llvm-project/llvm/lib/Target/MSP430
Chris Lattner 86b7255776 Eliminate getNamed/getUnnamedSection, adding a new and unified getOrCreateSection
instead.

llvm-svn: 77186
2009-07-27 06:17:14 +00:00
..
TargetInfo Factor commonality in triple match routines into helper template for registering 2009-07-26 05:03:33 +00:00
CMakeLists.txt bug 4524: Add MSP430 to the cmake build. 2009-07-09 20:27:09 +00:00
MSP430.h Add new helpers for registering targets. 2009-07-25 06:49:55 +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 Add new helpers for registering targets. 2009-07-25 06:49:55 +00:00
MSP430CallingConv.td Hanle i8 returns 2009-05-03 13:11:48 +00:00
MSP430ISelDAGToDAG.cpp Implement changes from Chris's feedback. 2009-07-08 20:53:28 +00:00
MSP430ISelLowering.cpp Get rid of the Pass+Context magic. 2009-07-22 00:24:57 +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
MSP430InstrFormats.td Dummy MSP430 backend 2009-05-03 12:57:15 +00:00
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
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 Dummy MSP430 backend 2009-05-03 12:57:15 +00:00
MSP430Subtarget.h Propagate CPU string out of SubtargetFeatures 2009-05-23 19:50:50 +00:00
MSP430TargetAsmInfo.cpp Eliminate getNamed/getUnnamedSection, adding a new and unified getOrCreateSection 2009-07-27 06:17:14 +00:00
MSP430TargetAsmInfo.h untangle a TargetAsmInfo hack where ELFTargetAsmInfo would create a 2009-07-26 19:23:28 +00:00
MSP430TargetMachine.cpp Add new helpers for registering targets. 2009-07-25 06:49:55 +00:00
MSP430TargetMachine.h Lift addAssemblyEmitter into LLVMTargetMachine. 2009-07-15 23:34:19 +00:00
Makefile Add TargetInfo libraries for all targets. 2009-07-15 06:35:19 +00:00
README.txt Add TODO list :) 2009-05-03 13:19:24 +00:00

README.txt

//===---------------------------------------------------------------------===//
// 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.