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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Verifier failure with ARMParallelDSP"
href="https://bugs.llvm.org/show_bug.cgi?id=42729">42729</a>
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<tr>
<th>Summary</th>
<td>Verifier failure with ARMParallelDSP
</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>Windows NT
</td>
</tr>
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<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>Backend: ARM
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>efriedma@quicinc.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, peter.smith@linaro.org, sam.parker@arm.com, sjoerd.meijer@arm.com, Ties.Stuij@arm.com
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<pre>Reproduce with "opt -arm-parallel-dsp reduced.ll -S"; produces:
Instruction does not dominate all uses!
%uglygep1213 = bitcast i8* %uglygep12 to i16*
%scevgep14 = getelementptr i16, i16* %uglygep1213, i32 6
in function f
LLVM ERROR: Broken function found, compilation aborted!
This is causing failures on the polly-aosp bot
(<a href="http://lab.llvm.org:8011/builders/aosp-O3-polly-before-vectorizer-unprofitable">http://lab.llvm.org:8011/builders/aosp-O3-polly-before-vectorizer-unprofitable</a>).
Testcase follows:
target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "thumbv7-unknown-linux-android"
define void @f(i16* %a) {
entry:
%incdec.ptr21 = getelementptr inbounds i16, i16* %a, i32 3
%incdec.ptr29 = getelementptr inbounds i16, i16* %a, i32 4
br label %for.body
for.body:
%0 = load i16, i16* %incdec.ptr21, align 2
%conv25 = sext i16 %0 to i32
%uglygep15 = getelementptr i8, i8* undef, i32 undef
%uglygep1516 = bitcast i8* %uglygep15 to i16*
%scevgep17 = getelementptr i16, i16* %uglygep1516, i32 7
%1 = load i16, i16* %scevgep17, align 2
%conv31 = sext i16 %1 to i32
%2 = load i16, i16* %incdec.ptr29, align 2
%conv33 = sext i16 %2 to i32
%uglygep12 = getelementptr i8, i8* undef, i32 undef
%uglygep1213 = bitcast i8* %uglygep12 to i16*
%scevgep14 = getelementptr i16, i16* %uglygep1213, i32 6
%3 = load i16, i16* %scevgep14, align 2
%conv39 = sext i16 %3 to i32
%mul.i287.neg.neg = mul nsw i32 %conv31, %conv25
%mul.i283.neg.neg = mul nsw i32 %conv39, %conv33
%reass.add408 = add i32 undef, %mul.i287.neg.neg
%reass.add409 = add i32 %reass.add408, %mul.i283.neg.neg
br label %for.body
}</pre>
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