Re: [Qemu-devel] [PATCH 0/8] Improve TCG optimizer

[Peter Maydell]

On 6 September 2012 16:00, Aurelien Jarno <address@hidden> wrote:
> This patch series improves the TCG optimizer, based on patterns found
> while executing various guest. The brcond ad setcond constant folding
> are useful especially useful when they are used to avoid some argument
> values (e.g. division by 0), and thus can be optimized when this argument
> is a constant.
>
> This bring around 0.5% improvement on openssl like benchmarks.

This didn't overall seem to make much difference on my popular
embedded benchmark setup. However I am rapidly losing confidence
in the benchmark since from run to run individual tests can have
results which vary by a factor of two, which is such high
variation it's almost impossible to say whether a change has
had an overall +1% or -1% effect. Hohum.

-- PMM