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, 8 insertions, 0 deletions

diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index c4dd31dca1..10b59d2277 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -812,6 +812,14 @@ CodeGenerator* OptimizingCompiler::TryCompile(ArenaAllocator* allocator,
     graph->SetArtMethod(method);
   }
 
+  jit::Jit* jit = Runtime::Current()->GetJit();
+  if (jit != nullptr) {
+    ProfilingInfo* info = jit->GetCodeCache()->GetProfilingInfo(method, Thread::Current());
+    DCHECK(compilation_kind != CompilationKind::kBaseline || info != nullptr)
+        << "Compiling a method baseline should always have a ProfilingInfo";
+    graph->SetProfilingInfo(info);
+  }
+
   std::unique_ptr<CodeGenerator> codegen(
       CodeGenerator::Create(graph,
                             compiler_options,