llvm-6502/lib/Target/MSP430
Stuart Hastings 3bf9125933 Add a DebugLoc parameter to TargetInstrInfo::InsertBranch(). This
addresses a longstanding deficiency noted in many FIXMEs scattered
across all the targets.

This effectively moves the problem up one level, replacing eleven
FIXMEs in the targets with eight FIXMEs in CodeGen, plus one path
through FastISel where we actually supply a DebugLoc, fixing Radar
7421831.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106243 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-17 22:43:56 +00:00
..
AsmPrinter I got tired of VISIBILITY_HIDDEN colliding with the gcc enum. Rename it 2010-05-11 20:16:09 +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 Add skeleton target-specific SelectionDAGInfo files. 2010-04-16 23:04:22 +00:00
Makefile make -fno-rtti the default unless a directory builds with REQUIRES_RTTI. 2010-01-24 20:43:08 +00:00
MSP430.h Add branch relaxation pass (shamelessly stolen from PPC). 2010-01-15 21:19:05 +00:00
MSP430.td Replace TSFlagsFields and TSFlagsShifts with a simpler TSFlags field. 2010-04-05 03:10:20 +00:00
MSP430BranchSelector.cpp Do folding for indirect branches, where possible 2010-05-01 12:28:21 +00:00
MSP430CallingConv.td
MSP430InstrFormats.td Replace TSFlagsFields and TSFlagsShifts with a simpler TSFlags field. 2010-04-05 03:10:20 +00:00
MSP430InstrInfo.cpp Add a DebugLoc parameter to TargetInstrInfo::InsertBranch(). This 2010-06-17 22:43:56 +00:00
MSP430InstrInfo.h Add a DebugLoc parameter to TargetInstrInfo::InsertBranch(). This 2010-06-17 22:43:56 +00:00
MSP430InstrInfo.td Do folding for indirect branches, where possible 2010-05-01 12:28:21 +00:00
MSP430ISelDAGToDAG.cpp Use const qualifiers with TargetLowering. This eliminates several 2010-04-17 15:26:15 +00:00
MSP430ISelLowering.cpp Implement @llvm.returnaddress. rdar://8015977. 2010-05-22 01:47:14 +00:00
MSP430ISelLowering.h Implement indirect branches on MSP430 2010-05-01 12:04:32 +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 Eliminate SetDirective, and replace it with HasSetDirective. 2010-01-26 20:40:54 +00:00
MSP430MCAsmInfo.h
MSP430RegisterInfo.cpp cleanup 2010-06-02 13:53:17 +00:00
MSP430RegisterInfo.h cleanup 2010-06-02 13:53:17 +00:00
MSP430RegisterInfo.td Replace the SubRegSet tablegen class with a less error-prone mechanism. 2010-05-26 17:27:12 +00:00
MSP430SelectionDAGInfo.cpp Implement a bunch more TargetSelectionDAGInfo infrastructure. 2010-05-11 17:31:57 +00:00
MSP430SelectionDAGInfo.h Implement a bunch more TargetSelectionDAGInfo infrastructure. 2010-05-11 17:31:57 +00:00
MSP430Subtarget.cpp
MSP430Subtarget.h
MSP430TargetMachine.cpp Implement a bunch more TargetSelectionDAGInfo infrastructure. 2010-05-11 17:31:57 +00:00
MSP430TargetMachine.h Implement a bunch more TargetSelectionDAGInfo infrastructure. 2010-05-11 17:31:57 +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.