[Bug binutils/31219] New: Incorrect disassembly for x86 ADCX instructions with -M suffix

[maratek at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31219

            Bug ID: 31219
           Summary: Incorrect disassembly for x86 ADCX instructions with
                    -M suffix
           Product: binutils
           Version: 2.41
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: maratek at gmail dot com
  Target Milestone: ---

adcxl is disassembled into adcxw when objdump disassembler is invoked with -M
suffix option.

$ cat > test.s << EOF
> .text
> adcxl %ecx, %edx
> EOF
$ as -o test.o test.s
$ objdump -M suffix -j .text -d test.o

test.o:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <.text>:
   0:   66 0f 38 f6 d1          adcxw  %ecx,%edx

This probably happens because ADCX instruction has a mandatory 0x66 prefix
which is interpreted as an operand size override prefix.

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