llvm-6502/lib/Target/MSP430
Evan Cheng 5a96b3dad2 Add bundle aware API for querying instruction properties and switch the code
generator to it. For non-bundle instructions, these behave exactly the same
as the MC layer API.

For properties like mayLoad / mayStore, look into the bundle and if any of the
bundled instructions has the property it would return true.
For properties like isPredicable, only return true if *all* of the bundled
instructions have the property.
For properties like canFoldAsLoad, isCompare, conservatively return false for
bundles.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146026 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-07 07:15:52 +00:00
..
InstPrinter build/CMake: Finish removal of add_llvm_library_dependencies. 2011-11-29 19:25:30 +00:00
MCTargetDesc build/CMake: Finish removal of add_llvm_library_dependencies. 2011-11-29 19:25:30 +00:00
TargetInfo build/CMake: Finish removal of add_llvm_library_dependencies. 2011-11-29 19:25:30 +00:00
CMakeLists.txt build/CMake: Finish removal of add_llvm_library_dependencies. 2011-11-29 19:25:30 +00:00
LLVMBuild.txt LLVMBuild: Add explicit information on whether targets define an assembly printer, assembly parser, or disassembler. 2011-11-11 00:23:56 +00:00
Makefile Next round of MC refactoring. This patch factor MC table instantiations, MC 2011-07-14 20:59:42 +00:00
MSP430.h Next round of MC refactoring. This patch factor MC table instantiations, MC 2011-07-14 20:59:42 +00:00
MSP430.td
MSP430AsmPrinter.cpp Move TargetRegistry and TargetSelect from Target to Support where they belong. 2011-08-24 18:08:43 +00:00
MSP430BranchSelector.cpp
MSP430CallingConv.td
MSP430FrameLowering.cpp Add bundle aware API for querying instruction properties and switch the code 2011-12-07 07:15:52 +00:00
MSP430FrameLowering.h
MSP430InstrFormats.td
MSP430InstrInfo.cpp Add bundle aware API for querying instruction properties and switch the code 2011-12-07 07:15:52 +00:00
MSP430InstrInfo.h Hide the call to InitMCInstrInfo into tblgen generated ctor. 2011-07-01 17:57:27 +00:00
MSP430InstrInfo.td
MSP430ISelDAGToDAG.cpp
MSP430ISelLowering.cpp Remove some unnecessary includes of PseudoSourceValue.h. 2011-11-15 07:24:32 +00:00
MSP430ISelLowering.h land David Blaikie's patch to de-constify Type, with a few tweaks. 2011-07-18 04:54:35 +00:00
MSP430MachineFunctionInfo.h
MSP430MCInstLower.cpp
MSP430MCInstLower.h
MSP430RegisterInfo.cpp Sink getDwarfRegNum, getLLVMRegNum, getSEHRegNum from TargetRegisterInfo down 2011-07-18 20:57:22 +00:00
MSP430RegisterInfo.h Sink getDwarfRegNum, getLLVMRegNum, getSEHRegNum from TargetRegisterInfo down 2011-07-18 20:57:22 +00:00
MSP430RegisterInfo.td Use set operations instead of plain lists to enumerate register classes. 2011-06-15 23:28:14 +00:00
MSP430SelectionDAGInfo.cpp
MSP430SelectionDAGInfo.h
MSP430Subtarget.cpp Move TargetRegistry and TargetSelect from Target to Support where they belong. 2011-08-24 18:08:43 +00:00
MSP430Subtarget.h Compute feature bits at time of MCSubtargetInfo initialization. 2011-07-07 07:07:08 +00:00
MSP430TargetMachine.cpp Move global variables in TargetMachine into new TargetOptions class. As an API 2011-12-02 22:16:29 +00:00
MSP430TargetMachine.h Move global variables in TargetMachine into new TargetOptions class. As an API 2011-12-02 22:16:29 +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.