More ProfileInfo improvements.

 - Part of optimal static profiling patch sequence by Andreas Neustifter.

 - Store edge, block, and function information separately for each functions
   (instead of in one giant map).

 - Return frequencies as double instead of int, and use a sentinel value for
   missing information.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78477 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 2 deletions

diff --git a/lib/Transforms/Instrumentation/EdgeProfiling.cpp b/lib/Transforms/Instrumentation/EdgeProfiling.cpp
index f291b44..283f863 100644
--- a/lib/Transforms/Instrumentation/EdgeProfiling.cpp
+++ b/lib/Transforms/Instrumentation/EdgeProfiling.cpp
@@ -55,7 +55,10 @@ bool EdgeProfiler::runOnModule(Module &M) {
 
   std::set<BasicBlock*> BlocksToInstrument;
   unsigned NumEdges = 0;
-  for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
+  for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
+    if (F->isDeclaration()) continue;
+    // Reserve space for (0,entry) edge.
+    ++NumEdges;
     for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
       // Keep track of which blocks need to be instrumented.  We don't want to
       // instrument blocks that are added as the result of breaking critical
@@ -63,6 +66,7 @@ bool EdgeProfiler::runOnModule(Module &M) {
       BlocksToInstrument.insert(BB);
       NumEdges += BB->getTerminator()->getNumSuccessors();
     }
+  }
 
   const Type *ATy = ArrayType::get(Type::Int32Ty, NumEdges);
   GlobalVariable *Counters =
@@ -71,7 +75,10 @@ bool EdgeProfiler::runOnModule(Module &M) {
 
   // Instrument all of the edges...
   unsigned i = 0;
-  for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
+  for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
+    if (F->isDeclaration()) continue;
+    // Create counter for (0,entry) edge.
+    IncrementCounterInBlock(&F->getEntryBlock(), i++, Counters);
     for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
       if (BlocksToInstrument.count(BB)) {  // Don't instrument inserted blocks
         // Okay, we have to add a counter of each outgoing edge.  If the
@@ -94,6 +101,7 @@ bool EdgeProfiler::runOnModule(Module &M) {
           }
         }
       }
+  }
 
   // Add the initialization call to main.
   InsertProfilingInitCall(Main, "llvm_start_edge_profiling", Counters);