llvm-6502/lib/Target/MSP430
Chris Lattner 41aefdcdd1 make printInstruction return void since its result is omitted. Make the
error condition get trapped with an assert.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78449 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-08 01:32:19 +00:00
..
TargetInfo Factor commonality in triple match routines into helper template for registering 2009-07-26 05:03:33 +00:00
CMakeLists.txt bug 4524: Add MSP430 to the cmake build. 2009-07-09 20:27:09 +00:00
Makefile Add TargetInfo libraries for all targets. 2009-07-15 06:35:19 +00:00
MSP430.h Add new helpers for registering targets. 2009-07-25 06:49:55 +00:00
MSP430.td
MSP430AsmPrinter.cpp make printInstruction return void since its result is omitted. Make the 2009-08-08 01:32:19 +00:00
MSP430CallingConv.td
MSP430InstrFormats.td
MSP430InstrInfo.cpp llvm_unreachable->llvm_unreachable(0), LLVM_UNREACHABLE->llvm_unreachable. 2009-07-14 16:55:14 +00:00
MSP430InstrInfo.h
MSP430InstrInfo.td Special constants as destinations does not work as expected - drop the patterns. 2009-08-05 14:42:00 +00:00
MSP430ISelDAGToDAG.cpp Implement changes from Chris's feedback. 2009-07-08 20:53:28 +00:00
MSP430ISelLowering.cpp Major calling convention code refactoring. 2009-08-05 01:29:28 +00:00
MSP430ISelLowering.h Major calling convention code refactoring. 2009-08-05 01:29:28 +00:00
MSP430MachineFunctionInfo.h Add explicit keywords. 2009-06-05 23:05:51 +00:00
MSP430RegisterInfo.cpp Give getPointerRegClass() a "kind" value so that targets can 2009-07-29 20:31:52 +00:00
MSP430RegisterInfo.h Give getPointerRegClass() a "kind" value so that targets can 2009-07-29 20:31:52 +00:00
MSP430RegisterInfo.td
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
MSP430TargetAsmInfo.cpp MSP430 TAI doesn't need TM. 2009-08-02 04:45:22 +00:00
MSP430TargetAsmInfo.h MSP430 TAI doesn't need TM. 2009-08-02 04:45:22 +00:00
MSP430TargetMachine.cpp Move most targets TargetMachine constructor to only taking a target triple. 2009-08-02 23:37:13 +00:00
MSP430TargetMachine.h Move most targets TargetMachine constructor to only taking a target triple. 2009-08-02 23:37:13 +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.