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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Microblaze Backend Inline Assembler Fault"
href="http://llvm.org/bugs/show_bug.cgi?id=16692">16692</a>
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<th>Summary</th>
<td>Microblaze Backend Inline Assembler Fault
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>slugonamission@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The MBlaze asm printer does not work correctly when using input or output
constraints, causing llc to exit with the following error:
error: invalid operand in inline asm: 'add $0, r0, r0'
This is generated from lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp:400. It
appears to originate from "PrintAsmOperand()" in
lib/Target/MBlaze/MBlazeAsmPrinter.cpp.
Given the indentation of the switch statement within this function (and the
actual statements), it appears as it should belong to the outer-if statement
(if(ExtraCode && ExtraCode[0])), although there are no braces to support this.
Adding braces to add the switch statement to the outer if seems to fix the
problem, although I've not submitted this as a patch incase I've missed some
nuance of doing this.
A simple test case is as follows. Compile using "clang -S -emit-llvm -target
MBlaze test.c -o test.bc", then "llc -march=mblaze test.bc".
int main()
{
volatile int x = 5;
asm("add %0, r0, r0" : "=r"(x) : : "r5");
return 0;
}</pre>
</div>
</p>
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