[CIR][CIRGen][builtin][X86] handle _mm_lfence (#1474)

I realized I committed a new file with CRLF before. Really sorry about
that >_<

Related: #1404

Author: FantasqueX

clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp

@@ -105,5 +105,13 @@ mlir::Value CIRGenFunction::emitX86BuiltinExpr(unsigned BuiltinID,
             voidTy, Ops[0])
         .getResult();
   }
+  case X86::BI_mm_lfence: {
+    mlir::Type voidTy = cir::VoidType::get(&getMLIRContext());
+    return builder
+        .create<cir::LLVMIntrinsicCallOp>(
+            getLoc(E->getExprLoc()), builder.getStringAttr("x86.sse2.lfence"),
+            voidTy)
+        .getResult();
+  }
   }
 }

clang/test/CIR/CodeGen/AArch64/neon.c

@@ -11,7 +11,7 @@
 
 // REQUIRES: aarch64-registered-target || arm-registered-target
 
-// This test mimics clang/test/CodeGen/aarch64-neon-intrinsics.c, which eventually
+// This test mimics clang/test/CodeGen/AArch64/neon-intrinsics.c, which eventually
 // CIR shall be able to support fully. Since this is going to take some time to converge,
 // the unsupported/NYI code is commented out, so that we can incrementally improve this.
 // The NYI filecheck used contains the LLVM output from OG codegen that should guide the

clang/test/CIR/CodeGen/X86/builtins-x86.c

@@ -1,13 +1,23 @@
-// Global variables of intergal types
-// RUN: %clang_cc1 -triple x86_64-unknown-linux -Wno-implicit-function-declaration -fclangir -emit-cir -o %t.cir %s
-// RUN: FileCheck --check-prefix=CIR --input-file=%t.cir %s
-// RUN: %clang_cc1 -triple x86_64-unknown-linux -Wno-implicit-function-declaration -fclangir -emit-llvm -o %t.ll %s
-// RUN: FileCheck --check-prefix=LLVM --input-file=%t.ll %s
-
-void test_mm_clflush(const void* tmp_vCp) {
-  // CIR-LABEL: test_mm_clflush
-  // LLVM-LABEL: test_mm_clflush
-  _mm_clflush(tmp_vCp);
-  // CIR: {{%.*}} = cir.llvm.intrinsic "x86.sse2.clflush" {{%.*}} : (!cir.ptr<!void>) -> !void
-  // LLVM: call void @llvm.x86.sse2.clflush(ptr {{%.*}})
-}
+// RUN: %clang_cc1 -triple x86_64-unknown-linux -Wno-implicit-function-declaration -fclangir -emit-cir -o %t.cir %s
+// RUN: FileCheck --check-prefix=CIR --input-file=%t.cir %s
+// RUN: %clang_cc1 -triple x86_64-unknown-linux -Wno-implicit-function-declaration -fclangir -emit-llvm -o %t.ll %s
+// RUN: FileCheck --check-prefix=LLVM --input-file=%t.ll %s
+
+// This test mimics clang/test/CodeGen/builtins-x86.c, which eventually
+// CIR shall be able to support fully.
+
+void test_mm_clflush(const void* tmp_vCp) {
+  // CIR-LABEL: test_mm_clflush
+  // LLVM-LABEL: test_mm_clflush
+  _mm_clflush(tmp_vCp);
+  // CIR: {{%.*}} = cir.llvm.intrinsic "x86.sse2.clflush" {{%.*}} : (!cir.ptr<!void>) -> !void
+  // LLVM: call void @llvm.x86.sse2.clflush(ptr {{%.*}})
+}
+
+void test_mm_lfence() {
+  // CIR-LABEL: test_mm_lfence
+  // LLVM-LABEL: test_mm_lfence
+  _mm_lfence();
+  // CIR: {{%.*}} = cir.llvm.intrinsic "x86.sse2.lfence" : () -> !void
+  // LLVM: call void @llvm.x86.sse2.lfence()
+}