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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 --- - test-suite/MultiSource/Benchmarks/mediabench/jpeg/jpeg-6a/cjpeg.execution_time fails for KNL target starting from r289653"
href="https://llvm.org/bugs/show_bug.cgi?id=31515">31515</a>
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<th>Summary</th>
<td>test-suite/MultiSource/Benchmarks/mediabench/jpeg/jpeg-6a/cjpeg.execution_time fails for KNL target starting from r289653
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>elad2.cohen@intel.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
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<pre>test-suite/MultiSource/Benchmarks/mediabench/jpeg/jpeg-6a/cjpeg.execution_time
fails for KNL target.
I ran a 'git bisect' and pinned down commit 289653.
A diff on the test artifacts after and before the commit shows the following
changes in MultiSource/Benchmarks/mediabench/jpeg/jpeg-6a/jcdctmgr.s:
before:
vpandn %ymm0, %ymm1, %ymm0
after:
.LCPI2_0:
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
...
vmovdqa .LCPI2_0(%rip), %ymm9 # ymm9 = [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
...
vpxor %ymm9, %ymm1, %ymm1
vpand %ymm0, %ymm1, %ymm0
Looks like r289653 creates a XOR with [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
instead of "allones" in this specific case.
I'm working on uploading a fix.</pre>
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