[LLVM] Add random seed support #2297
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…y present in the argument to initialize call
…ichi into random_seed_2251
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Related issue = close #2251
This is the last of 3 PRs regarding #2251, which allows for specification of random seed when initializing Taichi runtime. With different random seeds, two Taichi runtime contexts on the same machine (presumably) and backend will produce different random number sequences, and vice versa. The corresponding
test_random_seed_per_programtest fails before this PR and passes after.Due to the parallel nature of Taichi runtime, the random seed is multiplied by 2^20 to obtain the initial random state for the RNG, assuming that number of threads is well below 2^20 so that no two threads share the same random state.
As the title suggests, specification of random seed only works for CPU and CUDA backends. For OpenGL and Metal backends the random seed always varies from run to run.
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