llvm-6502/lib/Target/MSP430
Anton Korobeynikov 41a024385f Propagate CPU string out of SubtargetFeatures
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72335 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-23 19:50:50 +00:00
..
CMakeLists.txt Add cmake script. No idea whether it works or not :) 2009-05-03 12:58:22 +00:00
Makefile
MSP430.h Update due to mainline API change 2009-05-03 13:19:42 +00:00
MSP430.td Add first draft of MSP430 calling convention stuff and draft of ISD::FORMAL_ARGUMENTS node lowering. 2009-05-03 12:59:33 +00:00
MSP430AsmPrinter.cpp Update due to mainline API change 2009-05-03 13:19:42 +00:00
MSP430CallingConv.td Hanle i8 returns 2009-05-03 13:11:48 +00:00
MSP430InstrFormats.td
MSP430InstrInfo.cpp Change MachineInstrBuilder::addReg() to take a flag instead of a list of 2009-05-13 21:33:08 +00:00
MSP430InstrInfo.h Add InsertBranch() hook for tail mergeing 2009-05-03 13:15:22 +00:00
MSP430InstrInfo.td Typo 2009-05-17 10:15:22 +00:00
MSP430ISelDAGToDAG.cpp Restore minor deletion. 2009-05-04 18:40:41 +00:00
MSP430ISelLowering.cpp Mark rotl/rotr as expand. This generates pretty ugly code, but this is better than nothing. 2009-05-17 10:16:28 +00:00
MSP430ISelLowering.h Make handling of conditional stuff much more straightforward 2009-05-03 13:19:09 +00:00
MSP430MachineFunctionInfo.h Add code for save/restore of callee-saved registers 2009-05-03 13:11:04 +00:00
MSP430RegisterInfo.cpp Change MachineInstrBuilder::addReg() to take a flag instead of a list of 2009-05-13 21:33:08 +00:00
MSP430RegisterInfo.h Add prologue/epilogue emission. Fix frame pointer handling. 2009-05-03 13:11:20 +00:00
MSP430RegisterInfo.td Add normal and trunc stores 2009-05-03 13:06:26 +00:00
MSP430Subtarget.cpp
MSP430Subtarget.h Propagate CPU string out of SubtargetFeatures 2009-05-23 19:50:50 +00:00
MSP430TargetAsmInfo.cpp Some eye-candy 2009-05-03 13:17:31 +00:00
MSP430TargetAsmInfo.h Some eye-candy 2009-05-03 13:17:31 +00:00
MSP430TargetMachine.cpp Update due to mainline API change 2009-05-03 13:19:42 +00:00
MSP430TargetMachine.h Update due to mainline API change 2009-05-03 13:19:42 +00:00
README.txt Add TODO list :) 2009-05-03 13:19:24 +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):

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.