<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 - Invalid lowering of llvm.*.f128 intrinsics"
href="https://bugs.llvm.org/show_bug.cgi?id=45399">45399</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Invalid lowering of llvm.*.f128 intrinsics
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>clement.courbet@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>llvm.sin.f128 is incorrectly lowered to a call to sinl, which takes a f80:
<a href="https://godbolt.org/z/M9fjLW">https://godbolt.org/z/M9fjLW</a>
```
define fp128 @bad_lowering(fp128 %a) {
%s = call fp128 @llvm.sin.f128(fp128 %a)
ret fp128 %s
}
```
generates:
```
bad_lowering:
jmp sinl
```
which is missing conversions from and to x86_fp80.
I expect a correct lowering to be:
```
define fp128 @manual_correct_lowering(fp128 %a) {
%t = fptrunc fp128 %a to x86_fp80
%s = call x86_fp80 @llvm.sin.f80(x86_fp80 %t)
%e = fpext x86_fp80 %s to fp128
ret fp128 %e
}
```
```
manual_correct_lowering:
subq $24, %rsp
callq __trunctfxf2
fstpt (%rsp)
callq sinl
fstpt (%rsp)
callq __extendxftf2
addq $24, %rsp
retq
```</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>