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Support PIC loading of constant pool entries

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89863 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes 2009-11-25 12:17:58 +00:00
parent 5b512fe527
commit d71cebf575
3 changed files with 21 additions and 14 deletions
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17
lib/Target/Mips/MipsISelDAGToDAG.cpp
View File

@ -144,6 +144,7 @@ SelectAddr(SDValue Op, SDValue Addr, SDValue &Offset, SDValue &Base)
// on PIC code Load GA
if (TM.getRelocationModel() == Reloc::PIC_) {
if ((Addr.getOpcode() == ISD::TargetGlobalAddress) ||
(Addr.getOpcode() == ISD::TargetConstantPool) ||
(Addr.getOpcode() == ISD::TargetJumpTable)){
Base = CurDAG->getRegister(Mips::GP, MVT::i32);
Offset = Addr;
@ -174,23 +175,21 @@ SelectAddr(SDValue Op, SDValue Addr, SDValue &Offset, SDValue &Base)
}
// When loading from constant pools, load the lower address part in
// the instruction itself. Instead of:
// the instruction itself. Example, instead of:
// lui $2, %hi($CPI1_0)
// addiu $2, $2, %lo($CPI1_0)
// lwc1 $f0, 0($2)
// Generate:
// lui $2, %hi($CPI1_0)
// lwc1 $f0, %lo($CPI1_0)($2)
if (Addr.getOperand(0).getOpcode() == MipsISD::Hi &&
if ((Addr.getOperand(0).getOpcode() == MipsISD::Hi ||
Addr.getOperand(0).getOpcode() == ISD::LOAD) &&
Addr.getOperand(1).getOpcode() == MipsISD::Lo) {
SDValue LoVal = Addr.getOperand(1);
if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(
LoVal.getOperand(0))) {
if (!CP->getOffset()) {
Base = Addr.getOperand(0);
Offset = LoVal.getOperand(0);
return true;
}
if (dyn_cast<ConstantPoolSDNode>(LoVal.getOperand(0))) {
Base = Addr.getOperand(0);
Offset = LoVal.getOperand(0);
return true;
}
}
}

16
lib/Target/Mips/MipsISelLowering.cpp
View File

@ -563,8 +563,6 @@ LowerConstantPool(SDValue Op, SelectionDAG &DAG)
SDValue ResNode;
ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
Constant *C = N->getConstVal();
SDValue CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment(),
N->getOffset(), MipsII::MO_ABS_HILO);
// FIXME there isn't actually debug info here
DebugLoc dl = Op.getDebugLoc();
@ -577,11 +575,21 @@ LowerConstantPool(SDValue Op, SelectionDAG &DAG)
// SDValue GPRelNode = DAG.getNode(MipsISD::GPRel, MVT::i32, CP);
// SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(MVT::i32);
// ResNode = DAG.getNode(ISD::ADD, MVT::i32, GOT, GPRelNode);
//} else { // %hi/%lo relocation
if (getTargetMachine().getRelocationModel() != Reloc::PIC_) {
SDValue CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment(),
N->getOffset(), MipsII::MO_ABS_HILO);
SDValue HiPart = DAG.getNode(MipsISD::Hi, dl, MVT::i32, CP);
SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, CP);
ResNode = DAG.getNode(ISD::ADD, dl, MVT::i32, HiPart, Lo);
//}
} else {
SDValue CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment(),
N->getOffset(), MipsII::MO_GOT);
SDValue Load = DAG.getLoad(MVT::i32, dl, DAG.getEntryNode(),
CP, NULL, 0);
SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, CP);
ResNode = DAG.getNode(ISD::ADD, dl, MVT::i32, Load, Lo);
}
return ResNode;
}

2
test/CodeGen/Mips/2009-11-16-CstPoolLoad.ll
View File

@ -4,7 +4,7 @@ target triple = "mips-unknown-linux"
define float @h() nounwind readnone {
entry:
; CHECK: lui $2, %hi($CPI1_0)
; CHECK: lw $2, %got($CPI1_0)($gp)
; CHECK: lwc1 $f0, %lo($CPI1_0)($2)
ret float 0x400B333340000000
}