Bad access on CPP Solution3 with clang (macOS ARM64)

[hishnash]

When running the CPP Solution3 on my M1 Max I get bus error from playing around with the code it seems that I get this memory error as soon as I create a second instance of Sieve.

I can reproduce this by modifying the main function to create 2 Sieve instances rather than the single one.

My C++ skills are not great so I'm not confident I can find the issue alone however happy to follow and debuting hints you might have to help figure this out.

clang --version
Apple clang version 13.0.0 (clang-1300.0.29.3)
Target: arm64-apple-darwin21.1.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

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Incase your interested here are the numbers on the M1 Max for CPP solution 1 and 2.

Solution 1

Passes: 4805, Time: 5.000536, Avg: 0.001041, Limit: 1000000, Count1: 78498, Count2: 78498, Valid: 1

davepl_pol;4805;5.000536;1;algorithm=base,faithful=yes,bits=1

Solution 2

Primes Benchmark (c) 2021 Dave's Garage - http://github.com/davepl/primes
-------------------------------------------------------------------------
Computing primes to 10000000 on 10 threads for 5 seconds.
Passes: 3804, Threads: 10, Time: 5.00959, Average: 0.00131693, Limit: 10000000, Counts: 664579/664579, Valid : Pass

davepl_par;3804;5.00959;10;algorithm=base,faithful=yes,bits=1

[tjol]

Identifying the minimum change needed to tease out this error is a great start. What code exactly are you inserting to create a second Sieve instance, and where exactly are you inserting it? main() in PrimeCPP/solution_3/PrimeCPP_CONSTEXPR.cpp does not create any instances of Sieve.
https://github.com/PlummersSoftwareLLC/Primes/blob/drag-race/PrimeCPP/solution_3/PrimeCPP_CONSTEXPR.cpp#L154

Maybe that'd help somebody reproduce the error, or give somebody an idea where you might look next.

[hishnash]

Oh... I see the issue I had pulled the wrong version of this repo closing this issue (there seems to be another issue but its a compile time now so might be able to open PR with a fix)

[hishnash]

:)

it compiles and runs now

Computing primes to 1000000 on 10 threads for 5 seconds.
Passes: 1790593805, Time: 5.000191, Avg: 0.000000, Limit: 1000000, Count1: 78498, Count2: 78498, Valid: 1

flo80_pol_constexpr;1790593805;5.000191;10;algorithm=base,faithful=no,bits=1
Computing primes to 1000000 on 1 thread for 5 seconds.
Passes: 246709311, Time: 5.000061, Avg: 0.000000, Limit: 1000000, Count1: 78498, Count2: 78498, Valid: 1

flo80_pol_constexpr;246709311;5.000061;1;algorithm=base,faithful=no,bits=1

not bad numbers as well :)