Simplify boxing followed by unboxing.

Also mark boxing `valueOf()` intrinsics as never null
to avoid creating unnecessary `HNullCheck` instructions.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Change-Id: I86e7721e3af6c59407aa2ddfc1bd11bd2fdac83c

1 files changed, 16 insertions, 0 deletions

diff --git a/compiler/optimizing/nodes.cc b/compiler/optimizing/nodes.cc
index 53ed49a307..2cfe5b3ae2 100644
--- a/compiler/optimizing/nodes.cc
+++ b/compiler/optimizing/nodes.cc
@@ -35,6 +35,7 @@
 #include "class_root-inl.h"
 #include "code_generator.h"
 #include "common_dominator.h"
+#include "intrinsic_objects.h"
 #include "intrinsics.h"
 #include "intrinsics_list.h"
 #include "mirror/class-inl.h"
@@ -3363,6 +3364,21 @@ std::ostream& operator<<(std::ostream& os, HInvokeStaticOrDirect::ClinitCheckReq
   }
 }
 
+bool HInvokeStaticOrDirect::CanBeNull() const {
+  if (GetType() != DataType::Type::kReference || IsStringInit()) {
+    return false;
+  }
+  switch (GetIntrinsic()) {
+#define DEFINE_BOXED_CASE(name, unused1, unused2, unused3, unused4) \
+    case Intrinsics::k##name##ValueOf: \
+      return false;
+    BOXED_TYPES(DEFINE_BOXED_CASE)
+#undef DEFINE_BOXED_CASE
+    default:
+      return true;
+  }
+}
+
 bool HInvokeVirtual::CanDoImplicitNullCheckOn(HInstruction* obj) const {
   if (obj != InputAt(0)) {
     return false;