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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Bad machine code: Instruction ending live segment doesn't read the register"
href="https://bugs.llvm.org/show_bug.cgi?id=39440">39440</a>
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<th>Summary</th>
<td>Bad machine code: Instruction ending live segment doesn't read the register
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
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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
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Common Code Generator Code
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>francisvm@yahoo.com
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
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<pre>*** Bad machine code: Instruction ending live segment doesn't read the register
***
- function: fn
- basic block: %bb.5 if.then13 (0x7fcd6d80ada0) [720B;1056B)
- instruction: 992B %3:gr8 = COPY %9:gr8
- liverange:
[96r,128B:1)[128B,992r:0)[992r,1056B:3)[1056B,1136B:0)[1136B,1264B:6)[1328B,1776B:6)[1776B,1904r:8)[1920r,1968B:2)[1968B,2192r:5)[2400r,2448B:4)[3024r,3088B:7)
0@128B-phi 1@96r 2@1920r 3@992r 4@2400r 5@1968B-phi 6@1136B-phi 7@3024r
8@1776B-phi
- v. register: %3
- segment: [128B,992r:0)
LLVM ERROR: Found 1 machine code errors.
Seems to come after Simple Register Coalescing.
build/bin/llc -verify-machineinstrs test/CodeGen/X86/pr38795.ll -O2
-mtriple=i386-unknown-linux-gnu -o -</pre>
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