BlockFrequency: Bump up the entry frequency a bit.

This is a band-aid to fix the most severe regressions we're seeing from basing
spill decisions on block frequencies, until we have a better solution.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184835 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 6 insertions, 6 deletions

diff --git a/include/llvm/Analysis/BlockFrequencyImpl.h b/include/llvm/Analysis/BlockFrequencyImpl.h
index b3e2d18..d555e0e 100644
--- a/include/llvm/Analysis/BlockFrequencyImpl.h
+++ b/include/llvm/Analysis/BlockFrequencyImpl.h
@@ -33,7 +33,7 @@ class BlockFrequencyInfo;
 class MachineBlockFrequencyInfo;
 
 /// BlockFrequencyImpl implements block frequency algorithm for IR and
-/// Machine Instructions. Algorithm starts with value 1024 (START_FREQ)
+/// Machine Instructions. Algorithm starts with value ENTRY_FREQ
 /// for the entry block and then propagates frequencies using branch weights
 /// from (Machine)BranchProbabilityInfo. LoopInfo is not required because
 /// algorithm can find "backedges" by itself.
diff --git a/include/llvm/Analysis/BlockFrequencyInfo.h b/include/llvm/Analysis/BlockFrequencyInfo.h
index fcab906..267e43b 100644
--- a/include/llvm/Analysis/BlockFrequencyInfo.h
+++ b/include/llvm/Analysis/BlockFrequencyInfo.h
@@ -43,10 +43,10 @@ public:
   void print(raw_ostream &O, const Module *M) const;
 
   /// getblockFreq - Return block frequency. Return 0 if we don't have the
-  /// information. Please note that initial frequency is equal to 1024. It means
-  /// that we should not rely on the value itself, but only on the comparison to
-  /// the other block frequencies. We do this to avoid using of floating points.
-  ///
+  /// information. Please note that initial frequency is equal to ENTRY_FREQ. It
+  /// means that we should not rely on the value itself, but only on the
+  /// comparison to the other block frequencies. We do this to avoid using of
+  /// floating points.
   BlockFrequency getBlockFreq(const BasicBlock *BB) const;
 };
 
diff --git a/include/llvm/Support/BlockFrequency.h b/include/llvm/Support/BlockFrequency.h
index 77b1bf4..85e9437 100644
--- a/include/llvm/Support/BlockFrequency.h
+++ b/include/llvm/Support/BlockFrequency.h
@@ -25,7 +25,7 @@ class BranchProbability;
 class BlockFrequency {
 
   uint64_t Frequency;
-  static const int64_t ENTRY_FREQ = 1024;
+  static const int64_t ENTRY_FREQ = 1 << 14;
 
 public:
   BlockFrequency(uint64_t Freq = 0) : Frequency(Freq) { }