[llvm-commits] [llvm] r171180 - in /llvm/trunk/lib/Target/X86: X86ISelLowering.cpp X86ISelLowering.h

[Nadav Rotem]

Author: nadav
Date: Fri Dec 28 02:19:03 2012
New Revision: 171180

URL: http://llvm.org/viewvc/llvm-project?rev=171180&view=rev
Log:
CostModel: initial checkin for code that estimates the cost of special shuffles.

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
    llvm/trunk/lib/Target/X86/X86ISelLowering.h

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=171180&r1=171179&r2=171180&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Fri Dec 28 02:19:03 2012
@@ -18237,3 +18237,19 @@
   return VectorTargetTransformImpl::getCastInstrCost(Opcode, Dst, Src);
 }
 
+
+unsigned X86VectorTargetTransformInfo::getShuffleCost(ShuffleKind Kind, Type *Tp,
+                                                      int Index) const {
+  // We only estimate the cost of reverse shuffles.
+  if (Kind != Reverse)
+    return VectorTargetTransformImpl::getShuffleCost(Kind, Tp, Index);
+
+  std::pair<unsigned, MVT> LT = getTypeLegalizationCost(Tp);
+  unsigned Cost = 1;
+  if (LT.second.getSizeInBits() > 128)
+    Cost = 3; // Extract + insert + copy.
+
+  // Multiple by the number of parts.
+  return Cost * LT.first;
+}
+

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.h?rev=171180&r1=171179&r2=171180&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.h (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.h Fri Dec 28 02:19:03 2012
@@ -973,6 +973,8 @@
 
     virtual unsigned getCastInstrCost(unsigned Opcode, Type *Dst,
                                       Type *Src) const;
+
+    unsigned getShuffleCost(ShuffleKind Kind, Type *Tp, int Index) const;
   };
 }