Avoid dependency between TableGen and CodeGen

Duplicate a few common definitions between DFAPacketizer.cpp and
DFAPacketizerEmitter.cpp to avoid including files from CodeGen
in TableGen.

llvm-svn: 253820

1 files changed, 46 insertions, 1 deletions

diff --git a/llvm/utils/TableGen/DFAPacketizerEmitter.cpp b/llvm/utils/TableGen/DFAPacketizerEmitter.cpp
index f04cb23f17b..77afff7ab5c 100644
--- a/llvm/utils/TableGen/DFAPacketizerEmitter.cpp
+++ b/llvm/utils/TableGen/DFAPacketizerEmitter.cpp
@@ -21,7 +21,6 @@
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringExtras.h"
-#include "llvm/CodeGen/DFAPacketizerDefs.h"
 #include "llvm/TableGen/Record.h"
 #include "llvm/TableGen/TableGenBackend.h"
 #include "llvm/Support/Debug.h"
@@ -31,6 +30,52 @@
 #include <queue>
 using namespace llvm;
 
+// --------------------------------------------------------------------
+// Definitions shared between DFAPacketizer.cpp and DFAPacketizerEmitter.cpp
+
+// DFA_MAX_RESTERMS * DFA_MAX_RESOURCES must fit within sizeof DFAInput.
+// This is verified in DFAPacketizer.cpp:DFAPacketizer::DFAPacketizer.
+//
+// e.g. terms x resource bit combinations that fit in uint32_t:
+//      4 terms x 8  bits = 32 bits
+//      3 terms x 10 bits = 30 bits
+//      2 terms x 16 bits = 32 bits
+//
+// e.g. terms x resource bit combinations that fit in uint64_t:
+//      8 terms x 8  bits = 64 bits
+//      7 terms x 9  bits = 63 bits
+//      6 terms x 10 bits = 60 bits
+//      5 terms x 12 bits = 60 bits
+//      4 terms x 16 bits = 64 bits <--- current
+//      3 terms x 21 bits = 63 bits
+//      2 terms x 32 bits = 64 bits
+//
+#define DFA_MAX_RESTERMS        4   // The max # of AND'ed resource terms.
+#define DFA_MAX_RESOURCES       16  // The max # of resource bits in one term.
+
+typedef uint64_t                DFAInput;
+typedef int64_t                 DFAStateInput;
+#define DFA_TBLTYPE             "int64_t" // For generating DFAStateInputTable.
+
+namespace {
+  DFAInput addDFAFuncUnits(DFAInput Inp, unsigned FuncUnits) {
+    return (Inp << DFA_MAX_RESOURCES) | FuncUnits;
+  }
+
+  /// Return the DFAInput for an instruction class input vector.
+  /// This function is used in both DFAPacketizer.cpp and in
+  /// DFAPacketizerEmitter.cpp.
+  DFAInput getDFAInsnInput(const std::vector<unsigned> &InsnClass) {
+    DFAInput InsnInput = 0;
+    assert ((InsnClass.size() <= DFA_MAX_RESTERMS) &&
+            "Exceeded maximum number of DFA terms");
+    for (auto U : InsnClass)
+      InsnInput = addDFAFuncUnits(InsnInput, U);
+    return InsnInput;
+  }
+}
+// --------------------------------------------------------------------
+
 #ifndef NDEBUG
 // To enable debugging, run llvm-tblgen with: "-debug-only dfa-emitter".
 //