Re: [DynInst_API:] Accessing Packed Floats

[John Detter <jdetter@xxxxxxxx>]

Blair,

You should be able to do this using Dyninst. Could I see the code you're trying to use for this analysis?

-- John

On 09/27/2016 04:52 AM, Blair Archibald wrote:

Hi everyone,

I'm looking to do some analysis on (AVX) vectorised values stored in XMM/YMM. Is it possible to access the individual packed floats within these registers?

I've tried using BPatch_registerExpr to get the register I care about but I'm stuck trying to access the values. I thought something like *(regVal + 1) might work to get the second float but I've had no luck so far.

As an aside: I don't think YMM is configured correctly in the registerSpace and I had to manually add it to initialise64().

Any ideas if this is possible/how to do it?

Many thanks,

Blair

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