feat(dataflow): sparse constant propagation analysis - #660
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| -- TODO: Mirror MLIR's generic `op->fold` path once Veir has an operation | ||
| -- folder and fold-result representation. For now we manually handle the | ||
| -- arithmetic ops. | ||
| match (op.get! irCtx).opType with | ||
| | .arith .constant => | ||
| if h : results.size > 0 then | ||
| -- Read the `arith.constant` and convert it into the lattice domain. | ||
| let intAttr := (op.getProperties! irCtx (.arith .constant)).value | ||
| let constant : AbstractConstant := | ||
| .constant ⟨intAttr.type.bitwidth, Data.LLVM.Int.constant intAttr.type.bitwidth intAttr.value⟩ | ||
| propagateConstant (results[0]'h) constant dfCtx irCtx | ||
| else | ||
| dfCtx | ||
| | .arith .addi => | ||
| let flags := op.getProperties! irCtx (.arith .addi) | ||
| match foldBinaryOp? op dfCtx irCtx (fun lhs rhs => | ||
| match Data.LLVM.Int.add lhs rhs flags.attr.nsw flags.attr.nuw with | ||
| | .val v => some (.val v) | ||
| | .poison => none) with | ||
| | some constant => | ||
| if h : results.size > 0 then | ||
| propagateConstant (results[0]'h) constant dfCtx irCtx | ||
| else | ||
| dfCtx | ||
| | none => | ||
| setAllToUnknownConstants results dfCtx irCtx | ||
| | .arith .muli => | ||
| let flags := op.getProperties! irCtx (.arith .muli) | ||
| match foldBinaryOp? op dfCtx irCtx (fun lhs rhs => | ||
| match Data.LLVM.Int.mul lhs rhs flags.attr.nsw flags.attr.nuw with | ||
| | .val v => some (.val v) | ||
| | .poison => none) with | ||
| | some constant => | ||
| if h : results.size > 0 then | ||
| propagateConstant (results[0]'h) constant dfCtx irCtx | ||
| else | ||
| dfCtx | ||
| | none => | ||
| setAllToUnknownConstants results dfCtx irCtx | ||
| | .arith .andi => | ||
| match foldBinaryOp? op dfCtx irCtx (fun lhs rhs => | ||
| match lhs, rhs with | ||
| | .val lhs', .val rhs' => some (.val (BitVec.and lhs' rhs')) | ||
| | _, _ => none) with | ||
| | some constant => | ||
| if h : results.size > 0 then | ||
| propagateConstant (results[0]'h) constant dfCtx irCtx | ||
| else | ||
| dfCtx | ||
| | none => | ||
| setAllToUnknownConstants results dfCtx irCtx | ||
| | .arith .subi => | ||
| let flags := op.getProperties! irCtx (.arith .subi) | ||
| match foldBinaryOp? op dfCtx irCtx (fun lhs rhs => | ||
| match Data.LLVM.Int.sub lhs rhs flags.attr.nsw flags.attr.nuw with | ||
| | .val v => some (.val v) | ||
| | .poison => none) with | ||
| | some constant => | ||
| if h : results.size > 0 then | ||
| propagateConstant (results[0]'h) constant dfCtx irCtx | ||
| else | ||
| dfCtx | ||
| | none => | ||
| setAllToUnknownConstants results dfCtx irCtx | ||
| | _ => | ||
| setAllToUnknownConstants results dfCtx irCtx |
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