Analysis tool that giving execution time

Are there any analyis tools (preferably open.source) that tell u time
of execution of a certain code or at least tell u the number of T
states that final binary will take. Maybe some assemblers generate this
info , however that seems very inconvenient isnt there some tool that
states simply and clearly number of T state. I want to quantify timing
advantages in the code that I write by choosing different coding
styles/algorithm etc.
I need a tool that tells me that this code shall take n T states or
similar info .
Any help?
thanks

.

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