Multiple RHS Support #367
Multiple RHS Support #367
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Note: no support for multiple RHSs dump in souper-check or redis cache for now. |
| return EC; | ||
| if (!IsSat) { | ||
| RHS = I; | ||
| RHSs.emplace_back(I); |
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do you want to return here, or try to find more RHSs?
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These are both constant synthesis, why we wants to collect multiple RHSs if a constant fit the LHS
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well, it depends on why we want multiple RHSs. for manasij's purposes a constant is always good, but for building a cost model I'd like as many alternatives as possible
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ping me if you need this.
| return EC; | ||
| if (!IsSat) { | ||
| RHS = Const; | ||
| RHSs.emplace_back(Const); |
| ExhaustiveSynthesis ES; | ||
| EC = ES.synthesize(SMTSolver.get(), BPCs, PCs, LHS, RHS, IC, Timeout); | ||
| if (EC || RHS) | ||
| EC = ES.synthesize(SMTSolver.get(), BPCs, PCs, LHS, RHSs, |
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did you intend to change this line? was it too long?
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RHS is changed to RHSs, and it is too long so I wrapped.
| if (!EC && RHS) { | ||
| RHSStr = GetReplacementRHSString(RHS, Context); | ||
| if (!EC && !RHSs.empty()) { | ||
| RHSStr = GetReplacementRHSString(RHSs.front(), Context); |
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seems weird to take the first element here, is this a placeholder for something different?
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This PR does not support cache dumping yet, so only print the first RHS in the list. I'll add support for cache dumping soon.
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I'd say don't do the caching part of this yet, until we're sure we want it
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Sounds good, should be possible to prototype without caching.
lib/Infer/ExhaustiveSynthesis.cpp
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| std::vector<Inst *> Vars; | ||
| findVars(LHS, Vars); | ||
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| unsigned ValidRHS = 0; |
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why do you want a separate variable for this? doesn't it work to inspect the length of the vector?
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overall I'm not sure about this patch |
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Sure, I'll remove the unnecessary validRHS variable. |
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This patch changes the type of the RHS argument of ExhaustiveSynthesis::synthesize() and Solver::infer() from a Inst pointer to a vector of Inst pointers.
Exhaustive Synthesis takes a constant "MaxRHS". This constant is set to 1 for performance. Exhaustive Synthesis generates at most MaxRHS number of RHSs. The original Souper test suite on my machine runs for 282.54s while with MaxRHS set to 3, the test suite runs for 454.83s.
Call sites of infer() function takes the result vector of RHS and extract the first RHS, this preserves the behaviors of these call sites.