llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-18 10:08:34 +00:00

History

Dan Gohman 602b0c8c17 Rename getTargetNode to getMachineNode, for consistency with the naming scheme used in SelectionDAG, where there are multiple kinds of "target" nodes, but "machine" nodes are nodes which represent a MachineInstr. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82790 91177308-0d34-0410-b5e6-96231b3b80d8		2009-09-25 18:54:59 +00:00
..
AsmPrinter	remove all but one reference to TargetRegisterDesc::AsmName.	2009-09-13 20:31:40 +00:00
TargetInfo
CMakeLists.txt
Makefile
MSP430.h
MSP430.td
MSP430CallingConv.td
MSP430InstrFormats.td
MSP430InstrInfo.cpp
MSP430InstrInfo.h
MSP430InstrInfo.td
MSP430ISelDAGToDAG.cpp	Rename getTargetNode to getMachineNode, for consistency with the	2009-09-25 18:54:59 +00:00
MSP430ISelLowering.cpp	Fix PR4926. When target hook EmitInstrWithCustomInserter() insert new basic blocks and update CFG, it should also inform sdisel of the changes so the phi source operands will come from the right basic blocks.	2009-09-19 09:51:03 +00:00
MSP430ISelLowering.h	Enhance EmitInstrWithCustomInserter() so target can specify CFG changes that sdisel will use to properly complete phi nodes.	2009-09-18 21:02:19 +00:00
MSP430MachineFunctionInfo.h
MSP430MCAsmInfo.cpp	Allow symbols to start from the digit if target requests it. This allows, e.g. pinning	2009-09-18 16:57:42 +00:00
MSP430MCAsmInfo.h
MSP430RegisterInfo.cpp	Remove some unused variables and methods warned about by	2009-09-06 08:33:48 +00:00
MSP430RegisterInfo.h
MSP430RegisterInfo.td
MSP430Subtarget.cpp
MSP430Subtarget.h
MSP430TargetMachine.cpp
MSP430TargetMachine.h
README.txt

README.txt

//===---------------------------------------------------------------------===//
// MSP430 backend.
//===---------------------------------------------------------------------===//

DISCLAIMER: Thid backend should be considered as highly experimental. I never
seen nor worked with this MCU, all information was gathered from datasheet
only. The original intention of making this backend was to write documentation
of form "How to write backend for dummies" :) Thes notes hopefully will be
available pretty soon.

Some things are incomplete / not implemented yet (this list surely is not
complete as well):

0. Implement asmprinting for variables :)

1. Verify, how stuff is handling implicit zext with 8 bit operands (this might
be modelled currently in improper way - should we need to mark the superreg as
def for every 8 bit instruction?).

2. Libcalls: multiplication, division, remainder. Note, that calling convention
for libcalls is incomptible with calling convention of libcalls of msp430-gcc
(these cannot be used though due to license restriction).

3. Implement multiplication / division by constant (dag combiner hook?).

4. Implement non-constant shifts.

5. Implement varargs stuff.

6. Verify and fix (if needed) how's stuff playing with i32 / i64.

7. Implement floating point stuff (softfp?)

8. Implement instruction encoding for (possible) direct code emission in the
future.

9. Since almost all instructions set flags - implement brcond / select in better
way (currently they emit explicit comparison).

10. Handle imm in comparisons in better way (see comment in MSP430InstrInfo.td)

11. Implement hooks for better memory op folding, etc.