[Mlir-commits] [mlir] Add a polynomial dialect shell, attributes, and types (PR #72081)

[Jeremy Kun]

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+//===- PolynomialAttributes.cpp - Polynomial dialect attrs ------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#include "mlir/Dialect/Polynomial/IR/PolynomialAttributes.h"
+
+#include "mlir/Dialect/Polynomial/IR/Polynomial.h"
+#include "mlir/Support/LLVM.h"
+#include "mlir/Support/LogicalResult.h"
+#include "llvm/ADT/SmallSet.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/StringSet.h"
+
+namespace mlir {
+namespace polynomial {
+
+void PolynomialAttr::print(AsmPrinter &p) const {
+  p << '<';
+  p << getPolynomial();
+  p << '>';
+}
+
+/// Try to parse a monomial. If successful, populate the fields of the outparam
+/// `monomial` with the results, and the `variable` outparam with the parsed
+/// variable name. Sets shouldParseMore to true if the monomial is followed by
+/// a '+'.
+ParseResult parseMonomial(AsmParser &parser, Monomial &monomial,
+                          llvm::StringRef &variable, bool *isConstantTerm,
+                          bool *shouldParseMore) {
+  APInt parsedCoeff(apintBitWidth, 1);
+  auto parsedCoeffResult = parser.parseOptionalInteger(parsedCoeff);
+  monomial.coefficient = parsedCoeff;
+
+  *isConstantTerm = false;
+  *shouldParseMore = false;
+
+  // A + indicates it's a constant term with more to go, as in `1 + x`.
+  if (succeeded(parser.parseOptionalPlus())) {
+    // If no coefficient was parsed, and there's a +, then it's effectively
+    // parsing an empty string.
+    if (!parsedCoeffResult.has_value()) {
+      return failure();
+    }
+    monomial.exponent = APInt(apintBitWidth, 0);
+    *isConstantTerm = true;
+    *shouldParseMore = true;
+    return success();
+  }
+
+  // A monomial can be a trailing constant term, as in `x + 1`
+  if (failed(parser.parseOptionalKeyword(&variable))) {
+    // If neither a coefficient nor a variable was found, then it's effectively
+    // parsing an empty string.
+    if (!parsedCoeffResult.has_value()) {
+      return failure();
+    }
+
+    monomial.exponent = APInt(apintBitWidth, 0);
+    *isConstantTerm = true;
+    return success();
+  }
+
+  // Parse exponentiation symbol as **
+  // We can't use caret because it's reserved for basic block identifiers
+  // If no star is present, it's treated as a polynomial with exponent 1
----------------
j2kun wrote:

Fixed in 23dc5223042

https://github.com/llvm/llvm-project/pull/72081