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chore: document cast #8268

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Merged
TomAFrench merged 3 commits into from
Apr 29, 2025
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chore: document cast #8268

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document cast
guipublic Apr 29, 2025
c28f865
Update compiler/noirc_evaluator/src/ssa/ir/instruction.rs
TomAFrench Apr 29, 2025
ac0019f
Update compiler/noirc_evaluator/src/ssa/ir/instruction.rs
TomAFrench Apr 29, 2025
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8 changes: 7 additions & 1 deletion compiler/noirc_evaluator/src/ssa/ir/instruction.rs
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Expand Up @@ -222,7 +222,13 @@ pub enum Instruction {
/// Binary Operations like +, -, *, /, ==, !=
Binary(Binary),

/// Converts `Value` into the given NumericType
/// Converts `Value` into the given `NumericType`
///
/// This operation only changes the type of the value, it does not change the value itself.
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/// It is expected that the value can fit into the target type.
/// For instance a value of type `u32` casted to `u8` must already fit into 8 bits
/// A value of type `i8` cannot be casted to 'i16' since the value would need to include the sign bit (which is the MSB)
/// Ssa code-gen must ensure that the necessary truncation or sign extension is performed when emitting a Cast instruction.
Cast(ValueId, NumericType),

/// Computes a bit wise not
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