<html>
<head>
<base href="https://bugs.llvm.org/">
</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 - Error when compiling large `if` blocks on riscv64-linux-gnu"
href="https://bugs.llvm.org/show_bug.cgi?id=44366">44366</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Error when compiling large `if` blocks on riscv64-linux-gnu
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>9.0
</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>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>adrien.sf.wu@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>When compiling a program to riscv64-linux-gnu target with large "if" blocks
(which compiles to at least 2^19 bytes of code to make the jump an indirect
branch), clang gives the following error:
error in backend: Unable to insert indirect branch
It seems like a issue on PIE generation, since compiling with --target=riscv64
is successful.
The following is an example source:
int a(int c) {
if (c < 12345) {
#define A \
{ int d = c % 12345; int e = c ^ d * 12345; \
int f = c * d % e % 12345; c = f; }
#define B A A A A A A
#define C B B B B B B
#define D C C C C C C
#define E D D D D D D
E E E E E
}
return c;
}
One can reproduce the error by compiling the source with
clang -O0 --target=riscv64-linux-gnu -c</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>