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[XCore] Move lowering of thread local storage to a separate pass.

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Thread local storage is not supported by the XMOS linker so we handle
thread local variables by lowering the variable to an array of n elements
(where n is the number of hardware threads per core, currently 8
for all XMOS devices) indexed by the the current thread ID.

Previously this lowering was spread across the XCoreISelLowering and the
XCoreAsmPrinter classes. Moving this to a separate pass should be much
cleaner.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181124 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Osborne
2013-05-04 17:01:55 +00:00
parent effc16bb49
commit 597432fbe5
6 changed files with 158 additions and 55 deletions
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lib/Target/XCore/XCoreISelLowering.cpp
-42
View File
@@ -120,9 +120,6 @@ XCoreTargetLowering::XCoreTargetLowering(XCoreTargetMachine &XTM)
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
setOperationAction(ISD::BlockAddress, MVT::i32 , Custom);
// Thread Local Storage
setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
// Conversion of i64 -> double produces constantpool nodes
setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
@@ -172,7 +169,6 @@ LowerOperation(SDValue Op, SelectionDAG &DAG) const {
switch (Op.getOpcode())
{
case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
case ISD::BR_JT: return LowerBR_JT(Op, DAG);
@@ -255,44 +251,6 @@ static inline SDValue BuildGetId(SelectionDAG &DAG, DebugLoc dl) {
DAG.getConstant(Intrinsic::xcore_getid, MVT::i32));
}
static inline bool isZeroLengthArray(Type *Ty) {
ArrayType *AT = dyn_cast_or_null<ArrayType>(Ty);
return AT && (AT->getNumElements() == 0);
}
SDValue XCoreTargetLowering::
LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const
{
// FIXME there isn't really debug info here
DebugLoc dl = Op.getDebugLoc();
// transform to label + getid() * size
const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i32);
const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
if (!GVar) {
// If GV is an alias then use the aliasee to determine size
if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal());
}
if (!GVar) {
llvm_unreachable("Thread local object not a GlobalVariable?");
}
Type *Ty = cast<PointerType>(GV->getType())->getElementType();
if (!Ty->isSized() || isZeroLengthArray(Ty)) {
#ifndef NDEBUG
errs() << "Size of thread local object " << GVar->getName()
<< " is unknown\n";
#endif
llvm_unreachable(0);
}
SDValue base = getGlobalAddressWrapper(GA, GV, DAG);
const DataLayout *TD = TM.getDataLayout();
unsigned Size = TD->getTypeAllocSize(Ty);
SDValue offset = DAG.getNode(ISD::MUL, dl, MVT::i32, BuildGetId(DAG, dl),
DAG.getConstant(Size, MVT::i32));
return DAG.getNode(ISD::ADD, dl, MVT::i32, base, offset);
}
SDValue XCoreTargetLowering::
LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const
{