Prevent LoopVectorizer and SLPVectorizer running if the target has no vector registers.

[oota-llvm.git] / lib / Target / XCore / XCoreTargetTransformInfo.cpp

diff --git a/lib/Target/XCore/XCoreTargetTransformInfo.cpp b/lib/Target/XCore/XCoreTargetTransformInfo.cpp
new file mode 100644 (file)
index 0000000..4862138
--- /dev/null
+++ b/lib/Target/XCore/XCoreTargetTransformInfo.cpp
@@ -0,0 +1,85 @@
+//===-- XCoreTargetTransformInfo.cpp - XCore specific TTI pass ----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file implements a TargetTransformInfo analysis pass specific to the
+/// XCore target machine. It uses the target's detailed information to provide
+/// more precise answers to certain TTI queries, while letting the target
+/// independent and default TTI implementations handle the rest.
+///
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "xcoretti"
+#include "XCore.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/CostTable.h"
+using namespace llvm;
+
+// Declare the pass initialization routine locally as target-specific passes
+// don't havve a target-wide initialization entry point, and so we rely on the
+// pass constructor initialization.
+namespace llvm {
+void initializeXCoreTTIPass(PassRegistry &);
+}
+
+namespace {
+
+class XCoreTTI : public ImmutablePass, public TargetTransformInfo {
+  const XCoreTargetMachine *TM;
+
+public:
+  XCoreTTI() : ImmutablePass(ID), TM(0) {
+    llvm_unreachable("This pass cannot be directly constructed");
+  }
+
+  XCoreTTI(const XCoreTargetMachine *TM)
+      : ImmutablePass(ID), TM(TM) {
+    initializeXCoreTTIPass(*PassRegistry::getPassRegistry());
+  }
+
+  virtual void initializePass() {
+    pushTTIStack(this);
+  }
+
+  virtual void finalizePass() {
+    popTTIStack();
+  }
+
+  virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+    TargetTransformInfo::getAnalysisUsage(AU);
+  }
+
+  static char ID;
+
+  virtual void *getAdjustedAnalysisPointer(const void *ID) {
+    if (ID == &TargetTransformInfo::ID)
+      return (TargetTransformInfo*)this;
+    return this;
+  }
+
+  unsigned getNumberOfRegisters(bool Vector) const {
+    if (Vector) {
+       return 0;
+    }
+    return 12;
+  }
+};
+
+} // end anonymous namespace
+
+INITIALIZE_AG_PASS(XCoreTTI, TargetTransformInfo, "xcoretti",
+                   "XCore Target Transform Info", true, true, false)
+char XCoreTTI::ID = 0;
+
+
+ImmutablePass *
+llvm::createXCoreTargetTransformInfoPass(const XCoreTargetMachine *TM) {
+  return new XCoreTTI(TM);
+}