Change CostTable model to be global to all targets

Moving the X86CostTable to a common place, so that other back-ends
can share the code. Also simplifying it a bit and commoning up
tables with one and two types on operations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172658 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 41 insertions, 0 deletions

diff --git a/lib/Analysis/TargetTransformInfo.cpp b/lib/Analysis/TargetTransformInfo.cpp
index 3ef74eb..344be71 100644
--- a/lib/Analysis/TargetTransformInfo.cpp
+++ b/lib/Analysis/TargetTransformInfo.cpp
@@ -286,3 +286,44 @@ char NoTTI::ID = 0;
 ImmutablePass *llvm::createNoTargetTransformInfoPass() {
   return new NoTTI();
 }
+
+//======================================= COST TABLES ==
+
+CostTable::CostTable(const CostTableEntry *table, const size_t size, unsigned numTypes)
+  : table(table), size(size), numTypes(numTypes) {
+  assert(table && "missing cost table");
+  assert(size > 0 && "empty cost table");
+}
+
+unsigned CostTable::_findCost(int ISD, MVT *Types) const {
+  for (unsigned i = 0; i < size; ++i) {
+    if (table[i].ISD == ISD) {
+      bool found = true;
+      for (unsigned t=0; t<numTypes; t++) {
+        if (table[i].Types[t] != Types[t]) {
+          found = false;
+          break;
+        }
+      }
+      if (found)
+        return table[i].Cost;
+    }
+  }
+  return COST_NOT_FOUND;
+}
+
+UnaryCostTable::UnaryCostTable(const CostTableEntry *table, const size_t size)
+  : CostTable(table, size, 1) { }
+
+unsigned UnaryCostTable::findCost(int ISD, MVT Type) const {
+  MVT tys[1] = { Type };
+  return _findCost(ISD, tys);
+}
+
+BinaryCostTable::BinaryCostTable(const CostTableEntry *table, const size_t size)
+  : CostTable(table, size, 2) { }
+
+unsigned BinaryCostTable::findCost(int ISD, MVT Type, MVT SrcType) const {
+  MVT tys[2] = { Type, SrcType };
+  return _findCost(ISD, tys);
+}