6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-08-02 23:26:31 +00:00
Code Issues Projects Releases Wiki Activity

Implement a DAGCombine in MipsISelLowering.cpp which transforms the following

Browse Source 
pattern:

(add v0, (add v1, abs_lo(tjt))) => (add (add v0, v1), abs_lo(tjt))

"tjt" is a TargetJumpTable node. 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158419 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka
2012-06-13 20:33:18 +00:00
parent e193b32583
commit 8782707f50
3 changed files with 46 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
lib/Target/Mips/MipsISelDAGToDAG.cpp
View File

@@ -335,11 +335,11 @@ SelectAddr(SDNode *Parent, SDValue Addr, SDValue &Base, SDValue &Offset) {
// lui $2, %hi($CPI1_0)
// lwc1 $f0, %lo($CPI1_0)($2)
if (Addr.getOperand(1).getOpcode() == MipsISD::Lo) {
SDValue LoVal = Addr.getOperand(1);
if (isa<ConstantPoolSDNode>(LoVal.getOperand(0)) ||
isa<GlobalAddressSDNode>(LoVal.getOperand(0))) {
SDValue LoVal = Addr.getOperand(1), Opnd0 = LoVal.getOperand(0);
if (isa<ConstantPoolSDNode>(Opnd0) || isa<GlobalAddressSDNode>(Opnd0) ||
isa<JumpTableSDNode>(Opnd0)) {
Base = Addr.getOperand(0);
Offset = LoVal.getOperand(0);
Offset = Opnd0;
return true;
}
}

30
lib/Target/Mips/MipsISelLowering.cpp
View File

@@ -295,6 +295,7 @@ MipsTargetLowering(MipsTargetMachine &TM)
setTargetDAGCombine(ISD::SELECT);
setTargetDAGCombine(ISD::AND);
setTargetDAGCombine(ISD::OR);
setTargetDAGCombine(ISD::ADD);
setMinFunctionAlignment(HasMips64 ? 3 : 2);
@@ -733,6 +734,33 @@ static SDValue PerformORCombine(SDNode *N, SelectionDAG& DAG,
DAG.getConstant(SMSize0, MVT::i32), And0.getOperand(0));
}
static SDValue PerformADDCombine(SDNode *N, SelectionDAG& DAG,
TargetLowering::DAGCombinerInfo &DCI,
const MipsSubtarget* Subtarget) {
// (add v0, (add v1, abs_lo(tjt))) => (add (add v0, v1), abs_lo(tjt))
if (DCI.isBeforeLegalizeOps())
return SDValue();
SDValue Add = N->getOperand(1);
if (Add.getOpcode() != ISD::ADD)
return SDValue();
SDValue Lo = Add.getOperand(1);
if ((Lo.getOpcode() != MipsISD::Lo) ||
(Lo.getOperand(0).getOpcode() != ISD::TargetJumpTable))
return SDValue();
EVT ValTy = N->getValueType(0);
DebugLoc DL = N->getDebugLoc();
SDValue Add1 = DAG.getNode(ISD::ADD, DL, ValTy, N->getOperand(0),
Add.getOperand(0));
return DAG.getNode(ISD::ADD, DL, ValTy, Add1, Lo);
}
SDValue MipsTargetLowering::PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI)
const {
SelectionDAG &DAG = DCI.DAG;
@@ -753,6 +781,8 @@ SDValue MipsTargetLowering::PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI)
return PerformANDCombine(N, DAG, DCI, Subtarget);
case ISD::OR:
return PerformORCombine(N, DAG, DCI, Subtarget);
case ISD::ADD:
return PerformADDCombine(N, DAG, DCI, Subtarget);
}
return SDValue();