llvm-6502/lib/Target/MSP430
Dan Gohman 533297b58d Rename usesCustomDAGSchedInserter to usesCustomInserter, and update a
bunch of associated comments, because it doesn't have anything to do
with DAGs or scheduling. This is another step in decoupling MachineInstr
emitting from scheduling.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85517 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-29 18:10:34 +00:00
..
AsmPrinter Update CMake files. 2009-10-26 22:06:01 +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 Add first draft of MSP430 calling convention stuff and draft of ISD::FORMAL_ARGUMENTS node lowering. 2009-05-03 12:59:33 +00:00
MSP430CallingConv.td Hanle i8 returns 2009-05-03 13:11:48 +00:00
MSP430InstrFormats.td
MSP430InstrInfo.cpp RMW preprocessing stuff was incorrect. Grab the stuff from x86 backend and disable some tests until it will be clever enough to handle them. 2009-10-21 19:17:55 +00:00
MSP430InstrInfo.h Implement branch folding 2009-10-21 19:17:18 +00:00
MSP430InstrInfo.td Rename usesCustomDAGSchedInserter to usesCustomInserter, and update a 2009-10-29 18:10:34 +00:00
MSP430ISelDAGToDAG.cpp Shift art to the right to keep GCC from complaining about multi-line comments. 2009-10-22 09:28:49 +00:00
MSP430ISelLowering.cpp Cosmetic changes, no functionality changes 2009-10-21 19:16:49 +00:00
MSP430ISelLowering.h Enhance EmitInstrWithCustomInserter() so target can specify CFG changes that sdisel will use to properly complete phi nodes. 2009-09-18 21:02:19 +00:00
MSP430MachineFunctionInfo.h Add explicit keywords. 2009-06-05 23:05:51 +00:00
MSP430MCAsmInfo.cpp Allow symbols to start from the digit if target requests it. This allows, e.g. pinning 2009-09-18 16:57:42 +00:00
MSP430MCAsmInfo.h Rename TargetAsmInfo (and its subclasses) to MCAsmInfo. 2009-08-22 20:48:53 +00:00
MSP430RegisterInfo.cpp Add register-reuse to frame-index register scavenging. When a target uses 2009-10-07 17:12:56 +00:00
MSP430RegisterInfo.h Add register-reuse to frame-index register scavenging. When a target uses 2009-10-07 17:12:56 +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 Use proper target data 2009-10-21 00:10:00 +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 Implement branch folding 2009-10-21 19:17:18 +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.