[Bug binutils/16083] objdump provides wrong disassemble for MULSD instruction when used with an unusual combination of prefixes

[grigory.rechistov at phystech dot edu]

https://sourceware.org/bugzilla/show_bug.cgi?id=16083

Grigory Rechistov <grigory.rechistov at phystech dot edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |address@hidden
                   |                            |edu
            Summary|objdump provide wrond       |objdump provides wrong
                   |disassemble for mulsd       |disassemble for MULSD
                   |instruction.                |instruction when used with
                   |                            |an unusual combination of
                   |                            |prefixes

--- Comment #1 from Grigory Rechistov <grigory.rechistov at phystech dot edu> 
---
The problem is present not just for MULSD but for many x86 instructions that
are encoded with a mandatory prefix (e.g. 0xF2), but also are allowed to have
optional prefixes like 0x66 to be inserted between opcode and mandatory prefix.
Hardware does not pay attention to prefixes order.

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