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<body><span class="vcard"><a class="email" href="mailto:changpeng.fang@amd.com" title="Changpeng Fang <changpeng.fang@amd.com>"> <span class="fn">Changpeng Fang</span></a>
</span> changed
<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - GVN incorrectly optimizes away a non-local load"
href="https://bugs.llvm.org/show_bug.cgi?id=45470">bug 45470</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>INVALID
</td>
<td>---
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>RESOLVED
</td>
<td>REOPENED
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - GVN incorrectly optimizes away a non-local load"
href="https://bugs.llvm.org/show_bug.cgi?id=45470#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - GVN incorrectly optimizes away a non-local load"
href="https://bugs.llvm.org/show_bug.cgi?id=45470">bug 45470</a>
from <span class="vcard"><a class="email" href="mailto:changpeng.fang@amd.com" title="Changpeng Fang <changpeng.fang@amd.com>"> <span class="fn">Changpeng Fang</span></a>
</span></b>
<pre>Thanks for looking into this. Right the reduced test does not reproduce the
issue. So I attached the original one extract.O1.ll:
We don't expect to see "chfang(float undef)" after
opt -O1 -gvn extraxt.O1.ll -S:
bb1355: ; preds = %bb1379, %bb1346
%tmp1356 = phi i32 [ 0, %bb1346 ], [ %tmp1383, %bb1379 ]
%tmp1357 = shl i32 %tmp1356, 2
%tmp1358 = getelementptr inbounds [16 x i16], [16 x i16] addrspace(5)* %tmp,
i32 0, i32 %tmp1357
store i16 11878, i16 addrspace(5)* %tmp1358, align 2, !tbaa !28
...
.loopexit: ; preds = %.preheader,
%.loopexit93
%tmp1394 = bitcast [16 x i16] addrspace(5)* %tmp to half addrspace(5)*
%tmp1395 = load half, half addrspace(5)* %tmp1394, align 2, !tbaa !18
%tmp1396 = fpext half %tmp1395 to float
call void @chfang(float %tmp1396)</pre>
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