<html>
<head>
<base href="https://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 --- - ARM backend crash when compiling half-precision FP op without hardware FP"
href="https://llvm.org/bugs/show_bug.cgi?id=24549">24549</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>ARM backend crash when compiling half-precision FP op without hardware FP
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<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>Backend: ARM
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>oliver.stannard@arm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This IR causes the ARM backend to crash when it is compiled for a target that
does not have any floating-point hardware:
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "armv7--none-eabi"
define void @foo(half* %a, half* %b, half* %c) {
entry:
%d = load half, half* %a
%e = load half, half* %b
%f = fadd half %d, %e
store half %f, half* %c
ret void
}
This is the error I get (with a recent trunk build):
$ llc test.ll -mattr=-vfp2
LLVM ERROR: Unsupported library call operation!
LLVM is attempting to lower the half-precision fadd to a library call, but
there are no library calls for half-precision. it should probably promote the
value to float (as it does when f32 is legal but f16 is not), and then emit f32
library calls.</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>