================
@@ -3412,13 +3416,23 @@ SDValue
PPCTargetLowering::LowerGlobalTLSAddressAIX(SDValue Op,
return DAG.getNode(PPCISD::ADD_TLS, dl, PtrVT, TLSReg, VariableOffset);
}
- // Only Local-Exec, Initial-Exec and General-Dynamic TLS models are currently
- // supported models. If Local- or Initial-exec are not possible or specified,
- // all GlobalTLSAddress nodes are lowered using the general-dynamic model.
- // We need to generate two TOC entries, one for the variable offset, one for
- // the region handle. The global address for the TOC entry of the region
- // handle is created with the MO_TLSGDM_FLAG flag and the global address
- // for the TOC entry of the variable offset is created with MO_TLSGD_FLAG.
+ if (Model == TLSModel::LocalDynamic) {
+ // For local-dynamic on AIX, we need to generate two TOC entries, one for
+ // the variable offset, the other for the module handle. The module handle
+ // is encapsulated inside the TLSLD_AIX pseudo node, and will be expanded
by
+ // PPCTLSDynamicCall.
+ SDValue VariableOffsetTGA =
+ DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, PPCII::MO_TLSLD_FLAG);
+ SDValue VariableOffset = getTOCEntry(DAG, dl, VariableOffsetTGA);
----------------
orcguru wrote:
There is a blocker which limits FLAG bit size to be 12:
```
llvm/include/llvm/CodeGen/MachineOperand.h
...
unsigned SubReg_TargetFlags : 12;
...
void setTargetFlags(unsigned F) {
assert(!isReg() && "Register operands can't have target flags");
SubReg_TargetFlags = F;
assert(SubReg_TargetFlags == F && "Target flags out of range");
}
```
Currently PPCII::TOF is already full. I'm afraid this will be a FIXME...
https://github.com/llvm/llvm-project/pull/66316
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