[PATCH v2 2/3] ARM: iwmmxt: Port problematic iwmmxt support code to v7/Thumb-2

[Nicolas Pitre]

On Thu, 8 Sep 2011, Eric Miao wrote:

> So the problem is really when compiling this file with existing toolchain,
> it's downgrading to v5 compatible mode, and the instruction below
> 
> sub pc, lr, r1, lsr #32
> 
> wouldn't be encoded when building a THUMB2 kernel. Considering the
> r1, lsr #32 is actually to create an explicit data dependency of the previous
> co-processor instruction, would it be one option to rewrite this as something
> like:
> 
> mov r1, r1
> mov pc, lr

That is certainly a pretty simple, obvious and straight forward way to 
deal with this issue.  I think I like this even more.


Nicolas