[PATCH v3 02/11] [x86] Add basic support for .code16

[David Woodhouse]

On Fri, 2013-12-20 at 14:57 +0000, David Woodhouse wrote:
>  def Mode64Bit : SubtargetFeature<"64bit-mode", "In64BitMode", "true",
>                                    "64-bit mode (x86_64)">;
> +def Mode16Bit : SubtargetFeature<"16bit-mode", "In16BitMode", "true",
> +                                  "16-bit mode (i8086)">;

You can consider the above to be a kind of enum using the two bits.
Setting them to {1,0} means 64-bit mode, {0,0} means 32-bit mode and
{0,1} means 16-bit mode. {1,1} is invalid.

Since we can't easily do a "proper" enum in the feature bits, Jörg
requested that we simply have separate bits for each of 16-bit, 32-bit
and 64-bit mode. Which looks something like this...

-- 
dwmw2

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