Lower reloc.none in Global ISel

Author: mysterymath

llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp

@@ -2654,6 +2654,16 @@ bool IRTranslator::translateKnownIntrinsic(const CallInst &CI, Intrinsic::ID ID,
   case Intrinsic::experimental_convergence_entry:
   case Intrinsic::experimental_convergence_loop:
     return translateConvergenceControlIntrinsic(CI, ID, MIRBuilder);
+  case Intrinsic::reloc_none: {
+    Metadata *MD = cast<MetadataAsValue>(CI.getArgOperand(0))->getMetadata();
+    StringRef SymbolName = cast<MDString>(MD)->getString();
+    auto *M = const_cast<Module *>(CI.getModule());
+    auto *RelocSymbol = cast<GlobalVariable>(
+        M->getOrInsertGlobal(SymbolName, StructType::create(M->getContext())));
+    MIRBuilder.buildInstr(TargetOpcode::RELOC_NONE)
+        .addGlobalAddress(RelocSymbol);
+    return true;
+  }
   }
   return false;
 }

llvm/test/CodeGen/X86/GlobalISel/reloc-none.ll

@@ -0,0 +1,14 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=x86_64-linux-gnu -global-isel -verify-machineinstrs < %s -o - | FileCheck %s --check-prefix=CHECK
+
+define void @test_reloc_none() {
+; CHECK-LABEL: test_reloc_none:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:  .Lreloc_none0:
+; CHECK-NEXT:    .reloc .Lreloc_none0, BFD_RELOC_NONE, foo
+; CHECK-NEXT:    retq
+  call void @llvm.reloc.none(metadata !"foo")
+  ret void
+}
+
+declare void @llvm.reloc.none(metadata)