From a88896b5c042399a83e434cc39cd3cc098737381 Mon Sep 17 00:00:00 2001
From: James Molloy <james.molloy@arm.com>
Date: Thu, 21 Aug 2014 00:02:51 +0000
Subject: [PATCH] [LoopVectorize] Up the maximum unroll factor to 4 for AArch64

Only for Cortex-A57 and Cyclone for now, where it has shown wins.

llvm-svn: 216141
---
 llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
index 2058dd06b218..24cb129b0b77 100644
--- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
@@ -104,7 +104,7 @@ public:
     return 64;
   }
 
-  unsigned getMaximumUnrollFactor() const override { return 2; }
+  unsigned getMaximumUnrollFactor() const override;
 
   unsigned getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src) const
       override;
@@ -513,3 +513,9 @@ unsigned AArch64TTI::getCostOfKeepingLiveOverCall(ArrayRef<Type*> Tys) const {
   }
   return Cost;
 }
+
+unsigned AArch64TTI::getMaximumUnrollFactor() const {
+  if (ST->isCortexA57() || ST->isCyclone())
+    return 4;
+  return 2;
+}