 3.6.0 (trunk 214258)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
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/4.8.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$
$ clang-trunk -m64 -Os small.c; a.out
2
$ clang-trunk -m32 -O2 small.c; a.out
2
$
$ clang-trunk -m64 -O2 small.c; a.out
-2147483647
$ clang-3.4 -m64 -O2 small.c; a.out
-2147483647
$ clang-3.3 -m64 -O2 small.c; a.out
-2147483647
$
---------------------------------
int printf (const char *, ...);
int a, h;
volatile int c;
short b, g[2];
char d, e;
long f;
int
fn1 (unsigned int p)
{
int i;
for (i = 0; i < 1; i++)
for (e = 1; e; e++)
{
d = p % 3;
c;
}
return p;
}
int
main ()
{
for (h = 0; h < 2; h++)
g[h] = -8;
f = a && 1;
b = fn1 (g[0] ^ f);
printf ("%d\n", d);
return 0;
}</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>
--1406750325.03273641.10675--
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