groth16: filter points at infinity in setup #130
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…es generation of pk
… groth16.Setup(B)
…ots of zeroes in input
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fixes:
groth16.Provewithforce=truewasn't doing much since msm with zeroes don't do much.perf:
groth16.Setupproducespk.G1.A,pk.G1.Bandpk.G2.B, derived from the QAP. However, if a variable doesn't appear in a QAP column, the value of the corresponding interpolation vector is 0, and the resulting point in the proving key is infinity.Additionally,
frontend.newR1Cwill put the variable with the longest linear expression in theApart of the QAP, maximizing the number of zeroes in theBpart.In one internal circuit, using a lot of
MiMC, this speeds upgroth16.Proveby ~30%.