commit 14000b3cea6b3a44a19b9c80c550d7a2c24b3d31
author Simon Pilgrim <llvm-dev@redking.me.uk> Tue May 24 08:17:50 2016 +0000
committer Simon Pilgrim <llvm-dev@redking.me.uk> Tue May 24 08:17:50 2016 +0000
tree 7f66f2a1a54f88292157b52145da843112a5f28a
parent 9afe57541e4194e947876617ecc993d309214b99

[CostModel][X86][XOP] Added XOP costmodel for BITREVERSE 

Now that we have a nice fast VPPERM solution. Added framework for future intrinsic costs as well.

llvm-svn: 270537

llvm/lib/Target/X86/X86TargetTransformInfo.cpp

diff --git a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
index 28ae96d..508fbe0 100644
--- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
+++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -917,6 +917,49 @@
   return BaseT::getCmpSelInstrCost(Opcode, ValTy, CondTy);
 }
 
+int X86TTIImpl::getIntrinsicInstrCost(Intrinsic::ID IID, Type *RetTy,
+                                      ArrayRef<Type *> Tys, FastMathFlags FMF) {
+  static const CostTblEntry XOPCostTbl[] = {
+    { ISD::BITREVERSE, MVT::v4i64,   4 },
+    { ISD::BITREVERSE, MVT::v8i32,   4 },
+    { ISD::BITREVERSE, MVT::v16i16,  4 },
+    { ISD::BITREVERSE, MVT::v32i8,   4 },
+    { ISD::BITREVERSE, MVT::v2i64,   1 },
+    { ISD::BITREVERSE, MVT::v4i32,   1 },
+    { ISD::BITREVERSE, MVT::v8i16,   1 },
+    { ISD::BITREVERSE, MVT::v16i8,   1 },
+    { ISD::BITREVERSE, MVT::i64,     3 },
+    { ISD::BITREVERSE, MVT::i32,     3 },
+    { ISD::BITREVERSE, MVT::i16,     3 },
+    { ISD::BITREVERSE, MVT::i8,      3 }
+  };
+
+  unsigned ISD = ISD::DELETED_NODE;
+  switch (IID) {
+  default:
+    break;
+  case Intrinsic::bitreverse:
+    ISD = ISD::BITREVERSE;
+    break;
+  }
+
+  // Legalize the type.
+  std::pair<int, MVT> LT = TLI->getTypeLegalizationCost(DL, RetTy);
+  MVT MTy = LT.second;
+
+  // Attempt to lookup cost.
+  if (ST->hasXOP())
+    if (const auto *Entry = CostTableLookup(XOPCostTbl, ISD, MTy))
+      return LT.first * Entry->Cost;
+
+  return BaseT::getIntrinsicInstrCost(IID, RetTy, Tys, FMF);
+}
+
+int X86TTIImpl::getIntrinsicInstrCost(Intrinsic::ID IID, Type *RetTy,
+                                      ArrayRef<Value *> Args, FastMathFlags FMF) {
+  return BaseT::getIntrinsicInstrCost(IID, RetTy, Args, FMF);
+}
+
 int X86TTIImpl::getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index) {
   assert(Val->isVectorTy() && "This must be a vector type");
 
@@ -1320,7 +1363,7 @@
     GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Ptr);
     if (IndexSize < 64 || !GEP)
       return IndexSize;
- 
+
     unsigned NumOfVarIndices = 0;
     Value *Ptrs = GEP->getPointerOperand();
     if (Ptrs->getType()->isVectorTy() && !getSplatValue(Ptrs))