Cost Model: Move the 'max unroll factor' variable to the TTI and add initial Cost Model support on ARM.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171928 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 38 insertions, 2 deletions

diff --git a/lib/Target/ARM/ARMTargetTransformInfo.cpp b/lib/Target/ARM/ARMTargetTransformInfo.cpp
index 03a23be0a6..634004acb4 100644
--- a/lib/Target/ARM/ARMTargetTransformInfo.cpp
+++ b/lib/Target/ARM/ARMTargetTransformInfo.cpp
@@ -77,6 +77,31 @@ public:
   virtual unsigned getIntImmCost(const APInt &Imm, Type *Ty) const;
 
   /// @}
+
+
+  /// \name Vector TTI Implementations
+  /// @{
+
+  unsigned getNumberOfRegisters(bool Vector) const {
+    if (Vector) {
+      if (ST->hasNEON())
+        return 16;
+      return 0;
+    }
+
+    if (ST->isThumb1Only())
+      return 8;
+    return 16;
+  }
+
+  unsigned getMaximumUnrollFactor() const {
+    // These are out of order CPUs:
+    if (ST->isCortexA15() || ST->isSwift())
+      return 2;
+    return 1;
+  }
+
+  /// @}
 };
 
 } // end anonymous namespace
diff --git a/lib/Target/X86/X86TargetTransformInfo.cpp b/lib/Target/X86/X86TargetTransformInfo.cpp
index 9cc1b180e9..6ab08cbd12 100644
--- a/lib/Target/X86/X86TargetTransformInfo.cpp
+++ b/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -75,7 +75,6 @@ public:
 
   /// \name Scalar TTI Implementations
   /// @{
-
   virtual PopcntSupportKind getPopcntSupport(unsigned TyWidth) const;
 
   /// @}
@@ -84,6 +83,7 @@ public:
   /// @{
 
   virtual unsigned getNumberOfRegisters(bool Vector) const;
+  virtual unsigned getMaximumUnrollFactor() const;
   virtual unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty) const;
   virtual unsigned getShuffleCost(ShuffleKind Kind, Type *Tp,
                                   int Index, Type *SubTp) const;
@@ -156,7 +156,6 @@ FindInConvertTable(const X86TypeConversionCostTblEntry *Tbl, unsigned len,
   return -1;
 }
 
-
 X86TTI::PopcntSupportKind X86TTI::getPopcntSupport(unsigned TyWidth) const {
   assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2");
   // TODO: Currently the __builtin_popcount() implementation using SSE3
@@ -171,6 +170,18 @@ unsigned X86TTI::getNumberOfRegisters(bool Vector) const {
   return 8;
 }
 
+unsigned X86TTI::getMaximumUnrollFactor() const {
+  if (ST->isAtom())
+    return 1;
+
+  // Sandybridge and Haswell have multiple execution ports and pipelined
+  // vector units.
+  if (ST->hasAVX())
+    return 4;
+
+  return 2;
+}
+
 unsigned X86TTI::getArithmeticInstrCost(unsigned Opcode, Type *Ty) const {
   // Legalize the type.
   std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Ty);