[Bug gdb/23028] New: inconsistent disassemble of vcvtpd2dq

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23028

            Bug ID: 23028
           Summary: inconsistent disassemble of vcvtpd2dq
           Product: gdb
           Version: 8.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

[hjl@gnu-cfl-1 binutils]$ cat z.s
        .text
foo:
vcvtpd2dqx 0x20(%rax),%xmm0
vcvtpd2dq 0x20(%rax){1to2},%xmm0
vcvtpd2dqx 0x20(%rax),%xmm0
[hjl@gnu-cfl-1 binutils]$ gcc -c z.s
[hjl@gnu-cfl-1 binutils]$ gdb z.o
GNU gdb (GDB) Fedora 8.0.1-36.2.fc27
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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For help, type "help".
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Reading symbols from z.o...(no debugging symbols found)...done.
(gdb) disass foo
Dump of assembler code for function foo:
   0x0000000000000000 <+0>:     vcvtpd2dqx 0x20(%rax),%xmm0
   0x0000000000000005 <+5>:     vcvtpd2dq 0x20(%rax){1to2},%xmm0
   0x000000000000000c <+12>:    vcvtpd2dq 0x20(%rax),%xmm0
                                ^^^^^^^^^^ This should be vcvtpd2dqx.
End of assembler dump.
(gdb) 

[hjl@gnu-cfl-1 binutils]$ objdump -dw z.o

z.o:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <foo>:
   0:   c5 fb e6 40 20          vcvtpd2dqx 0x20(%rax),%xmm0
   5:   62 f1 ff 18 e6 40 04    vcvtpd2dq 0x20(%rax){1to2},%xmm0
   c:   c5 fb e6 40 20          vcvtpd2dqx 0x20(%rax),%xmm0
[hjl@gnu-cfl-1 binutils]$

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