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