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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - x86 assembly could be improved for expression x+9*y where x,y are int8_t" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24052&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=0yup6hLZE7dRUQvdxkTnG8HoZNN8GEuUkYgSyhnfTAw&s=uF1Y-dTbboTZ5GzMCokhfkNcVGulYIs4-NnAhvRhGdc&e=">24052</a>
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<th>Summary</th>
<td>x86 assembly could be improved for expression x+9*y where x,y are int8_t
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>3.6
</td>
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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
</td>
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>calixte.denizet@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>The following C code:
int8_t foo(int8_t x, int8_t y)
{
return x + 9 * y;
}
generates this assembly with clang:
movb $9, %cl
movb %sil, %al
mulb %cl
addb %al, %dil
movsbl %dil, %eax
and generates this one with gcc:
leal (%rsi,%rsi,8), %esi
leal (%rsi,%rdi), %eax
For information it is ok when args are int32_t.</pre>
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