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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
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Subject: Re: Not good for Ada endorsement
Date: Thu, 8 Jul 2021 13:12:29 +0200
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On 7/8/21 12:51 PM, Luke A. Guest wrote:
> 
> On 08/07/2021 11:42, Jeffrey R. Carter wrote:
> 
> Here's the playlist 
> https://youtube.com/playlist?list=PLF2KJ6Gy3cZ5Er-1eF9fN1Hgw_xkoD9V1 the second 
> video is where he sets up Python, C# and C++.
> 
>> Compiling the original code with
>>
>> gnatmake prime_sieve.adb
>>
>> gives 408 passes in 5 seconds.
>>
>> Making the changes listed above (I used Interfaces.Integer_32) and compiling with
>>
>> gnatmake -O3 prime_sieve.adb
>>
>> (to ensure that no checks fail) gives 2087 passes in 5 seconds, for a factor 
>> of 5.1.
> 
> He shows the C++ jumping from 4645 (https://youtu.be/D3h62rgewZM?t=1246) to 
> 7,436 (https://youtu.be/D3h62rgewZM?t=1306) passes going from 32 to 64 bit.
> 
> He also uses clang's -Ofast option to compile for speed over size.

Going back to 64-bit integers gives 1999; with -gnatp, 2098

-- 
Jeff Carter
"My legs are gray, my ears are gnarled, my eyes are old and bent."
Monty Python's Life of Brian
81