llvm-6502/lib/Target/MSP430
Daniel Sanders 6d9e62f432 Make each target map all inline assembly memory constraints to InlineAsm::Constraint_m. NFC.
Summary:
This is instead of doing this in target independent code and is the last
non-functional change before targets begin to distinguish between
different memory constraints when selecting code for the ISD::INLINEASM
node.

Next, each target will individually move away from the idea that all
memory constraints behave like 'm'.

Subscribers: jholewinski, llvm-commits

Differential Revision: http://reviews.llvm.org/D8173


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232373 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-16 13:13:41 +00:00
..
InstPrinter
MCTargetDesc TableGen: Use 'enum : uint64_t' for feature flags to fix -Wmicrosoft 2015-03-09 20:23:14 +00:00
TargetInfo
CMakeLists.txt
LLVMBuild.txt
Makefile
MSP430.h
MSP430.td
MSP430AsmPrinter.cpp std::unique_ptrify the MCStreamer argument to createAsmPrinter 2015-01-18 20:29:04 +00:00
MSP430BranchSelector.cpp
MSP430CallingConv.td
MSP430FrameLowering.cpp
MSP430FrameLowering.h
MSP430InstrFormats.td
MSP430InstrInfo.cpp
MSP430InstrInfo.h
MSP430InstrInfo.td
MSP430ISelDAGToDAG.cpp Recommit r232027 with PR22883 fixed: Add infrastructure for support of multiple memory constraints. 2015-03-13 12:45:09 +00:00
MSP430ISelLowering.cpp getRegForInlineAsmConstraint wants to use TargetRegisterInfo for 2015-02-26 22:38:43 +00:00
MSP430ISelLowering.h Make each target map all inline assembly memory constraints to InlineAsm::Constraint_m. NFC. 2015-03-16 13:13:41 +00:00
MSP430MachineFunctionInfo.cpp
MSP430MachineFunctionInfo.h
MSP430MCInstLower.cpp Remove unused header. 2015-01-29 23:46:39 +00:00
MSP430MCInstLower.h
MSP430RegisterInfo.cpp
MSP430RegisterInfo.h Have getCalleeSavedRegs take a non-null MachineFunction all the 2015-03-11 21:41:28 +00:00
MSP430RegisterInfo.td
MSP430SelectionDAGInfo.cpp
MSP430SelectionDAGInfo.h
MSP430Subtarget.cpp 80-column fixup. 2015-03-03 17:54:39 +00:00
MSP430Subtarget.h Move DataLayout back to the TargetMachine from TargetSubtargetInfo 2015-01-26 19:03:15 +00:00
MSP430TargetMachine.cpp Move the DataLayout to the generic TargetMachine, making it mandatory. 2015-03-12 00:07:24 +00:00
MSP430TargetMachine.h Move the DataLayout to the generic TargetMachine, making it mandatory. 2015-03-12 00:07:24 +00:00
README.txt Test commit to see if it triggers an email to llvm-commits. No change. 2015-02-06 21:33:08 +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.