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AsmParser
AsmParser
 
 
MCTargetDesc
MCTargetDesc
 
 
TargetInfo
TargetInfo
 
 
CMakeLists.txt
CMakeLists.txt
 
 
I8085.h
I8085.h
 
 
I8085.td
I8085.td
 
 
I8085AsmPrinter.cpp
I8085AsmPrinter.cpp
 
 
I8085CallingConv.td
I8085CallingConv.td
 
 
I8085CompareLowering.cpp
I8085CompareLowering.cpp
 
 
I8085CondBrInstrInfo.td
I8085CondBrInstrInfo.td
 
 
I8085ExpandPseudoInsts.cpp
I8085ExpandPseudoInsts.cpp
 
 
I8085ExpandPseudoInsts32.cpp
I8085ExpandPseudoInsts32.cpp
 
 
I8085FrameLowering.cpp
I8085FrameLowering.cpp
 
 
I8085FrameLowering.h
I8085FrameLowering.h
 
 
I8085ISelDAGToDAG.cpp
I8085ISelDAGToDAG.cpp
 
 
I8085ISelLowering.cpp
I8085ISelLowering.cpp
 
 
I8085ISelLowering.h
I8085ISelLowering.h
 
 
I8085InstrFormats.td
I8085InstrFormats.td
 
 
I8085InstrInfo.cpp
I8085InstrInfo.cpp
 
 
I8085InstrInfo.h
I8085InstrInfo.h
 
 
I8085InstrInfo.td
I8085InstrInfo.td
 
 
I8085InstrInfo32.td
I8085InstrInfo32.td
 
 
I8085MCInstLower.cpp
I8085MCInstLower.cpp
 
 
I8085MCInstLower.h
I8085MCInstLower.h
 
 
I8085MachineFunctionInfo.h
I8085MachineFunctionInfo.h
 
 
I8085RegisterInfo.cpp
I8085RegisterInfo.cpp
 
 
I8085RegisterInfo.h
I8085RegisterInfo.h
 
 
I8085RegisterInfo.td
I8085RegisterInfo.td
 
 
I8085SelectionDAGInfo.h
I8085SelectionDAGInfo.h
 
 
I8085Subtarget.cpp
I8085Subtarget.cpp
 
 
I8085Subtarget.h
I8085Subtarget.h
 
 
I8085TargetMachine.cpp
I8085TargetMachine.cpp
 
 
I8085TargetMachine.h
I8085TargetMachine.h
 
 
I8085TargetObjectFile.cpp
I8085TargetObjectFile.cpp
 
 
I8085TargetObjectFile.h
I8085TargetObjectFile.h
 
 
README.md
README.md
 
 

README.md

I8085 backend

This is the experimental LLVM backend for the intel 8085 microprocessor.

Contents

1. Implemented Functionalities

2. Some implementation notes

3. Correctness

4. Disclaimer

5. Next on priority

6. Credits

Implemented Functionalities:

Currently basic constructs such as , loading and storing variables, function call, branching statements, logical operations (and, or, xor) and two arithmetic operations such as addition and subtraction are implemented, for i8,i16,i32 integere types. Still far way to go.

Some implementation note:

  1. Arguments are passed via stack, and return value is stored in register.
  2. 8 bit integers are returned via A reg, 16 bit integers are returned via BC reg pair and 32 bit integers are returned via stack.

Correctness:

The output assembly is tested in open source 8085 simulators and assemblers. Codegen Tests are located here.

Disclaimer:

This 8085 backend is purely experimental and never tested with original hardware and never used in productional use cases.

Next on priority:

  1. Linker/Loader implementation.
  2. Adding more arithmetic operations and floating point types.

Thanks and Credits:

This backend is inspired by LLVM backend for AVR 8 bit microcontroller. Some of the functionalities here is referred from there.