llvm-6502/lib/Target/MSP430
Dan Gohman eeb3a00b84 Change SelectCode's argument from SDValue to SDNode *, to make it more
clear what information these functions are actually using.

This is also a micro-optimization, as passing a SDNode * around is
simpler than passing a { SDNode *, int } by value or reference.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92564 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-05 01:24:18 +00:00
..
AsmPrinter Pass the error string directly to llvm_unreachable instead of the residual 2009-12-18 00:27:18 +00:00
TargetInfo Factor commonality in triple match routines into helper template for registering 2009-07-26 05:03:33 +00:00
CMakeLists.txt Normalize makefile comments and sort cmake file lists. 2009-08-31 13:05:24 +00:00
Makefile Give MSP430 a separate asmprinter lib 2009-08-14 18:28:12 +00:00
MSP430.h Cosmetic changes, no functionality changes 2009-10-21 19:16:49 +00:00
MSP430.td Drop old asmprinter stuff 2009-11-07 17:12:21 +00:00
MSP430CallingConv.td Hanle i8 returns 2009-05-03 13:11:48 +00:00
MSP430InstrFormats.td
MSP430InstrInfo.cpp Remove the target hook TargetInstrInfo::BlockHasNoFallThrough in favor of 2009-12-05 00:44:40 +00:00
MSP430InstrInfo.h Remove the target hook TargetInstrInfo::BlockHasNoFallThrough in favor of 2009-12-05 00:44:40 +00:00
MSP430InstrInfo.td Implement variable-width shifts. 2009-12-12 18:55:37 +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 Implement variable-width shifts. 2009-12-12 18:55:37 +00:00
MSP430ISelLowering.h Implement variable-width shifts. 2009-12-12 18:55:37 +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 Use semicolon as assembler comment string 2009-11-22 01:12:49 +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 indicate what the native integer types for the target are. 2009-11-07 19:07:32 +00:00
MSP430TargetMachine.h Change TargetAsmInfo to be constructed via TargetRegistry from a Target+Triple 2009-08-12 07:22:17 +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.