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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - 16-bit and 32-bit immediates print as 64-bits in annotated assembly (x86-64)"
href="http://llvm.org/bugs/show_bug.cgi?id=20347">20347</a>
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<th>Summary</th>
<td>16-bit and 32-bit immediates print as 64-bits in annotated assembly (x86-64)
</td>
</tr>
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<th>Product</th>
<td>tools
</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>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>llc
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>spatel+llvm@rotateright.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>Using llc built from r213097:
$ cat imm.ll
define i8 @int8() #0 {
ret i8 -128
}
define i16 @int16() #0 {
ret i16 -32768
}
define i32 @int32() #0 {
ret i32 -2147483648
}
define i64 @int64() #0 {
ret i64 -9223372036854775808
}
---------------------------------------------------------------
$ ./llc imm.ll -o -
(irrelevant output removed)
movb $-128, %al
movw $-32768, %ax ## imm = 0xFFFFFFFFFFFF8000
movl $-2147483648, %eax ## imm = 0xFFFFFFFF80000000
movabsq $-9223372036854775808, %rax ## imm = 0x8000000000000000
---------------------------------------------------------------
It's good to show decimal immediates as hex values when reading asm, but it's
confusing to see known 16-bit and 32-bit values displayed as sign extended
64-bit hex.
Can we display immediates with the correct size? For completeness, shouldn't
the 8-bit value also be displayed in hex?
I think this is x86-specific because I don't see any attempt to print
immediates in hex when displaying ARM or PPC64 asm.</pre>
</div>
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