[lld] [llvm] [X86] Use a large-model call for __tls_get_addr (PR #216195)

[Fangrui Song via llvm-commits]

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@@ -595,6 +595,47 @@ void X86AsmPrinter::LowerTlsAddr(X86MCInstLower &MCInstLowering,
             .addReg(0));
   } else if (Is64Bits) {
     bool NeedsPadding = Specifier == X86::S_TLSGD;
+    const MCSymbol *TlsGetAddr = Ctx.getOrCreateSymbol("__tls_get_addr");
+    if (Is64BitsLP64 && getSubtarget().isTargetELF() &&
+        TM.getCodeModel() == CodeModel::Large && TM.isPositionIndependent()) {
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MaskRay wrote:

Agreed that no PIC check is needed.

`__tls_get_addr` is needed when the translation unit can be used by a dlopen shared object. Only `-fpic` may need TLS GD. -fno-pic/-fpie don't.  However, the PIC check may not be needed in this context.


https://github.com/llvm/llvm-project/pull/216195