ART: Skip compiler-driver compile loop for VerifyAtRuntime
We don't compile (not even dex-to-dex) anyways, so skip iterating
over all methods. Shows a ~10% improvement of boot image compile
time on Nexus 9. Shows a ~40% improvement for a common large app
on the same device. Most of the remaining time is unzipping dex
files.
Bug: 24103765
Change-Id: I00931fd062a0a2297d1c7b90794302cb664571cc
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index 4c1408a..750e912 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -490,8 +490,18 @@
std::unique_ptr<ThreadPool> thread_pool(
new ThreadPool("Compiler driver thread pool", thread_count_ - 1));
VLOG(compiler) << "Before precompile " << GetMemoryUsageString(false);
+ // Precompile:
+ // 1) Load image classes
+ // 2) Resolve all classes
+ // 3) Attempt to verify all classes
+ // 4) Attempt to initialize image classes, and trivially initialized classes
PreCompile(class_loader, dex_files, thread_pool.get(), timings);
- Compile(class_loader, dex_files, thread_pool.get(), timings);
+ // Compile:
+ // 1) Compile all classes and methods enabled for compilation. May fall back to dex-to-dex
+ // compilation.
+ if (!GetCompilerOptions().VerifyAtRuntime()) {
+ Compile(class_loader, dex_files, thread_pool.get(), timings);
+ }
if (dump_stats_) {
stats_->Dump();
}