Initial checkin of the new "fast" instruction selection support. See

the comments in FastISelEmitter.cpp for details on what this is.
This is currently experimental and unusable.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54751 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 38 insertions, 0 deletions

diff --git a/utils/TableGen/FastISelEmitter.h b/utils/TableGen/FastISelEmitter.h
new file mode 100644
index 0000000000..f34ece81b9
--- /dev/null
+++ b/utils/TableGen/FastISelEmitter.h
@@ -0,0 +1,38 @@
+//===- FastISelEmitter.h - Generate an instruction selector -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This tablegen backend emits a "fast" instruction selector.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef FASTISEL_EMITTER_H
+#define FASTISEL_EMITTER_H
+
+#include "TableGenBackend.h"
+#include "CodeGenDAGPatterns.h"
+#include <set>
+
+namespace llvm {
+
+/// FastISelEmitter - The top-level class which coordinates construction
+/// and emission of the instruction selector.
+///
+class FastISelEmitter : public TableGenBackend {
+  RecordKeeper &Records;
+  CodeGenDAGPatterns CGP;
+public:
+  explicit FastISelEmitter(RecordKeeper &R) : Records(R), CGP(R) {}
+
+  // run - Output the isel, returning true on failure.
+  void run(std::ostream &OS);
+};
+
+} // End llvm namespace
+
+#endif