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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang crashes on valid code at -O2 and -O3 on x86_64-linux-gnu in 32-bit mode"
href="http://llvm.org/bugs/show_bug.cgi?id=19721">19721</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code at -O2 and -O3 on x86_64-linux-gnu in 32-bit mode
</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 crashes when compiling the following code at -O2 and
-O3 on x86_64-linux-gnu in 32-bit (but not 64-bit) mode.
This is a regression from clang 3.4.
$ clang-trunk -v
clang version 3.5.0 (trunk 208493)
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 -m32 -Os -c small.c
$ clang-3.4 -m32 -O2 -c small.c
$ clang-trunk -m64 -O2 -c small.c
$
$ clang-trunk -m32 -O2 -c small.c
fatal error: error in backend: Cannot select: 0x3a50650: v4i32 =
X86ISD::INSERTPS 0x3a50860, 0x3a50860, 0x3a78ad8
[ORD=4] [ID=5]
0x3a50860: v4i32,ch = CopyFromReg 0x39fdd10, 0x3a50230 [ORD=2] [ID=4]
0x3a50230: v4i32 = Register %vreg0 [ID=1]
0x3a50860: v4i32,ch = CopyFromReg 0x39fdd10, 0x3a50230 [ORD=2] [ID=4]
0x3a50230: v4i32 = Register %vreg0 [ID=1]
0x3a78ad8: i32 = Constant<81> [ID=3]
In function: fn2
clang: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 3.5.0 (trunk 208493)
Target: i386-unknown-linux-gnu
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
clang: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/small-b9eaee.c
clang: note: diagnostic msg: /tmp/small-b9eaee.sh
clang: note: diagnostic msg:
********************
$
--------------------------------
struct S
{
int f0;
int f1;
};
volatile struct S a, b;
int c, d;
void
fn1 ()
{
int e[4];
for (c = 0; c < 4; c++)
e[c] = 1;
for (; b.f0;)
if (a.f1)
e[0] = 0;
d = e[0];
}
void
fn2 ()
{
fn1 ();
}</pre>
</div>
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