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Diffstat (limited to 'src/types/expression_stack.rs')
| -rw-r--r-- | src/types/expression_stack.rs | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/types/expression_stack.rs b/src/types/expression_stack.rs index d14d808..8e1c87d 100644 --- a/src/types/expression_stack.rs +++ b/src/types/expression_stack.rs @@ -62,6 +62,7 @@ impl ExpressionStack { Operator::BitXor => { pop!(b); pop!(a); push!(a ^ b) }, Operator::BitNot => { pop!(a); push!(!a) }, Operator::Length => { pop!(a); push!(width(a) as isize) }, + Operator::Tally => { pop!(a); push!(tally(a) as isize) }, } return Ok(()); } @@ -76,6 +77,13 @@ pub fn width(value: isize) -> u32 { } } +pub fn tally(value: isize) -> u32 { + let width = width(value); + let mask = 2i32.pow(width) -1; + let value = (value as usize) & (mask as usize); + return value.count_ones(); +} + pub enum StackError { Underflow, MultipleReturnValues, |