[LLVMbugs] [Bug 10831] New: [x86 disassembler] vmovapd disassembled incorrectly

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10831

           Summary: [x86 disassembler] vmovapd disassembled incorrectly
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: kkhoo at perfwizard.com
                CC: llvmbugs at cs.uiuc.edu


>From the "Intel® 64 and IA-32 Architectures Software Developer’s Manual
Volume 2 (2A & 2B): Instruction Set Reference, A-Z", p. 3-656:

VEX.128.66.0F.WIG 28 /r
VMOVAPD xmm1, xmm2/m128

Clang on OSX assembles the following:
vmovapd %xmm0, %xmm2

to these bytes:
C5 F9 28 D0 

But using llvm-mc built from trunk r138250, this byte sequence doesn't
disassemble as expected:
$ echo '0xc5 0xf9 0x28 0xd0'| ./llvm-mc -disassemble -triple="x86_64"
        movaps  %xmm0, %xmm2

The 3-byte VEX prefix form is also incorrect:
$ echo '0xc4 0xc1 0xf9 0x28 0xd0'| ./llvm-mc -disassemble -triple="x86_64"
        movaps  %xmm8, %xmm2

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