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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 --- - Instruction's optimization works wrong with vector code."
href="https://llvm.org/bugs/show_bug.cgi?id=24458">24458</a>
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<tr>
<th>Summary</th>
<td>Instruction's optimization works wrong with vector code.
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</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>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>opt
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>shishpanov2010@yandex.ru
</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>IR code with fail:
define <8 x i32> @_div__(<8 x float> %n) {
%notequal_b_load_.i = fcmp une <8 x float> %n, zeroinitializer
%equal_a_load72_.i = fcmp ueq <8 x float> %n, zeroinitializer
%notequal_b_load__to_boolvec.i = sext <8 x i1> %notequal_b_load_.i to <8 x
i32>
%equal_a_load72__to_boolvec.i = sext <8 x i1> %equal_a_load72_.i to <8 x i32>
%wrong = or <8 x i32> %notequal_b_load__to_boolvec.i,
%equal_a_load72__to_boolvec.i
ret <8 x i32> %wrong
}
Launch command: opt -instcombine -o /dev/null reduce.ll
I think the mistake is in lib/Transforms/InstCombine/InstCombineAndOrXor.cpp in
Value *getFCmpValue(bool isordered, unsigned code, Value *LHS, Value
*RHS, InstCombiner::BuilderTy *Builder). This function does not consider the
vector value. It returns i1 true, but I guess it should return vector of i1
true.</pre>
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