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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Failure to vectorize none-of 4xbyte"
href="https://bugs.llvm.org/show_bug.cgi?id=51591">51591</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Failure to vectorize none-of 4xbyte
</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>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lebedev.ri@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
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<pre><a href="https://godbolt.org/z/4WcY9aW5r">https://godbolt.org/z/4WcY9aW5r</a>
<a href="https://alive2.llvm.org/ce/z/RgJ439">https://alive2.llvm.org/ce/z/RgJ439</a>
We need to either/or do a better job of canonicalizing this in instcombine,
or teach SLPVectorizer about this.
SLP: Analyzing blocks in _Z3fooPKh.
SLP: bundle: %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1
SLP: initialize schedule region to %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1
SLP: extend schedule region end to %cmp.i.i59.i.i.i.i = icmp eq i64 %3,
65280
SLP: extend schedule region end to %cmp.i.i60.i.i.i.i = icmp eq i64 %4,
16711680
SLP: extend schedule region end to %cmp.i.i61.i.i.i.i = icmp eq i64 %5,
4278190080
SLP: try schedule bundle [ %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1;
%cmp.i.i59.i.i.i.i = icmp eq i64 %3, 65280; %cmp.i.i60.i.i.i.i = icmp eq i64
%4, 16711680; %cmp.i.i61.i.i.i.i = icmp eq i64 %5, 4278190080] in block entry
SLP: update deps of [ %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1;
%cmp.i.i59.i.i.i.i = icmp eq i64 %3, 65280; %cmp.i.i60.i.i.i.i = icmp eq i64
%4, 16711680; %cmp.i.i61.i.i.i.i = icmp eq i64 %5, 4278190080]
SLP: update deps of / %cmp.i.i59.i.i.i.i = icmp eq i64 %3, 65280
SLP: update deps of / %cmp.i.i60.i.i.i.i = icmp eq i64 %4, 16711680
SLP: update deps of / %cmp.i.i61.i.i.i.i = icmp eq i64 %5, 4278190080
SLP: update deps of %or.cond27 = select i1 %or.cond, i1 true, i1
%cmp.i.i60.i.i.i.i
SLP: gets ready on update: %or.cond27 = select i1 %or.cond, i1 true, i1
%cmp.i.i60.i.i.i.i
SLP: update deps of %or.cond = or i1 %cmp.i.i.i.i.i.i,
%cmp.i.i59.i.i.i.i
SLP: schedule %or.cond27 = select i1 %or.cond, i1 true, i1
%cmp.i.i60.i.i.i.i
SLP: gets ready (def): %or.cond = or i1 %cmp.i.i.i.i.i.i,
%cmp.i.i59.i.i.i.i
SLP: schedule %or.cond = or i1 %cmp.i.i.i.i.i.i, %cmp.i.i59.i.i.i.i
SLP: gets ready (def): [ %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1;
%cmp.i.i59.i.i.i.i = icmp eq i64 %3, 65280; %cmp.i.i60.i.i.i.i = icmp eq i64
%4, 16711680; %cmp.i.i61.i.i.i.i = icmp eq i64 %5, 4278190080]
SLP: We are able to schedule this bundle.
SLP: cancel scheduling of [ %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1;
%cmp.i.i59.i.i.i.i = icmp eq i64 %3, 65280; %cmp.i.i60.i.i.i.i = icmp eq i64
%4, 16711680; %cmp.i.i61.i.i.i.i = icmp eq i64 %5, 4278190080]
SLP: Gathering cmp with different predicate.
SLP: Check whether the tree with height 1 is fully vectorizable .
SLP: Trying to vectorize a list of length = 2.
SLP: Analyzing 2 operations
SLP: bundle: %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1
SLP: initialize schedule region to %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1
SLP: extend schedule region end to %cmp.i.i59.i.i.i.i = icmp eq i64 %3,
65280
SLP: try schedule bundle [ %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1;
%cmp.i.i59.i.i.i.i = icmp eq i64 %3, 65280] in block entry
SLP: update deps of [ %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1;
%cmp.i.i59.i.i.i.i = icmp eq i64 %3, 65280]
SLP: update deps of / %cmp.i.i59.i.i.i.i = icmp eq i64 %3, 65280
SLP: gets ready on update: %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1
SLP: We are able to schedule this bundle.
SLP: cancel scheduling of [ %cmp.i.i.i.i.i.i = icmp eq i8 %2, -1;
%cmp.i.i59.i.i.i.i = icmp eq i64 %3, 65280]
SLP: Gathering cmp with different predicate.
SLP: Check whether the tree with height 1 is fully vectorizable .</pre>
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