[Bug binutils/24691] New: gas/objdump fail to reject invalid vshuff*/vshufi* encodings.

[hgreving at google dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24691

            Bug ID: 24691
           Summary: gas/objdump fail to reject invalid vshuff*/vshufi*
                    encodings.
           Product: binutils
           Version: 2.32
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: hgreving at google dot com
  Target Milestone: ---

lvm-mc-7 seems to handle it correctly:

e.g.

echo "0x62 0xf3 0x75 0x08 0x23 0xc2 0x25" | /usr/bin/llvm-mc-7 -disassemble
-triple=x86_64

        .text
<stdin>:1:1: warning: invalid instruction encoding
0x62 0xf3 0x75 0x08 0x23 0xc2 0x25
^
<stdin>:1:26: warning: invalid instruction encoding
0x62 0xf3 0x75 0x08 0x23 0xc2 0x25
                         ^
<stdin>:1:31: warning: invalid instruction encoding
0x62 0xf3 0x75 0x08 0x23 0xc2 0x25
                              ^
Should be (e.g. from binutils)

objdump -d test | grep shuf
 5fe:   62 f3 75 08 23 c2 25    vshuff32x4 $0x25,%xmm2,%xmm1,%xmm0

According to Intel's Spec., either EVEX.L or .L' needs to be set.

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