llvm-project/llvm/lib/Target/MSP430
Dale Johannesen 4244d12769 Teach AnalyzeBranch, RemoveBranch and the branch
folder to be tolerant of debug info following the
branch(es) at the end of a block.

llvm-svn: 100168
2010-04-02 01:38:09 +00:00
..
AsmPrinter Rip out the 'is temporary' nonsense from the MCContext interface to 2010-03-30 18:10:53 +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
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
MSP430ISelDAGToDAG.cpp remove 300 lines of code that is now dead in the MSP430 backend 2010-03-02 22:30:08 +00:00
MSP430ISelLowering.cpp IT turns out that during jumpless setcc lowering eq and ne were swapped. 2010-02-21 12:28:58 +00:00
MSP430ISelLowering.h Revert 95130. 2010-02-02 23:55:14 +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 Teach AnalyzeBranch, RemoveBranch and the branch 2010-04-02 01:38:09 +00:00
MSP430InstrInfo.h Add branch relaxation pass (shamelessly stolen from PPC). 2010-01-15 21:19:05 +00:00
MSP430InstrInfo.td The mayHaveSideEffects flag is no longer used. 2010-02-27 23:47:46 +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
MSP430MachineFunctionInfo.h Add lowering of returnaddr and frameaddr intrinsics. Shamelessly stolen from x86 :) 2009-12-07 02:28:10 +00:00
MSP430RegisterInfo.cpp Change the Value argument to eliminateFrameIndex to a type-tagged value. This 2010-03-09 21:45:49 +00:00
MSP430RegisterInfo.h Change the Value argument to eliminateFrameIndex to a type-tagged value. This 2010-03-09 21:45:49 +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
Makefile make -fno-rtti the default unless a directory builds with REQUIRES_RTTI. 2010-01-24 20:43:08 +00:00
README.txt Some preliminary variable asmprinting 2009-11-07 17:12:58 +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.