[fpc-devel] Proposal/discussion: Simple nested functions and 'outlining'

J. Gareth Moreton gareth at moreton-family.com
Sat Oct 3 21:06:33 CEST 2020

Useful theory.  I'll take a read.  Thank you again.

Gareth aka. Kit

On 03/10/2020 19:14, Jonas Maebe via fpc-devel wrote:
> On 03/10/2020 18:43, J. Gareth Moreton via fpc-devel wrote:
>> Sounds like a fun thing to research, that's for sure.  Thanks Jonas.
>> I'm under the impression that exception code tends to be separated
>> anyway, so it can't easily be separated much further.
> Implicit exception code, yes, but explicit try/except blocks can appear
> anywhere.
>> Code that executes if, say, a LongInt variable equals "-1" might be cold
>> code, especially as that's often an error flag and is otherwise just one
>> value out of 2^32 possibilities (i.e. statistically unlikely to be
>> True), although it's tricky to know if an assumption is correct or not
>> given an arbitrary block of code, and what the penalty is if code that's
>> marked as cold is actually hot.
> There's a pretty famous paper that investigated what kind of checks
> often (in about 80% of the cases) result in taken/non-taken branches.
> You can find it at
> https://www.classes.cs.uchicago.edu/archive/2017/fall/32001-1/papers/ball-larus-branch-predict.pdf
> You will indeed get penalties from mispredictions, but you can be as
> conservative as you want.
> Jonas
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