Re: [Qemu-devel] [PATCH v2 3/4] tcg: Mask shift counts to avoid undefined behavior

[Richard Henderson]

On 03/18/2014 11:21 PM, Stefan Weil wrote:
> Are there test cases which fail with the old code?

Only when running under analysis tools looking for technical violations of the
standard.  Under normal circumstances it would never crash since, as with the
native backends, the underlying cpu is going to treat this some rational way.

But I sincerely doubt that we could measure any performance loss in TCI.  The
single extra arithmetic operation should be swallowed by the loop back to
interpret the next opcode.


r~