[llvm-bugs] [Bug 30931] New: error: invalid instruction mnemonic 'movsl'

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30931

            Bug ID: 30931
           Summary: error: invalid instruction mnemonic 'movsl'
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: amine.khaldi at reactos.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

This was revealed by
https://github.com/reactos/reactos/blob/master/reactos/ntoskrnl/include/internal/i386/ke.h#L738
and then reduced to:

void foo(void)
{
    __asm rep movsd;
}

cl /c compiles it without errors, but clang-cl /c emits:

error: invalid instruction mnemonic 'movsl'
    __asm rep movsd;
    ^
<inline asm>(2,6):  note: instantiated into assembly here
        rep movsd
            ^~~~~
1 error generated.

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