[llvm-bugs] [Bug 37755] New: Implement __shiftright128 for x86_64-pc-windows-msvc

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Fri Jun 8 19:03:03 PDT 2018


            Bug ID: 37755
           Summary: Implement __shiftright128 for x86_64-pc-windows-msvc
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sfinae at hotmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 20415
  --> https://bugs.llvm.org/attachment.cgi?id=20415&action=edit
Test case

This intrinsic makes https://github.com/ulfjack/ryu more efficient on x64

C:\Temp>type repro.cpp
#ifndef _M_X64
    #error This repro requires x64.

// https://docs.microsoft.com/en-us/cpp/intrinsics/shiftright128

#include <intrin.h>
#include <stdio.h>

int main() {
    const unsigned long long val = __shiftright128(0x0102030405060708ull,
0xA0B0C0D0E0F0AABBull, 20);

    if (val == 0x0AABB01020304050ull) {
    } else {
        printf("FAIL, this should be 0AABB01020304050: %016llX\n", val);

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

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

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