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fix: handle OR call for constant inputs #1592

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fix: handle OR call for constant inputs #1592

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4bec541
fix: handle OR call for constant inputs
ivokub Aug 29, 2025
75c450f
chore: use stored cnst instead of ints
ivokub Sep 2, 2025
a4c3a11
chore: return constant LE
ivokub Sep 2, 2025
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25 changes: 25 additions & 0 deletions frontend/cs/r1cs/api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -408,6 +408,31 @@ func (builder *builder[E]) Or(_a, _b frontend.Variable) frontend.Variable {
builder.AssertIsBoolean(a)
builder.AssertIsBoolean(b)

_aC, aConstant := builder.constantValue(a)
_bC, bConstant := builder.constantValue(b)

if aConstant && bConstant {
if builder.cs.IsOne(_aC) || builder.cs.IsOne(_bC) {
return builder.cstOne()
}
return builder.cstZero()
}

// if one input is constant, ensure we put it in b
if aConstant {
a, b = b, a
_bC = _aC
bConstant = aConstant
}

if bConstant {
if builder.cs.IsOne(_bC) {
return builder.cstOne()
} else {
return a
}
}

// the formulation used is for easing up the conversion to sparse r1cs
res := builder.newInternalVariable()
builder.MarkBoolean(res)
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