[RegisterBankInfo] Add statistics for dynamic partial mappings.

Collect statistics about the number of partial mappings dynamically
allocated and accessed. Ultimately, when the whole TableGen
infrastructure is set, those numbers should be zero.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282274 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp b/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp
index 88e47f6fb89132de2e80b9e9324f3de2f0eada71..b52e098539860da00bbc4c1f8eeba12eebbf5802 100644 (file)
--- a/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp
+++ b/lib/CodeGen/GlobalISel/RegisterBankInfo.cpp
@@ -13,6 +13,7 @@
 #include "llvm/CodeGen/GlobalISel/RegisterBankInfo.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/CodeGen/GlobalISel/RegisterBank.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
@@ -32,6 +33,11 @@
 
 using namespace llvm;
 
+STATISTIC(NumPartialMappingsCreated,
+          "Number of partial mappings dynamically created");
+STATISTIC(NumPartialMappingsAccessed,
+          "Number of partial mappings dynamically accessed");
+
 const unsigned RegisterBankInfo::DefaultMappingID = UINT_MAX;
 const unsigned RegisterBankInfo::InvalidMappingID = UINT_MAX - 1;
 
@@ -309,10 +315,15 @@ RegisterBankInfo::getInstrMappingImpl(const MachineInstr &MI) const {
 const RegisterBankInfo::PartialMapping &
 RegisterBankInfo::getPartialMapping(unsigned StartIdx, unsigned Length,
                                     const RegisterBank &RegBank) const {
+  ++NumPartialMappingsAccessed;
+
   hash_code Hash = hash_combine(StartIdx, Length, RegBank.getID());
   const auto &It = MapOfPartialMappings.find(Hash);
   if (It != MapOfPartialMappings.end())
     return It->second;
+
+  ++NumPartialMappingsCreated;
+
   PartialMapping &PartMapping = MapOfPartialMappings[Hash];
   PartMapping = PartialMapping{StartIdx, Length, RegBank};
   return PartMapping;