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…ched by indirect function calls (CUDA) or direct callables (Optix) but converted into switch-like statements
…table rather than a series of individual branches.
…a binary search to branch to the appropriate vcall.
Speierers
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Dec 8, 2022
| bool jump_table = jit_flag(JitFlag::VCallBranchJumpTable); | ||
| bool binary_search = jit_flag(JitFlag::VCallBranchBinarySearch); | ||
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| if (jump_table == binary_search) { |
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I am intrigued by this condition. I suppose this could also be written as !jump_table && !binary_search? In the case where both are true we should throw an error no?
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| if (jump_table) | ||
| jitc_log(Warn, "jitc_var_vcall_assemble_cuda(): both " | ||
| "JitFlag::VCallBranchJumpTable and " | ||
| "JitFlag::VCallBranchBinarySearch are enabled, " | ||
| "defaulting back to linear search!"); |
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I see this now. Maybe we should throw an exception instead?
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This PR adds different strategies to handle virtual function calls.
Currently, in order to do a virtual function call in CUDA, we use indirect function calls to call either an OptiX direct callable or a CUDA function. Given that we know exactly the set of possible targets for any virtual function call, it is not necessary to have the indirection and we can explicitly call the appropriate target function.
This PR adds a new
JitFlag, calledVCallBranchwhich will replace the indirect function call by a series of branches to call the appropriate target function. There are three different branching strategies implemented:VCallBranch.VCallBranchBinarySearchJIT flag.VCallBranchJumpTableJIT flag