[LLVMbugs] [Bug 10807] New: [x86 disassembler] vmaskmovpd is not disassembled

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10807

           Summary: [x86 disassembler] vmaskmovpd is not disassembled
           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. 3-612:

VEX.NDS.128.66.0F38.W0 2F /r
VMASKMOVPD m128, xmm1, xmm2

clang on OSX correctly assembles the following):

vmaskmovpd %xmm0, %xmm1, (%eax)

The object file shows:
C4 E2 71 2F 00 

But using llvm-mc built from trunk r138250, this byte sequence doesn't
disassemble:

$ echo '0xc4 0xe2 0x71 0x2f 0x00'| ./llvm-mc -disassemble -triple="x86_64"
<stdin>:1:1: warning: invalid instruction encoding
0xc4 0xe2 0x71 0x2f 0x00

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