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feat: Optimize x < 0 for unsigned x to false #2206

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merged 2 commits into from
Aug 8, 2023
Merged

feat: Optimize x < 0 for unsigned x to false #2206

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bae2e53
feat: Optimize `x < 0` for unsigned `x` to false
TomAFrench Aug 8, 2023
e667b8f
chore: add `Type::is_unsigned(&self)` method
TomAFrench Aug 8, 2023
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7 changes: 7 additions & 0 deletions crates/noirc_evaluator/src/ssa/ir/instruction.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -593,6 +593,13 @@ impl Binary {
let zero = dfg.make_constant(FieldElement::zero(), Type::bool());
return SimplifyResult::SimplifiedTo(zero);
}
if let Type::Numeric(NumericType::Unsigned { .. }) = operand_type {
if rhs_is_zero {
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// Unsigned values cannot be less than zero.
let zero = dfg.make_constant(FieldElement::zero(), Type::bool());
return SimplifyResult::SimplifiedTo(zero);
}
}
}
BinaryOp::And => {
if lhs_is_zero || rhs_is_zero {
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