<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 - Missed loop vectorization with conditional store"
href="https://bugs.llvm.org/show_bug.cgi?id=48045">48045</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missed loop vectorization with conditional store
</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>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, pengfei.wang@intel.com, spatel+llvm@rotateright.com
</td>
</tr></table>
<p>
<div>
<pre>#define N 1024
float a[N], b[N], d[N];
void
foo (float *__restrict p, float *__restrict q)
{
int i;
for (i = 0; i < N; i++)
d[i] = a[i] < b[i] ? p[i] : q[i];
}
Clang does not vectorize it due to AVX 2 cost model.
ICC and GCC vectorizes it with AVX2. GCC even with AVX.
<a href="https://godbolt.org/z/WjKdjf">https://godbolt.org/z/WjKdjf</a></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>