https://sourceware.org/bugzilla/show_bug.cgi?id=20838
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
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CC| |hjl.tools at gmail dot com
--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to James Michael DuPont from comment #5)
> Here are some invalid operations that are generated by objdump but cannot be
> compiled by as :
>
>
> # 44 63 0a movslq (%rdx),%r9d
> test20:
> .byte 68 # 44
> .byte 99 # 63
> .byte 10 # 0a
>
> compiling and dumping that produces :
>
> 0000000000000030 <test20>:
> 30: 44 63 0a movslq (%rdx),%r9d
>
> compiling the result :
> movslq (%rdx),%r9d
>
> Assembler messages:
> 1: Error: operand type mismatch for `movslq'
>
Without the REX_W prefix, 0x63 opcode behaves as mov. I don't see a strong
need to change it since it isn't the code generated by a compiler.
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