boost::mt19937 usage

[rovinski]

DPL uses boost::mt19937:

OpenROAD/src/dpl/src/util/utility.h

Line 14 in 182f51b

using Placer_RNG = boost::mt19937;

and so does PPL:

OpenROAD/src/ppl/src/SimulatedAnnealing.h

Line 124 in 182f51b

boost::random::mt19937 generator_;

But it seems everywhere else uses std::mt19937:

OpenROAD/src/rmp/src/rmp.i

Line 52 in 182f51b

set_annealing_seed(std::mt19937::result_type annealing_seed)

OpenROAD/src/cgt/src/RandomBits.h

Line 29 in 182f51b

std::mt19937 generator;

OpenROAD/src/mpl/src/object.h

Line 424 in 182f51b

std::mt19937& generator);

OpenROAD/src/gpl/src/nesterovBase.cpp

Line 2161 in 182f51b

std::mt19937 randVal(0);

In fact another part of DPL uses std::mt19937:

OpenROAD/src/dpl/src/Place.cpp

Line 504 in 182f51b

std::mt19937 rand_gen(rand_seed_);

Is there a reason for this? Or maybe we can switch the last 2 instances over to std::mt19937?

[maliberty]

I expect you could change them all to std. The nasty ones are the *_distribution std vs boost equivalents (only the later is the guaranteed same across platforms). Feel free to PR