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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 --- - Integrated assembler complains moveq is deprecated"
href="https://llvm.org/bugs/show_bug.cgi?id=31885">31885</a>
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</tr>
<tr>
<th>Summary</th>
<td>Integrated assembler complains moveq is deprecated
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: ARM
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>manojgupta@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>MOV and MVN are in the list of supported IT blocks instructions for ARM
(<a href="http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0802b/Cjabicci.html">http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0802b/Cjabicci.html</a>).
However, integrated assembler complains about it.
Minimal repro case:
"""
void test() {
int __res;
__asm__(
"it eq\n"
"moveq %0,%1\n"
: "=r" (__res)
: "i"(-22));
}
"""
clang --target=arm-linux-gnueabihf -march=armv8-a -mthumb -c inline_test.c
inline_test.c:5:8: warning: deprecated instruction in IT block [-Winline-asm]
"moveq %0,%1\n"
^
<inline asm>:2:1: note: instantiated into assembly here
moveq r0,#-22
Interestingly, the actual generated code does not use MOV but rather uses MVN
instead. So it could be the case of MVN instruction incorrectly classified as
unsupported in IT blocks.
- Generated code
.code 16 @ @test
.thumb_func
test:
.fnstart
@ BB#0:
.pad #4
sub sp, #4
@APP
it eq
mvneq r0, #21</pre>
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