Simplify hotness count in baseline compiled code.

- Always require the current ArtMethod, which also removes the need to
  handle empty frames.
- Remove the use of some temporary registers.
- Require a profiling info when compiling baseline.
- Add a slow path for requiring an optimized compilation.
- Make the counter decrement instead of increment.

A next CL will make the hotness configurable through --jittreshold.

Test: test.py
Bug: 146423102
Change-Id: I1485f66401d6ed218456fe2849eb05fa77479668

1 files changed, 7 insertions, 0 deletions

diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index 16e26dc7bc..c50e04791d 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -75,6 +75,7 @@ class HTryBoundary;
 class FieldInfo;
 class LiveInterval;
 class LocationSummary;
+class ProfilingInfo;
 class SlowPathCode;
 class SsaBuilder;
 
@@ -704,6 +705,9 @@ class HGraph : public ArenaObject<kArenaAllocGraph> {
   ArtMethod* GetArtMethod() const { return art_method_; }
   void SetArtMethod(ArtMethod* method) { art_method_ = method; }
 
+  void SetProfilingInfo(ProfilingInfo* info) { profiling_info_ = info; }
+  ProfilingInfo* GetProfilingInfo() const { return profiling_info_; }
+
   // Returns an instruction with the opposite Boolean value from 'cond'.
   // The instruction has been inserted into the graph, either as a constant, or
   // before cursor.
@@ -870,6 +874,9 @@ class HGraph : public ArenaObject<kArenaAllocGraph> {
   // (such as when the superclass could not be found).
   ArtMethod* art_method_;
 
+  // The `ProfilingInfo` associated with the method being compiled.
+  ProfilingInfo* profiling_info_;
+
   // How we are compiling the graph: either optimized, osr, or baseline.
   // For osr, we will make all loops seen as irreducible and emit special
   // stack maps to mark compiled code entries which the interpreter can