llvm-6502/lib/Target/MSP430
Chris Lattner c7b8814bb4 give MCAsmInfo a 'has little endian' bit. This is unfortunate, but
I really want clients of the streamer to be able to say "emit this
64-bit integer" and have it get broken down right by the streamer.

I may change this in the future, we'll see how it works out.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93934 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-19 22:42:28 +00:00
..
AsmPrinter Now that we have everything nicely factored (e.g. asmprinter is not 2010-01-19 05:38:33 +00:00
TargetInfo Factor commonality in triple match routines into helper template for registering 2009-07-26 05:03:33 +00:00
CMakeLists.txt Update CMake build. 2010-01-15 22:59:11 +00:00
Makefile Give MSP430 a separate asmprinter lib 2009-08-14 18:28:12 +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 Add branch relaxation pass (shamelessly stolen from PPC). 2010-01-15 21:19:05 +00:00
MSP430InstrInfo.h Add branch relaxation pass (shamelessly stolen from PPC). 2010-01-15 21:19:05 +00:00
MSP430InstrInfo.td Add branch relaxation pass (shamelessly stolen from PPC). 2010-01-15 21:19:05 +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 zext / truncate is free on msp430. Inform codegen about this. 2010-01-15 21:19:43 +00:00
MSP430ISelLowering.h zext / truncate is free on msp430. Inform codegen about this. 2010-01-15 21:19:43 +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 give MCAsmInfo a 'has little endian' bit. This is unfortunate, but 2010-01-19 22:42:28 +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.