llvm-6502/lib/Target/Sparc
Hal Finkel 3080d23fde Provide the register scavenger to processFunctionBeforeFrameFinalized
Add the current PEI register scavenger as a parameter to the
processFunctionBeforeFrameFinalized callback.

This change is necessary in order to allow the PowerPC target code to
set the register scavenger frame index after the save-area offset
adjustments performed by processFunctionBeforeFrameFinalized. Only
after these adjustments have been made is it possible to estimate
the size of the stack frame.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177108 91177308-0d34-0410-b5e6-96231b3b80d8
2013-03-14 20:33:40 +00:00
..
MCTargetDesc Clean up assignment of CalleeSaveStackSlotSize: get rid of the default and explicitly set this in every target that needs to change it from the default. 2013-01-23 16:22:04 +00:00
TargetInfo Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
CMakeLists.txt
DelaySlotFiller.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
FPMover.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
LLVMBuild.txt
Makefile
README.txt
Sparc.h
Sparc.td
SparcAsmPrinter.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
SparcCallingConv.td
SparcFrameLowering.cpp Move the eliminateCallFramePseudoInstr method from TargetRegisterInfo 2013-02-21 20:05:00 +00:00
SparcFrameLowering.h Move the eliminateCallFramePseudoInstr method from TargetRegisterInfo 2013-02-21 20:05:00 +00:00
SparcInstrFormats.td
SparcInstrInfo.cpp Use the new script to sort the includes of every file under lib. 2012-12-03 16:50:05 +00:00
SparcInstrInfo.h
SparcInstrInfo.td Move MRI liveouts to Sparc return instructions. 2013-02-05 18:16:58 +00:00
SparcISelDAGToDAG.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
SparcISelLowering.cpp ArrayRefize some code. No functionality change. 2013-03-07 20:33:29 +00:00
SparcISelLowering.h
SparcMachineFunctionInfo.cpp
SparcMachineFunctionInfo.h
SparcRegisterInfo.cpp Move the eliminateCallFramePseudoInstr method from TargetRegisterInfo 2013-02-21 20:05:00 +00:00
SparcRegisterInfo.h Provide the register scavenger to processFunctionBeforeFrameFinalized 2013-03-14 20:33:40 +00:00
SparcRegisterInfo.td
SparcSelectionDAGInfo.cpp
SparcSelectionDAGInfo.h
SparcSubtarget.cpp
SparcSubtarget.h
SparcTargetMachine.cpp Switch TargetTransformInfo from an immutable analysis pass that requires 2013-01-07 01:37:14 +00:00
SparcTargetMachine.h Switch TargetTransformInfo from an immutable analysis pass that requires 2013-01-07 01:37:14 +00:00

To-do
-----

* Keep the address of the constant pool in a register instead of forming its
  address all of the time.
* We can fold small constant offsets into the %hi/%lo references to constant
  pool addresses as well.
* When in V9 mode, register allocate %icc[0-3].
* Add support for isel'ing UMUL_LOHI instead of marking it as Expand.
* Emit the 'Branch on Integer Register with Prediction' instructions.  It's
  not clear how to write a pattern for this though:

float %t1(int %a, int* %p) {
        %C = seteq int %a, 0
        br bool %C, label %T, label %F
T:
        store int 123, int* %p
        br label %F
F:
        ret float undef
}

codegens to this:

t1:
        save -96, %o6, %o6
1)      subcc %i0, 0, %l0
1)      bne .LBBt1_2    ! F
        nop
.LBBt1_1:       ! T
        or %g0, 123, %l0
        st %l0, [%i1]
.LBBt1_2:       ! F
        restore %g0, %g0, %g0
        retl
        nop

1) should be replaced with a brz in V9 mode.

* Same as above, but emit conditional move on register zero (p192) in V9 
  mode.  Testcase:

int %t1(int %a, int %b) {
        %C = seteq int %a, 0
        %D = select bool %C, int %a, int %b
        ret int %D
}

* Emit MULX/[SU]DIVX instructions in V9 mode instead of fiddling 
  with the Y register, if they are faster.

* Codegen bswap(load)/store(bswap) -> load/store ASI

* Implement frame pointer elimination, e.g. eliminate save/restore for 
  leaf fns.
* Fill delay slots

* Implement JIT support