Merge "Update prebuilt Clang to r353983." into p9.0HEADp9.0-backupp9.0

1 files changed, 72 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/Transforms/Utils/IntegerDivision.h b/clang-r353983/include/llvm/Transforms/Utils/IntegerDivision.h
new file mode 100644
index 00000000..35cae9aa
--- /dev/null
+++ b/clang-r353983/include/llvm/Transforms/Utils/IntegerDivision.h
@@ -0,0 +1,72 @@
+//===- llvm/Transforms/Utils/IntegerDivision.h ------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains an implementation of 32bit and 64bit scalar integer
+// division for targets that don't have native support. It's largely derived
+// from compiler-rt's implementations of __udivsi3 and __udivmoddi4,
+// but hand-tuned for targets that prefer less control flow.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_UTILS_INTEGERDIVISION_H
+#define LLVM_TRANSFORMS_UTILS_INTEGERDIVISION_H
+
+namespace llvm {
+  class BinaryOperator;
+}
+
+namespace llvm {
+
+  /// Generate code to calculate the remainder of two integers, replacing Rem
+  /// with the generated code. This currently generates code using the udiv
+  /// expansion, but future work includes generating more specialized code,
+  /// e.g. when more information about the operands are known. Implements both
+  /// 32bit and 64bit scalar division.
+  ///
+  /// Replace Rem with generated code.
+  bool expandRemainder(BinaryOperator *Rem);
+
+  /// Generate code to divide two integers, replacing Div with the generated
+  /// code. This currently generates code similarly to compiler-rt's
+  /// implementations, but future work includes generating more specialized code
+  /// when more information about the operands are known. Implements both
+  /// 32bit and 64bit scalar division.
+  ///
+  /// Replace Div with generated code.
+  bool expandDivision(BinaryOperator* Div);
+
+  /// Generate code to calculate the remainder of two integers, replacing Rem
+  /// with the generated code. Uses ExpandReminder with a 32bit Rem which
+  /// makes it useful for targets with little or no support for less than
+  /// 32 bit arithmetic.
+  ///
+  /// Replace Rem with generated code.
+  bool expandRemainderUpTo32Bits(BinaryOperator *Rem);
+
+  /// Generate code to calculate the remainder of two integers, replacing Rem
+  /// with the generated code. Uses ExpandReminder with a 64bit Rem.
+  ///
+  /// Replace Rem with generated code.
+  bool expandRemainderUpTo64Bits(BinaryOperator *Rem);
+
+  /// Generate code to divide two integers, replacing Div with the generated
+  /// code. Uses ExpandDivision with a 32bit Div which makes it useful for
+  /// targets with little or no support for less than 32 bit arithmetic.
+  ///
+  /// Replace Rem with generated code.
+  bool expandDivisionUpTo32Bits(BinaryOperator *Div);
+
+  /// Generate code to divide two integers, replacing Div with the generated
+  /// code. Uses ExpandDivision with a 64bit Div.
+  ///
+  /// Replace Rem with generated code.
+  bool expandDivisionUpTo64Bits(BinaryOperator *Div);
+
+} // End llvm namespace
+
+#endif