Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/lib/Target/BPF/BPFSubtarget.cpp

@@ -0,0 +1,55 @@
+//===-- BPFSubtarget.cpp - BPF Subtarget Information ----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the BPF specific subclass of TargetSubtargetInfo.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BPFSubtarget.h"
+#include "BPF.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/TargetRegistry.h"
+
+using namespace llvm;
+
+#define DEBUG_TYPE "bpf-subtarget"
+
+#define GET_SUBTARGETINFO_TARGET_DESC
+#define GET_SUBTARGETINFO_CTOR
+#include "BPFGenSubtargetInfo.inc"
+
+void BPFSubtarget::anchor() {}
+
+BPFSubtarget &BPFSubtarget::initializeSubtargetDependencies(StringRef CPU,
+                                                            StringRef FS) {
+  initializeEnvironment();
+  initSubtargetFeatures(CPU, FS);
+  return *this;
+}
+
+void BPFSubtarget::initializeEnvironment() {
+  HasJmpExt = false;
+}
+
+void BPFSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
+  if (CPU == "probe")
+    CPU = sys::detail::getHostCPUNameForBPF();
+  if (CPU == "generic" || CPU == "v1")
+    return;
+  if (CPU == "v2") {
+    HasJmpExt = true;
+    return;
+  }
+}
+
+BPFSubtarget::BPFSubtarget(const Triple &TT, const std::string &CPU,
+                           const std::string &FS, const TargetMachine &TM)
+    : BPFGenSubtargetInfo(TT, CPU, FS), InstrInfo(),
+      FrameLowering(initializeSubtargetDependencies(CPU, FS)),
+      TLInfo(TM, *this) {}