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

[Ting Wang via llvm-commits]

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@@ -660,15 +671,17 @@ void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI,
          "GETtls[ld]ADDR[32] must read GPR3");
 
   if (Subtarget->isAIXABI()) {
-    // On AIX, the variable offset should already be in R4 and the region handle
-    // should already be in R3.
-    // For TLSGD, which currently is the only supported access model, we only
-    // need to generate an absolute branch to .__tls_get_addr.
+    // On AIX, for TLSGD the variable offset should already be in R4 and the
+    // region handle should already be in R3, need to generate an absolute
+    // branch to .__tls_get_addr. For TLSLD the module handle should already be
+    // in R3, need to generate branch to .__tls_get_mod.
     Register VarOffsetReg = Subtarget->isPPC64() ? PPC::X4 : PPC::R4;
     (void)VarOffsetReg;
-    assert(MI->getOperand(2).isReg() &&
-           MI->getOperand(2).getReg() == VarOffsetReg &&
-           "GETtls[ld]ADDR[32] must read GPR4");
+    assert(MI->getOpcode() == PPC::GETtlsMOD32AIX ||
+           MI->getOpcode() == PPC::GETtlsMOD64AIX ||
+           (MI->getOperand(2).isReg() &&
+            MI->getOperand(2).getReg() == VarOffsetReg) &&
+               "GETtls[ld]ADDR[32] must read GPR4");
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orcguru wrote:

To be honest, I looked up the C operator precedence. My intention here is to skip the assert check for those two opcodes. On the other hand, I think to be a good programmer for LLVM, maybe I should follow your suggestion since I didn't find similar usage like this...

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