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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang 3.4 hangs in SymbolTableListTraits::transferNodesFromList() w/ -Os"
href="http://llvm.org/bugs/show_bug.cgi?id=19391">19391</a>
</td>
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<tr>
<th>Summary</th>
<td>clang 3.4 hangs in SymbolTableListTraits::transferNodesFromList() w/ -Os
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.4
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</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>asolokha@gmx.com
</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>clang 3.4 on x86_64-pc-linux-gnu hangs when compiling the following test case
w/ -Os:
static int
bv(void)
{
static int zv = 1;
int wf = 1;
h3:
for (zv = 0; zv < 1; ++zv)
if (0 != wf)
goto h3;
return 0;
}
static void
sj(int d2)
{
int ol;
int fo;
int *rf = &fo;
volatile int *as = &fo;
for (d2 = 0; d2 < 2; ++d2)
*as = 0;
for (ol = 15; ol != 2; ol -= 3U)
if (ol != (0 == *rf)) {
static int st;
for (st = 0; st < 1; ++st)
;
}
}
void
u1(void)
{
sj(bv());
}
It seems that the endless loop occurs in
llvm::SymbolTableListTraits<llvm::Instruction,
llvm::BasicBlock>::transferNodesFromList(llvm::ilist_traits<llvm::Instruction>&,
llvm::ilist_iterator<llvm::Instruction>,
llvm::ilist_iterator<llvm::Instruction>).
W/ the following change to the test case compilation takes a few seconds but
eventually ends successfully:
static void
sj(int d2)
{
- int ol;
+ short int ol;
int fo;
int *rf = &fo;
volatile int *as = &fo;
for (d2 = 0; d2 < 2; ++d2)
*as = 0;
- for (ol = 15; ol != 2; ol -= 3U)
+ for (ol = 15; ol != 2; ol -= 3)
if (ol != (0 == *rf)) {
static int st;
for (st = 0; st < 1; ++st)</pre>
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