Cost Model: Move the 'max unroll factor' variable to the TTI and add initial Cost Model support on ARM.
llvm-svn: 171928
diff --git a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
index 9cc1b18..6ab08cb 100644
--- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
+++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -75,7 +75,6 @@
/// \name Scalar TTI Implementations
/// @{
-
virtual PopcntSupportKind getPopcntSupport(unsigned TyWidth) const;
/// @}
@@ -84,6 +83,7 @@
/// @{
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 @@
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 @@
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);