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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - use lvx instead of lxvd2x and xxswapd when address is assumed to be aligned"
href="https://llvm.org/bugs/show_bug.cgi?id=30730">30730</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>use lvx instead of lxvd2x and xxswapd when address is assumed to be aligned
</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: PowerPC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>echristo@gmail.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>Power9 has a little endian load here that it can use for unaligned addresses,
but for power8 this is still important.
---
#include <altivec.h>
struct S {
vector int v;
vector int f() const;
};
vector int S::f() const {
return v;
}
---
AltiVec code:
.text
.abiversion 2
.file "aligned_load.cc"
.globl _ZNK1S1fEv
.p2align 4
.type _ZNK1S1fEv,@function
_ZNK1S1fEv: # @_ZNK1S1fEv
.Lfunc_begin0:
# BB#0:
lvx 2, 0, 3
blr
.long 0
.quad 0
.Lfunc_end0:
.size _ZNK1S1fEv, .Lfunc_end0-.Lfunc_begin0
---
VSX code
.text
.abiversion 2
.file "aligned_load.cc"
.globl _ZNK1S1fEv
.p2align 4
.type _ZNK1S1fEv,@function
_ZNK1S1fEv: # @_ZNK1S1fEv
.Lfunc_begin0:
# BB#0:
lxvd2x 0, 0, 3
xxswapd 34, 0
# kill: %V2<def> %V2<kill> %VSH2<kill>
blr
.long 0
.quad 0
.Lfunc_end0:
.size _ZNK1S1fEv, .Lfunc_end0-.Lfunc_begin0</pre>
</div>
</p>
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