73 lines
2.9 KiB
C++
73 lines
2.9 KiB
C++
//===- llvm/Transforms/Utils/IntegerDivision.h ------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains an implementation of 32bit and 64bit scalar integer
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// division for targets that don't have native support. It's largely derived
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// from compiler-rt's implementations of __udivsi3 and __udivmoddi4,
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// but hand-tuned for targets that prefer less control flow.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_INTEGERDIVISION_H
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#define LLVM_TRANSFORMS_UTILS_INTEGERDIVISION_H
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namespace llvm {
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class BinaryOperator;
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}
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namespace llvm {
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/// Generate code to calculate the remainder of two integers, replacing Rem
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/// with the generated code. This currently generates code using the udiv
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/// expansion, but future work includes generating more specialized code,
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/// e.g. when more information about the operands are known. Implements both
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/// 32bit and 64bit scalar division.
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///
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/// Replace Rem with generated code.
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bool expandRemainder(BinaryOperator *Rem);
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/// Generate code to divide two integers, replacing Div with the generated
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/// code. This currently generates code similarly to compiler-rt's
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/// implementations, but future work includes generating more specialized code
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/// when more information about the operands are known. Implements both
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/// 32bit and 64bit scalar division.
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///
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/// Replace Div with generated code.
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bool expandDivision(BinaryOperator* Div);
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/// Generate code to calculate the remainder of two integers, replacing Rem
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/// with the generated code. Uses ExpandReminder with a 32bit Rem which
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/// makes it useful for targets with little or no support for less than
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/// 32 bit arithmetic.
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///
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/// Replace Rem with generated code.
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bool expandRemainderUpTo32Bits(BinaryOperator *Rem);
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/// Generate code to calculate the remainder of two integers, replacing Rem
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/// with the generated code. Uses ExpandReminder with a 64bit Rem.
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///
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/// Replace Rem with generated code.
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bool expandRemainderUpTo64Bits(BinaryOperator *Rem);
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/// Generate code to divide two integers, replacing Div with the generated
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/// code. Uses ExpandDivision with a 32bit Div which makes it useful for
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/// targets with little or no support for less than 32 bit arithmetic.
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///
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/// Replace Rem with generated code.
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bool expandDivisionUpTo32Bits(BinaryOperator *Div);
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/// Generate code to divide two integers, replacing Div with the generated
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/// code. Uses ExpandDivision with a 64bit Div.
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///
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/// Replace Rem with generated code.
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bool expandDivisionUpTo64Bits(BinaryOperator *Div);
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} // End llvm namespace
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#endif
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