[Bug binutils/24945] New: as/objdump accepting invalid default destination mask.

[hgreving at google dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24945

            Bug ID: 24945
           Summary: as/objdump accepting invalid default destination mask.
           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: ---

A %k0 default mask is not allowed for all scatter/gather instructions in
AVX-512. Looks like as/objdump accept it, for example:

cat test.s
        .byte 0x62
        .byte 0xf2
        .byte 0x7d
        .byte 0x08
        .byte 0x90
        .byte 0x04
        .byte 0x48

as test.s
objdump -d a.out 

a.out:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <.text>:
   0:   62 f2 7d 08 90 04 48    vpgatherdd (%rax,%xmm1,2),%xmm0

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