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Restore some "small section" support code, reverting my patch from r76936.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78894 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-08-13 05:41:27 +00:00
parent 86e5f7b6f8
commit e3736f86ca
4 changed files with 59 additions and 6 deletions
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45
lib/Target/Mips/MipsISelLowering.cpp
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@@ -210,6 +210,37 @@ AddLiveIn(MachineFunction &MF, unsigned PReg, TargetRegisterClass *RC)
return VReg;
}
// A address must be loaded from a small section if its size is less than the
// small section size threshold. Data in this section must be addressed using
// gp_rel operator.
bool MipsTargetLowering::IsInSmallSection(unsigned Size) {
return (Size > 0 && (Size <= Subtarget->getSSectionThreshold()));
}
// Discover if this global address can be placed into small data/bss section.
bool MipsTargetLowering::IsGlobalInSmallSection(GlobalValue *GV)
{
const TargetData *TD = getTargetData();
const GlobalVariable *GVA = dyn_cast<GlobalVariable>(GV);
if (!GVA)
return false;
const Type *Ty = GV->getType()->getElementType();
unsigned Size = TD->getTypeAllocSize(Ty);
// if this is a internal constant string, there is a special
// section for it, but not in small data/bss.
if (GVA->hasInitializer() && GV->hasLocalLinkage()) {
Constant *C = GVA->getInitializer();
const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
if (CVA && CVA->isCString())
return false;
}
return IsInSmallSection(Size);
}
// Get fp branch code (not opcode) from condition code.
static Mips::FPBranchCode GetFPBranchCodeFromCond(Mips::CondCode CC) {
if (CC >= Mips::FCOND_F && CC <= Mips::FCOND_NGT)
@@ -485,17 +516,23 @@ LowerSELECT(SDValue Op, SelectionDAG &DAG)
Cond, True, False, CCNode);
}
SDValue MipsTargetLowering::
LowerGlobalAddress(SDValue Op, SelectionDAG &DAG)
{
SDValue MipsTargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) {
// FIXME there isn't actually debug info here
DebugLoc dl = Op.getDebugLoc();
GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
SDValue GA = DAG.getTargetGlobalAddress(GV, MVT::i32);
if (getTargetMachine().getRelocationModel() != Reloc::PIC_) {
SDVTList VTs = DAG.getVTList(MVT::i32);
// %gp_rel relocation
if (!isa<Function>(GV) && IsGlobalInSmallSection(GV)) {
SDValue GPRelNode = DAG.getNode(MipsISD::GPRel, dl, VTs, &GA, 1);
SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(MVT::i32);
return DAG.getNode(ISD::ADD, dl, MVT::i32, GOT, GPRelNode);
}
// %hi/%lo relocation
SDValue HiPart = DAG.getNode(MipsISD::Hi, dl, MVT::i32, GA);
SDValue HiPart = DAG.getNode(MipsISD::Hi, dl, VTs, &GA, 1);
SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, GA);
return DAG.getNode(ISD::ADD, dl, MVT::i32, HiPart, Lo);