1 files changed, 59 insertions, 0 deletions
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblySubtarget.cpp b/llvm/lib/Target/WebAssembly/WebAssemblySubtarget.cpp
new file mode 100644
index 000000000000..196a74565285
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/WebAssemblySubtarget.cpp
@@ -0,0 +1,59 @@
+//===-- WebAssemblySubtarget.cpp - WebAssembly Subtarget Information ------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file implements the WebAssembly-specific subclass of
+/// TargetSubtarget.
+///
+//===----------------------------------------------------------------------===//
+
+#include "WebAssemblySubtarget.h"
+#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
+#include "WebAssemblyInstrInfo.h"
+#include "llvm/Support/TargetRegistry.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "wasm-subtarget"
+
+#define GET_SUBTARGETINFO_CTOR
+#define GET_SUBTARGETINFO_TARGET_DESC
+#include "WebAssemblyGenSubtargetInfo.inc"
+
+WebAssemblySubtarget &
+WebAssemblySubtarget::initializeSubtargetDependencies(StringRef FS) {
+  // Determine default and user-specified characteristics
+
+  if (CPUString.empty())
+    CPUString = "generic";
+
+  ParseSubtargetFeatures(CPUString, FS);
+  return *this;
+}
+
+WebAssemblySubtarget::WebAssemblySubtarget(const Triple &TT,
+                                           const std::string &CPU,
+                                           const std::string &FS,
+                                           const TargetMachine &TM)
+    : WebAssemblyGenSubtargetInfo(TT, CPU, FS), CPUString(CPU),
+      TargetTriple(TT), FrameLowering(),
+      InstrInfo(initializeSubtargetDependencies(FS)), TSInfo(),
+      TLInfo(TM, *this) {}
+
+bool WebAssemblySubtarget::enableAtomicExpand() const {
+  // If atomics are disabled, atomic ops are lowered instead of expanded
+  return hasAtomics();
+}
+
+bool WebAssemblySubtarget::enableMachineScheduler() const {
+  // Disable the MachineScheduler for now. Even with ShouldTrackPressure set and
+  // enableMachineSchedDefaultSched overridden, it appears to have an overall
+  // negative effect for the kinds of register optimizations we're doing.
+  return false;
+}
+
+bool WebAssemblySubtarget::useAA() const { return true; }