llvm-6502/lib/Target/MSP430
2012-10-24 17:22:41 +00:00
..
InstPrinter
MCTargetDesc
TargetInfo
CMakeLists.txt
LLVMBuild.txt
Makefile
MSP430.h
MSP430.td
MSP430AsmPrinter.cpp
MSP430BranchSelector.cpp
MSP430CallingConv.td
MSP430FrameLowering.cpp Fix fallout from RegInfo => FrameLowering refactoring on MSP430. 2012-10-17 17:37:11 +00:00
MSP430FrameLowering.h Fix fallout from RegInfo => FrameLowering refactoring on MSP430. 2012-10-17 17:37:11 +00:00
MSP430InstrFormats.td
MSP430InstrInfo.cpp
MSP430InstrInfo.h
MSP430InstrInfo.td
MSP430ISelDAGToDAG.cpp Revert 'Fix a typo 'iff' => 'if''. iff is an abreviation of if and only if. See: http://en.wikipedia.org/wiki/If_and_only_if Commit 164767 2012-09-27 10:14:43 +00:00
MSP430ISelLowering.cpp Resubmit the changes to llvm core to update the functions to support different pointer sizes on a per address space basis. 2012-10-15 16:24:29 +00:00
MSP430ISelLowering.h Move TargetData to DataLayout. 2012-10-08 16:38:25 +00:00
MSP430MachineFunctionInfo.cpp
MSP430MachineFunctionInfo.h
MSP430MCInstLower.cpp
MSP430MCInstLower.h
MSP430RegisterInfo.cpp Fix fallout from RegInfo => FrameLowering refactoring on MSP430. 2012-10-17 17:37:11 +00:00
MSP430RegisterInfo.h Fix fallout from RegInfo => FrameLowering refactoring on MSP430. 2012-10-17 17:37:11 +00:00
MSP430RegisterInfo.td
MSP430SelectionDAGInfo.cpp
MSP430SelectionDAGInfo.h
MSP430Subtarget.cpp
MSP430Subtarget.h
MSP430TargetMachine.cpp Implement a basic VectorTargetTransformInfo interface to be used by the loop and bb vectorizers for modeling the cost of instructions. 2012-10-24 17:22:41 +00:00
MSP430TargetMachine.h Reapply the TargerTransformInfo changes, minus the changes to LSR and Lowerinvoke. 2012-10-18 23:22:48 +00:00
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):

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.