<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 - [AArch64] bad codegen for bitwise logic on vector of i1"
href="https://bugs.llvm.org/show_bug.cgi?id=34290">34290</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[AArch64] bad codegen for bitwise logic on vector of i1
</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>All
</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: AArch64
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>spatel+llvm@rotateright.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Taking this from:
<a href="https://reviews.llvm.org/D36213">https://reviews.llvm.org/D36213</a>
...which will canonicalize IR to the 2nd form and potentially exacerbate the
existing problem.
define <2 x i64> @test7(<4 x float> %a, <4 x float> %b) {
%cmp = fcmp ult <4 x float> %a, zeroinitializer
%cmp4 = fcmp ult <4 x float> %b, zeroinitializer
%sext = sext <4 x i1> %cmp to <4 x i32>
%sext5 = sext <4 x i1> %cmp4 to <4 x i32>
%and = and <4 x i32> %sext, %sext5
%conv = bitcast <4 x i32> %and to <2 x i64>
ret <2 x i64> %conv
}
define <2 x i64> @test7_better_IR(<4 x float> %a, <4 x float> %b) {
%cmp = fcmp ult <4 x float> %a, zeroinitializer
%cmp4 = fcmp ult <4 x float> %b, zeroinitializer
%and1 = and <4 x i1> %cmp, %cmp4
%and = sext <4 x i1> %and1 to <4 x i32>
%conv = bitcast <4 x i32> %and to <2 x i64>
ret <2 x i64> %conv
}
$ ./llc -o - vcmp.ll -mtriple=aarch64
test7:
fcmge v0.4s, v0.4s, #0.0
mvn v0.16b, v0.16b
fcmge v1.4s, v1.4s, #0.0
bic v0.16b, v0.16b, v1.16b
ret
test7_better_IR:
fcmge v0.4s, v0.4s, #0.0
fcmge v1.4s, v1.4s, #0.0
mvn v0.16b, v0.16b
mvn v1.16b, v1.16b
xtn v0.4h, v0.4s
xtn v1.4h, v1.4s
and v0.8b, v0.8b, v1.8b
ushll v0.4s, v0.4h, #0
shl v0.4s, v0.4s, #31
sshr v0.4s, v0.4s, #31
ret</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>