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| 1 | namespace IR.Values is | |
| 2 | use Semantic.Types.Type | |
| 3 | ||
| 4 | // Decrements an int local in place, leaving nothing on the stack. | |
| 5 | // Used by a fused `take` stage: each element that reaches the stage | |
| 6 | // spends one of its count, and the loop checks the count before it | |
| 7 | // pulls the next element, so the stage itself has nothing to decide. | |
| 8 | class DECREMENT: Value is | |
| 9 | _counter_il_name: string | |
| 10 | ||
| 11 | type: Type | |
| 12 | ||
| 13 | init(counter_il_name: string, type: Type) is | |
| 14 | super.init() | |
| 15 | ||
| 16 | _counter_il_name = counter_il_name | |
| 17 | self.type = type | |
| 18 | si | |
| 19 | ||
| 20 | gen(context: IR.CONTEXT) is | |
| 21 | let body = context.current_srm_body_emitter! | |
| 22 | body.ldloc(_counter_il_name) | |
| 23 | body.ldc_i4(1) | |
| 24 | body.op(System.Reflection.Metadata.ILOpCode.SUB) | |
| 25 | body.stloc(_counter_il_name) | |
| 26 | si | |
| 27 | ||
| 28 | to_string() -> string => "decrement:({_counter_il_name})" | |
| 29 | si | |
| 30 | si |