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[Bug gas/17421] Internal error in output_insn during kernel build


From: hjl.tools at gmail dot com
Subject: [Bug gas/17421] Internal error in output_insn during kernel build
Date: Mon, 22 Sep 2014 15:37:26 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=17421

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hjl.tools at gmail dot com

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Mikael Pettersson from comment #4)
> Created attachment 7801 [details]
> reduced test case
> 
> Seems like .code16gcc and the "andn" instruction don't work together.
> 
> > cat bz17421.s
>         .code16gcc
>         .text
>         andn    req_flags(,%edx,4), %ecx, %ecx

According to Intel SDM, andn isn't supported in 16-bit mode. "gcc -m16"
should turn off MMX, SSE, AVX as well as VEX-encoded scalar instructions.

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