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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - The assembly parser eats trailing 'h' chars from macro arguments that start with a number"
href="https://bugs.llvm.org/show_bug.cgi?id=32973">32973</a>
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<th>Summary</th>
<td>The assembly parser eats trailing 'h' chars from macro arguments that start with a number
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>MC
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>martin@martin.st
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>When macro arguments start with a number, a 'h' after the number gets eaten
before the macro gets expanded.
E.g. this aarch64 snippet fails to assemble with clang/LLVM while it assembles
fine with gnu binutils:
.macro do_add sz
add v0.\sz, v0.\sz, v0.\sz
.endm
do_add 8h
With clang/llvm, this fails to assemble like this:
$ clang -target aarch64-linux-gnu -c test.s -o test.o
<instantiation>:1:9: error: invalid vector kind qualifier
add v0.8, v0.8, v0.8
^
test.s:5:1: note: while in macro instantiation
do_add 8h
^
If the same snippet is written differently, to include the dot in the macro
argument, it assembles fine:
.macro do_add sz
add v0\sz, v0\sz, v0\sz
.endm
do_add .8h
Likewise, the original do_add macro succeeds with other lane sizes like 4s, 8b,
16b etc.
The same phenomenon can be observed with this rather pathological test case:
.macro def_string param
.ascii "\param"
.endm
.data
def_string 1hello
When assembled, objdump shows:
$ aarch64-linux-gnu-objdump -s test.o
test.o: file format elf64-littleaarch64
Contents of section .data:
0000 31656c6c 6f 1ello
The 'h' trailing the number '1' has been eaten and never made it into the macro
expansion.</pre>
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