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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion failed: IndexReg.getReg() != X86::ESP && IndexReg.getReg() != X86::RSP && "Cannot use ESP as index reg!""
href="https://bugs.llvm.org/show_bug.cgi?id=37892">37892</a>
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<th>Summary</th>
<td>Assertion failed: IndexReg.getReg() != X86::ESP && IndexReg.getReg() != X86::RSP && "Cannot use ESP as index reg!"
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>greg.bedwell@sony.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Found with a tool we've been using to randomly permute x86 assembly for
llvm-mca testing. In this case the assembly it's generated is invalid but the
compiler is asserting rather than erroring.
$ clang.exe --version
clang version 7.0.0 (trunk 335220) (llvm/trunk 335219)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: e:\work\upstream-llvm\build-vs2015-native-ninja\bin
$ cat 1.s
leaq (%rax,%rsp), %rax
$ gcc -c 1.s
1.s: Assembler messages:
1.s:1: Error: `(%rax,%rsp)' is not a valid base/index expression
$ clang.exe -c 1.s
Assertion failed: IndexReg.getReg() != X86::ESP && IndexReg.getReg() !=
X86::RSP && "Cannot use ESP as index reg!", file
E:\work\upstream-llvm\llvm\lib\Target\X86\MCTargetDesc\X86MCCodeEmitter.cpp,
line 561</pre>
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