<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [MS] Crush when calling intrinsic __cpuid"
href="https://bugs.llvm.org/show_bug.cgi?id=50133">50133</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[MS] Crush when calling intrinsic __cpuid
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</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>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>pengfei.wang@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, pengfei.wang@intel.com, spatel+llvm@rotateright.com
</td>
</tr></table>
<p>
<div>
<pre>Small reproducer:
#include <array>
#include <vector>
#include <intrin.h>
struct A {
std::string S;
std::vector<std::array<int, 4>> V;
A() {
std::array<int, 4> B;
__cpuid(B.data(), 0);
V.push_back(B);
V.push_back(B);
char C[64];
memset(C, 0, sizeof(C));
S = C;
}
} T;
Commands:
clang-cl -mavx2 /EHs repro.cpp -S
cat repro.asm | grep cpuid -A7
cpuid
#NO_APP
mov r11d, eax
mov rax, qword ptr [rbx + 72] # 8-byte Reload
mov r10d, ebx
mov r9d, ecx
mov rcx, qword ptr [rbx + 80] # 8-byte Reload
mov r8d, edx</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>