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//===- llvm/Transforms/Utils/IntegerDivision.h ------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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.
///
/// @brief 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.
///
/// @brief 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.
///
/// @brief 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.
///
/// @brief 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.
///
/// @brief 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.
///
/// @brief Replace Rem with generated code.
bool expandDivisionUpTo64Bits(BinaryOperator *Div);
} // End llvm namespace
#endif
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