feat[venom]: new DFTPass algorithm
#4255
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this commit adds a small heuristic for cleaning the input stack from cfg_in, which is to pop the shallowest items first. it also cleans up the code a little bit and adds stronger preconditions to the code. a further optimization would be to try to align the output stack as best as possible at the jnz, but that belongs in the DFT pass.
…o feat/venom-pops
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| if write_effect in last_write_effects and last_write_effects[write_effect] != inst: | ||
| self.barriers[inst].add(last_write_effects[write_effect]) | ||
| if write_effect in last_read_effects: | ||
| self.barriers[inst].add(last_read_effects[write_effect]) |
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maybe some way to do it without the loop? e.g.
self.barriers[inst] |= (write_effects & last_read_effects)
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What I did
I upgraded the DFT algorithm to allow for more instruction movement and performs "multidimensional" fencing. It also removes the use of order ids and sorting.
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