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Add test coverage for xls.sel, xls.one_hot_sel and xls.priority_sel in xls_to_circt.mlir #4439

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Add test coverage for xls.sel, xls.one_hot_sel and xls.priority_sel in xls_to_circt.mlir #4439

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6 changes: 6 additions & 0 deletions xls/codegen/node_expressions.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -634,6 +634,9 @@ absl::StatusOr<Expression*> NodeToExpression(
case Op::kShrl:
return EmitShift(node, inputs[0], inputs[1], file);
case Op::kSignExt: {
if (node->BitCountOrDie() == node->operand(0)->BitCountOrDie()) {
return inputs[0];
}
if (node->operand(0)->BitCountOrDie() == 1) {
// A sign extension of a single-bit value is just replication.
return file->Concat(
Expand Down Expand Up @@ -709,6 +712,9 @@ absl::StatusOr<Expression*> NodeToExpression(
case Op::kXorReduce:
return file->XorReduce(inputs[0], node->loc());
case Op::kZeroExt: {
if (node->BitCountOrDie() == node->operand(0)->BitCountOrDie()) {
return inputs[0];
}
int64_t bits_added =
node->BitCountOrDie() - node->operand(0)->BitCountOrDie();

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