[llvm-branch-commits] [lld] [lld][LoongArch] GOT indirection to PC relative optimization. (PR #123743)

[Fangrui Song via llvm-branch-commits]

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@@ -1150,6 +1152,58 @@ void LoongArch::tlsdescToLe(uint8_t *loc, const Relocation &rel,
   }
 }
 
+// Try GOT indirection to PC relative optimization when relaxation is enabled.
+// From:
+//  * pcalau12i $a0, %got_pc_hi20(sym_got)
+//  * ld.w/d    $a0, $a0, %got_pc_lo12(sym_got)
+// To:
+//  * pcalau12i $a0, %pc_hi20(sym)
+//  * addi.w/d  $a0, $a0, %pc_lo12(sym)
+//
+// FIXME: Althouth the optimization has been performed, the GOT entries still
+// exists, similarly to AArch64. Eliminating the entries may be require
+// additional marking in the common code.
+bool LoongArch::tryGotToPCRel(uint8_t *loc, const Relocation &rHi20,
+                              const Relocation &rLo12, uint64_t secAddr) const {
+  if (!rHi20.sym->isDefined() || rHi20.sym->isPreemptible ||
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MaskRay wrote:

We need symbol tests to test each condition here. aarch64-adrp-ldr-got-symbols.s has an example

https://github.com/llvm/llvm-project/pull/123743