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Use PC relative ldr to load from a constantpool in Thumb mode.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33484 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-01-24 08:53:17 +00:00
parent 2b7218218f
commit 012f2d97b7
3 changed files with 25 additions and 9 deletions
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3
lib/Target/ARM/ARMConstantIslandPass.cpp
View File

@ -245,6 +245,9 @@ void ARMConstantIslands::InitialFunctionScan(MachineFunction &Fn,
case ARMII::AddrModeT4:
MaxOffs = 1 << (5+2);
break;
case ARMII::AddrModeTs:
MaxOffs = 1 << (8+2);
break;
}
// Remember that this is a user of a CP entry.

25
lib/Target/ARM/ARMISelDAGToDAG.cpp
View File

@ -380,6 +380,9 @@ ARMDAGToDAGISel::SelectThumbAddrModeRI5(SDOperand Op, SDOperand N,
SDOperand TmpBase, TmpOffImm;
if (SelectThumbAddrModeSP(Op, N, TmpBase, TmpOffImm))
return false; // We want to select tLDRspi / tSTRspi instead.
if (N.getOpcode() == ARMISD::Wrapper &&
N.getOperand(0).getOpcode() == ISD::TargetConstantPool)
return false; // We want to select tLDRpci instead.
}
if (N.getOpcode() != ISD::ADD) {
@ -505,14 +508,20 @@ SDNode *ARMDAGToDAGISel::Select(SDOperand Op) {
SDOperand CPIdx =
CurDAG->getTargetConstantPool(ConstantInt::get(Type::Int32Ty, Val),
TLI.getPointerTy());
SDOperand Ops[] = {
CPIdx,
CurDAG->getRegister(0, MVT::i32),
CurDAG->getTargetConstant(0, MVT::i32),
CurDAG->getEntryNode()
};
SDNode *ResNode =
CurDAG->getTargetNode(ARM::LDR, MVT::i32, MVT::Other, Ops, 4);
SDNode *ResNode;
if (Subtarget->isThumb())
ResNode = CurDAG->getTargetNode(ARM::tLDRpci, MVT::i32, MVT::Other,
CPIdx, CurDAG->getEntryNode());
else {
SDOperand Ops[] = {
CPIdx,
CurDAG->getRegister(0, MVT::i32),
CurDAG->getTargetConstant(0, MVT::i32),
CurDAG->getEntryNode()
};
ResNode = CurDAG->getTargetNode(ARM::LDR, MVT::i32, MVT::Other, Ops, 4);
}
ReplaceUses(Op, SDOperand(ResNode, 0));
return NULL;
}

6
lib/Target/ARM/ARMInstrThumb.td
View File

@ -220,10 +220,14 @@ def tLDRSH : TI2<(ops GPR:$dst, t_addrmode_rr:$addr),
"ldrsh $dst, $addr",
[(set GPR:$dst, (sextloadi16 t_addrmode_rr:$addr))]>;
// def tLDRpci
def tLDRspi : TIs<(ops GPR:$dst, t_addrmode_sp:$addr),
"ldr $dst, $addr",
[(set GPR:$dst, (load t_addrmode_sp:$addr))]>;
// Load tconstpool
def tLDRpci : TIs<(ops GPR:$dst, i32imm:$addr),
"ldr $dst, $addr",
[(set GPR:$dst, (load (ARMWrapper tconstpool:$addr)))]>;
} // isLoad
let isStore = 1 in {