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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 - Implement __shiftright128 for x86_64-pc-windows-msvc"
href="https://bugs.llvm.org/show_bug.cgi?id=37755">37755</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Implement __shiftright128 for x86_64-pc-windows-msvc
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sfinae@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20415" name="attach_20415" title="Test case">attachment 20415</a> <a href="attachment.cgi?id=20415&action=edit" title="Test case">[details]</a></span>
Test case
This intrinsic makes <a href="https://github.com/ulfjack/ryu">https://github.com/ulfjack/ryu</a> more efficient on x64
Windows.
C:\Temp>type repro.cpp
#ifndef _M_X64
#error This repro requires x64.
#endif
// <a href="https://docs.microsoft.com/en-us/cpp/intrinsics/shiftright128">https://docs.microsoft.com/en-us/cpp/intrinsics/shiftright128</a>
#include <intrin.h>
#include <stdio.h>
int main() {
const unsigned long long val = __shiftright128(0x0102030405060708ull,
0xA0B0C0D0E0F0AABBull, 20);
if (val == 0x0AABB01020304050ull) {
puts("PASS");
} else {
printf("FAIL, this should be 0AABB01020304050: %016llX\n", val);
}
}
C:\Temp>cl
Microsoft (R) C/C++ Optimizing Compiler Version 19.15.26504 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
usage: cl [ option... ] filename... [ /link linkoption... ]
C:\Temp>cl /EHsc /nologo /W4 repro.cpp && repro
repro.cpp
PASS
C:\Temp>clang-cl -m64 -v
clang version 6.0.0 (tags/RELEASE_600/final)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: S:\msvc\src\vctools\NonShip\ClangLLVM\bin
C:\Temp>clang-cl -m64 /EHsc /nologo /W4 repro.cpp && repro
repro-128dd8.obj : error LNK2019: unresolved external symbol __shiftright128
referenced in function main
repro.exe : fatal error LNK1120: 1 unresolved externals
clang-cl.exe: error: linker command failed with exit code 1120 (use -v to see
invocation)</pre>
</div>
</p>
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