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Fix ReturnOp exit predicate logic #220
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| Original file line number | Diff line number | Diff line change | ||
|---|---|---|---|---|
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@@ -602,6 +602,62 @@ void transformControlFlowToDataFlow(Region ®ion, ControlFlowInfo &ctrl_info, | |||
| } | ||||
| } | ||||
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| // Injects exit predicate for ReturnOp (only for void returns). | ||||
| // Value-returning functions are not modified. | ||||
| void injectExitPredicateForReturn(Region ®ion, ControlFlowInfo &ctrl_info, | ||||
| OpBuilder &builder) { | ||||
| Block *entry_block = ®ion.front(); | ||||
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| // Finds the ReturnOp. | ||||
| neura::ReturnOp return_op = nullptr; | ||||
| for (Operation &op : *entry_block) { | ||||
| if (auto rt = dyn_cast<neura::ReturnOp>(op)) { | ||||
| return_op = rt; | ||||
| llvm::errs() << "[ctrl2data] ReturnOp found: " << *rt << "\n"; | ||||
| break; | ||||
| } | ||||
| } | ||||
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| if (!return_op) { | ||||
| return; // No ReturnOp to process | ||||
| } | ||||
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| // Checks if ReturnOp has operands (value return). | ||||
| // Only injects exit predicate for void returns. | ||||
| if (return_op.getNumOperands() > 0) { | ||||
| llvm::errs() << "[ctrl2data] ReturnOp has return value, skipping exit predicate injection.\n"; | ||||
| return; // Skips modification for value-returning functions. | ||||
| } | ||||
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| // Computes exit predicate: use a constant true predicate for now. | ||||
| llvm::errs() << "[ctrl2data] Injecting exit predicate for void ReturnOp.\n"; | ||||
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| builder.setInsertionPoint(return_op); | ||||
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| // Creates a constant true predicate. | ||||
| auto i1_type = builder.getI1Type(); | ||||
| auto pred_type = neura::PredicatedValue::get(builder.getContext(), i1_type, i1_type); | ||||
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| Value true_constant = builder.create<neura::ConstantOp>( | ||||
| return_op.getLoc(), | ||||
| pred_type, | ||||
| builder.getIntegerAttr(i1_type, 1)); | ||||
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| Value granted_true = builder.create<neura::GrantOnceOp>( | ||||
| return_op.getLoc(), | ||||
| pred_type, | ||||
| true_constant); | ||||
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| // Replaces the old ReturnOp with a new one that includes the exit predicate. | ||||
| builder.setInsertionPoint(return_op); | ||||
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| builder.setInsertionPoint(return_op); |
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The ctrl_info parameter is declared but never used in the function body. Consider removing this unused parameter to simplify the function signature.