Re: [Qemu-devel] [PATCH 06/18] tcg: allow globals to overlap

[Richard Henderson]

On 01/17/2017 01:07 AM, Kirill Batuzov wrote:
> Sometimes the target architecture may allow some parts of a register to be
> accessed as a different register. If both of these registers are
> implemented as globals in QEMU, then their content will overlap and the
> change to one global will also change the value of the other. To handle
> such situation properly, some fixes are needed in the register allocator
> and liveness analysis.

You need to handle the overlap during optimization as well.  Otherwise you'll 
propagate values that you shouldn't.


r~