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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unsupported vector mode is passed incorrectly"
href="https://bugs.llvm.org/show_bug.cgi?id=39501">39501</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Unsupported vector mode is passed incorrectly
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>
<tr>
<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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hjl.tools@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>[hjl@gnu-cfl-1 tmp]$ cat x.c
typedef int __attribute__((mode(QI))) qi;
typedef qi __attribute__((vector_size (32))) v32qi;
v32qi foo (int x)
{
v32qi y = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f',
'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
return y;
}
[hjl@gnu-cfl-1 tmp]$ clang -mno-avx -S -O2 x.c
movaps .LCPI0_0(%rip), %xmm0 # xmm0 =
[48,49,50,51,52,53,54,55,56,57,97,98,99,100,101,102]
movaps %xmm0, %xmm1
retq
-mno-avx should pass v32qi as before AVX was enabled. For example,
[hjl@gnu-cfl-1 tmp]$ cat z.c
typedef int __attribute__((mode(SI))) si;
typedef si __attribute__((vector_size (128))) v;
v
foo (int x)
{
v y = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f',
'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
return y;
}
[hjl@gnu-cfl-1 tmp]$ clang -S -O2 z.c
...
movaps .LCPI0_0(%rip), %xmm0 # xmm0 = [99,100,101,102]
movaps %xmm0, 112(%rdi)
movaps .LCPI0_1(%rip), %xmm1 # xmm1 = [56,57,97,98]
movaps %xmm1, 96(%rdi)
movaps .LCPI0_2(%rip), %xmm2 # xmm2 = [52,53,54,55]
movaps %xmm2, 80(%rdi)
movaps .LCPI0_3(%rip), %xmm3 # xmm3 = [48,49,50,51]
movaps %xmm3, 64(%rdi)
movaps %xmm0, 48(%rdi)
movaps %xmm1, 32(%rdi)
movaps %xmm2, 16(%rdi)
movaps %xmm3, (%rdi)
movq %rdi, %rax
retq
If there were AVX1024, clang would have passed y in vector register. When
AVX1024 were disabled, clang would have passed y in memory and issued an
ABI change warning.</pre>
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