[clang] [llvm] [PowerPC][AIX] 64-bit large code-model support for toc-data (PR #90619)

[Chen Zheng via cfe-commits]

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@@ -6167,16 +6166,12 @@ void PPCDAGToDAGISel::Select(SDNode *N) {
     SDNode *Tmp = CurDAG->getMachineNode(
         isPPC64 ? PPC::ADDIStocHA8 : PPC::ADDIStocHA, dl, VT, TOCbase, GA);
 
-    // On AIX if the symbol has the toc-data attribute it will be defined
-    // in the TOC entry, so we use an ADDItocL similar to the medium code
-    // model ELF abi.
+    // On AIX, if the symbol has the toc-data attribute it will be defined
+    // in the TOC entry, so we use an ADDItocL/ADDItocL8.
     if (isAIXABI && hasTocDataAttr(GA)) {
-      if (isPPC64)
-        report_fatal_error(
-            "64-bit large code model toc-data not yet supported");
-
-      ReplaceNode(N, CurDAG->getMachineNode(PPC::ADDItocL, dl, VT,
-                                            SDValue(Tmp, 0), GA));
+      ReplaceNode(
+          N, CurDAG->getMachineNode(isPPC64 ? PPC::ADDItocL8 : PPC::ADDItocL,
+                                    dl, VT, SDValue(Tmp, 0), GA));
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chenzheng1030 wrote:

nit: I suggest to add an assert like `assert(!isPPC64 && ...)` before line 6188 which assumes 32-bit linux/aix are already handled, so it uses `ADDItocL8` directly.

https://github.com/llvm/llvm-project/pull/90619