[lld] [lld][LoongArch] Support TLSDESC GD/LD to IE/LE (PR #123715)

[Zhaoxin Yang via llvm-commits]

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@@ -1088,6 +1193,47 @@ void LoongArch::relocateAlloc(InputSectionBase &sec, uint8_t *buf) const {
         tlsIeToLe(loc, rel, val);
       }
       continue;
+    case RE_LOONGARCH_RELAX_TLS_GD_TO_IE_PAGE_PC:
+      if (rel.type == R_LARCH_TLS_DESC_PC_HI20) {
+        // LoongArch does not support TLSDESC GD/LD to LE/IE optimization in the
+        // extreme code model. In these cases, the relocs are as follows:
+        //
+        //  * i   -- R_LARCH_TLS_DESC_PC_HI20
+        //  * i+1 -- R_LARCH_TLS_DESC_PC_LO12
+        //  * i+2 -- R_LARCH_TLS_DESC64_PC_LO20
+        //  * i+3 -- R_LARCH_TLS_DESC64_PC_HI12
+        isExtreme =
+            (i + 2 < size && relocs[i + 2].type == R_LARCH_TLS_DESC64_PC_LO20);
+      }
+      [[fallthrough]];
+    case R_RELAX_TLS_GD_TO_IE_ABS:
+      if (isExtreme) {
+        if (rel.type == R_LARCH_TLS_DESC_CALL)
+          continue;
+        rel.expr = getRelExpr(rel.type, *rel.sym, loc);
+        val = SignExtend64(sec.getRelocTargetVA(ctx, rel, secAddr + rel.offset),
+                           bits);
+        relocateNoSym(loc, rel.type, val);
+      } else {
+        tlsdescToIe(loc, rel, val);
+      }
+      continue;
+    case R_RELAX_TLS_GD_TO_LE:
+      if (rel.type == R_LARCH_TLS_DESC_PC_HI20) {
+        isExtreme =
+            (i + 2 < size && relocs[i + 2].type == R_LARCH_TLS_DESC64_PC_LO20);
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ylzsx wrote:

Thanks, I will remove it.

https://github.com/llvm/llvm-project/pull/123715