[llvm] [PowerPC] Support local-dynamic TLS relocation on AIX (PR #66316)

[via llvm-commits]

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@@ -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
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stephenpeckham wrote:

You only need a single module-handle TOC entry for the entire file.

https://github.com/llvm/llvm-project/pull/66316