llvm-6502/lib/Target/MSP430
Chris Lattner b8158acc23 Reapply my previous asmprinter changes now with more testing and two
additional bug fixes:

1. The bug that everyone hit was a problem in the asmprinter where it
   would remove $stub but keep the L prefix on a name when emitting the
   indirect symbol.  This is easy to fix by keeping the name of the stub
   and the name of the symbol in a StringMap instead of just keeping a
   StringSet and trying to reconstruct it late.

2. There was a problem printing the personality function.  The current
   logic to print out the personality function from the DWARF information
   is a bit of a cesspool right now that duplicates a bunch of other 
   logic in the asm printer.  The short version of it is that it depends
   on emitting both the L and _ prefix for symbols (at least on darwin)
   and until I can untangle it, it is best to switch the mangler back to
   emitting both prefixes.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75646 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-14 18:17:16 +00:00
..
CMakeLists.txt bug 4524: Add MSP430 to the cmake build. 2009-07-09 20:27:09 +00:00
Makefile
MSP430.h Remove unused AsmPrinter OptLevel argument, and propogate. 2009-07-01 01:48:54 +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 Reapply my previous asmprinter changes now with more testing and two 2009-07-14 18:17:16 +00:00
MSP430CallingConv.td Hanle i8 returns 2009-05-03 13:11:48 +00:00
MSP430InstrFormats.td
MSP430InstrInfo.cpp llvm_unreachable->llvm_unreachable(0), LLVM_UNREACHABLE->llvm_unreachable. 2009-07-14 16:55:14 +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 Implement changes from Chris's feedback. 2009-07-08 20:53:28 +00:00
MSP430ISelLowering.cpp llvm_unreachable->llvm_unreachable(0), LLVM_UNREACHABLE->llvm_unreachable. 2009-07-14 16:55:14 +00:00
MSP430ISelLowering.h Update comments to make it clear that the function alignment is the Log2 of the 2009-07-01 18:50:55 +00:00
MSP430MachineFunctionInfo.h Add explicit keywords. 2009-06-05 23:05:51 +00:00
MSP430RegisterInfo.cpp llvm_unreachable->llvm_unreachable(0), LLVM_UNREACHABLE->llvm_unreachable. 2009-07-14 16:55:14 +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 Remove unused AsmPrinter OptLevel argument, and propogate. 2009-07-01 01:48:54 +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.