[Bug binutils/18738] New: Wrong memory operand size for x86 GATHER/SCATTER instructions

[m at rolle dot name]

https://sourceware.org/bugzilla/show_bug.cgi?id=18738

            Bug ID: 18738
           Summary: Wrong memory operand size for x86 GATHER/SCATTER
                    instructions
           Product: binutils
           Version: 2.24
            Status: NEW
          Severity: minor
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: m at rolle dot name
  Target Milestone: ---

objdump disassembles gather/scatter instructions showing the vector operand
size as the memory operand size.  However, the Intel doc says it is the element
size.

In these examples:

   0:   62 22 7d 41 93 74 b9    vgatherqps ymm30{k1},YMMWORD PTR
[rcx+zmm31*4+0x100]
   7:   40
   8:   62 22 7d 41 a3 74 b9    vscatterqps YMMWORD PTR
[rcx+zmm31*4+0x100]{k1},ymm30
   f:   40

YMMWORD PTR should be DWORD PTR.

(objdump did get the disp*N compression right, converting a 40h displacement
byte into a 0x100 displacement.)

See also bug 18737 for similar problem with gas assembler.

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