[mlir][llvm] adds an attribute for the module level assembly

Author: gitoleg

mlir/include/mlir/Dialect/LLVMIR/LLVMDialect.td

@@ -83,6 +83,9 @@ def LLVM_Dialect : Dialect {
       return "llvm.emit_c_interface";
     }
 
+    /// Name of the module level assembly attribute.
+    static StringRef getModuleLevelAsmAttrName() { return "llvm.module_asm"; }
+
     /// Name of the dependent libraries attribute.
     static StringRef getDependentLibrariesAttrName() {
       return "llvm.dependent_libraries";

mlir/lib/Target/LLVMIR/ModuleTranslation.cpp

@@ -2276,6 +2276,10 @@ prepareLLVMModule(Operation *m, llvm::LLVMContext &llvmContext,
     llvmModule->setTargetTriple(
         llvm::Triple(cast<StringAttr>(targetTripleAttr).getValue()));
 
+  if (auto asmAttr =
+          m->getDiscardableAttr(LLVM::LLVMDialect::getModuleLevelAsmAttrName()))
+    llvmModule->setModuleInlineAsm(cast<StringAttr>(asmAttr).getValue());
+
   return llvmModule;
 }
 

mlir/test/Target/LLVMIR/module-asm.mlir

@@ -0,0 +1,5 @@
+// RUN: mlir-translate -mlir-to-llvmir %s | FileCheck %s
+
+module attributes {llvm.module_asm = "foo"} {}
+
+// CHECK: module asm "foo"