[fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

[Florian Klämpfl]

Am 27.10.2018 um 19:19 schrieb Michael Van Canneyt:
> 
> 
> On Sat, 27 Oct 2018, Florian Klämpfl wrote:
> 
>> If you read the whole thread, LLVM needs a rewritten exception handling as well. Further, a quick test
>> of table based exception handling on bansi1 (which is mainly a memory manager test) gives:
>>
>> standard exception handling:
>>
>> fpctrunk\tests\bench>pp11 bansi1 -O3
>>
>> fpctrunk\tests\bench>bansi1
>> Test 1: 1000000 done in 0.537 sec
>> Test 2: 1000000 done in 0.535 sec
>> Test 3: 1000000 done in 0.587 sec
>>
>> SEH based exception handling:
>>
>> fpctrunk\tests\bench>pp11 bansi1 -O3
>>
>> fpctrunk\tests\bench>bansi1
>> Test 1: 1000000 done in 0.456 sec
>> Test 2: 1000000 done in 0.457 sec
>> Test 3: 1000000 done in 0.446 sec
> 
> Florian, I am not sure what this is supposed to prove ?

That it is useful to work on table based exception handling for all targets ...

> 
> It's 15% off the elapsed time (almost 1/6th), that seems worth spending some time on...