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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Disabling code generation optimizations results in wrong inline assembly syntax selection"
href="https://bugs.llvm.org/show_bug.cgi?id=43575">43575</a>
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<th>Summary</th>
<td>Disabling code generation optimizations results in wrong inline assembly syntax selection
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>9.0
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>moritz.maxeiner@gmail.com
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22632" name="attach_22632" title="Minimal C example reproducing the error">attachment 22632</a> <a href="attachment.cgi?id=22632&action=edit" title="Minimal C example reproducing the error">[details]</a></span>
Minimal C example reproducing the error
On x86_64 Linux with LLVM 9 LLVM IR like
test.ll
=======
define void @exit(i32 %status)"
{
call void asm sideeffect inteldialect "mov rax, 60; syscall", ""()
ret void
}
$ llc test.ll -o test.o -filetype=obj -O=0
fails with
<inline asm>:1:2: error: unknown use of instruction mnemonic without a size
suffix
mov rax, 60; syscall
^
, whereas
$ llc test.ll -o test.o -filetype=obj -O=1
works fine. This seems wrong to me, as correct selection of the inline assembly
syntax shouldn't be influenced by the code optimization level. I've also
attached a minimal C example showcasing the error.</pre>
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