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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 - The RegisterCoalescer don't propagate undef flag when removing IMPLICIT_DEF"
href="https://bugs.llvm.org/show_bug.cgi?id=38680">38680</a>
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<th>Summary</th>
<td>The RegisterCoalescer don't propagate undef flag when removing IMPLICIT_DEF
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Register Allocator
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>karl-johan.karlsson@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>Created <span class=""><a href="attachment.cgi?id=20760" name="attach_20760" title="llc -O0 -mtriple i686-- -o - ./registercoalescer_implicitdef.mir -run-pass=simple-register-coalescing">attachment 20760</a> <a href="attachment.cgi?id=20760&action=edit" title="llc -O0 -mtriple i686-- -o - ./registercoalescer_implicitdef.mir -run-pass=simple-register-coalescing">[details]</a></span>
llc -O0 -mtriple i686-- -o - ./registercoalescer_implicitdef.mir
-run-pass=simple-register-coalescing
$ llc -O0 -mtriple i686-- -o - ./registercoalescer_implicitdef.mir
-run-pass=simple-register-coalescing
# Machine code for function main: NoPHIs, TracksLiveness
bb.0:
%1:gr32 = ADD32ri8 %1:gr32, 1, implicit-def dead $eflags
CMP32ri8 %0:gr32, 42, implicit-def $eflags
# End machine code for function main.
*** Bad machine code: Reading virtual register without a def ***
- function: main
- basic block: %bb.0 (0x6d981f8)
- instruction: CMP32ri8 %0:gr32, 42, implicit-def $eflags
- operand 0: %0:gr32
LLVM ERROR: Found 1 machine code errors.</pre>
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