llvm-6502/lib/Target/MSP430
Chris Lattner 518bb53485 move target-independent opcodes out of TargetInstrInfo
into TargetOpcodes.h.  #include the new TargetOpcodes.h
into MachineInstr.  Add new inline accessors (like isPHI())
to MachineInstr, and start using them throughout the 
codebase.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95687 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-09 19:54:29 +00:00
..
AsmPrinter emit instructions through the streamer. 2010-02-03 01:15:03 +00:00
TargetInfo make -fno-rtti the default unless a directory builds with REQUIRES_RTTI. 2010-01-24 20:43:08 +00:00
CMakeLists.txt Update CMake build. 2010-01-15 22:59:11 +00:00
Makefile make -fno-rtti the default unless a directory builds with REQUIRES_RTTI. 2010-01-24 20:43:08 +00:00
MSP430.h Add branch relaxation pass (shamelessly stolen from PPC). 2010-01-15 21:19:05 +00:00
MSP430.td Provide instruction sizes & encoding. No opcodes yet (but not needed so far). 2010-01-15 21:18:39 +00:00
MSP430BranchSelector.cpp Add branch relaxation pass (shamelessly stolen from PPC). 2010-01-15 21:19:05 +00:00
MSP430CallingConv.td Hanle i8 returns 2009-05-03 13:11:48 +00:00
MSP430InstrFormats.td Provide instruction sizes & encoding. No opcodes yet (but not needed so far). 2010-01-15 21:18:39 +00:00
MSP430InstrInfo.cpp move target-independent opcodes out of TargetInstrInfo 2010-02-09 19:54:29 +00:00
MSP430InstrInfo.h Add branch relaxation pass (shamelessly stolen from PPC). 2010-01-15 21:19:05 +00:00
MSP430InstrInfo.td move target-independent opcodes out of TargetInstrInfo 2010-02-09 19:54:29 +00:00
MSP430ISelDAGToDAG.cpp Change SelectCode's argument from SDValue to SDNode *, to make it more 2010-01-05 01:24:18 +00:00
MSP430ISelLowering.cpp Revert 95130. 2010-02-02 23:55:14 +00:00
MSP430ISelLowering.h Revert 95130. 2010-02-02 23:55:14 +00:00
MSP430MachineFunctionInfo.h Add lowering of returnaddr and frameaddr intrinsics. Shamelessly stolen from x86 :) 2009-12-07 02:28:10 +00:00
MSP430MCAsmInfo.cpp Eliminate SetDirective, and replace it with HasSetDirective. 2010-01-26 20:40:54 +00:00
MSP430MCAsmInfo.h Rename TargetAsmInfo (and its subclasses) to MCAsmInfo. 2009-08-22 20:48:53 +00:00
MSP430RegisterInfo.cpp Mark variable used by 'assert' as 'unused'. 2009-12-28 02:07:00 +00:00
MSP430RegisterInfo.h Make the MachineFunction argument of getFrameRegister const. 2009-11-12 21:00:03 +00:00
MSP430RegisterInfo.td Add normal and trunc stores 2009-05-03 13:06:26 +00:00
MSP430Subtarget.cpp Normalize Subtarget constructors to take a target triple string instead of 2009-08-02 22:11:08 +00:00
MSP430Subtarget.h Normalize Subtarget constructors to take a target triple string instead of 2009-08-02 22:11:08 +00:00
MSP430TargetMachine.cpp Add branch relaxation pass (shamelessly stolen from PPC). 2010-01-15 21:19:05 +00:00
MSP430TargetMachine.h Add branch relaxation pass (shamelessly stolen from PPC). 2010-01-15 21:19:05 +00:00
README.txt Some preliminary variable asmprinting 2009-11-07 17:12:58 +00:00

//===---------------------------------------------------------------------===//
// 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.