1 files changed, 52 insertions, 1 deletions
diff --git a/compiler/optimizing/intrinsics_arm.cc b/compiler/optimizing/intrinsics_arm.cc
index 8f64faeac0..c262cf983d 100644
--- a/compiler/optimizing/intrinsics_arm.cc
+++ b/compiler/optimizing/intrinsics_arm.cc
@@ -2592,6 +2592,58 @@ void IntrinsicCodeGeneratorARM::VisitDoubleIsInfinite(HInvoke* invoke) {
   __ Lsr(out, out, 5);
 }
 
+void IntrinsicLocationsBuilderARM::VisitReferenceGetReferent(HInvoke* invoke) {
+  if (kEmitCompilerReadBarrier) {
+    // Do not intrinsify this call with the read barrier configuration.
+    return;
+  }
+  LocationSummary* locations = new (arena_) LocationSummary(invoke,
+                                                            LocationSummary::kCallOnSlowPath,
+                                                            kIntrinsified);
+  locations->SetInAt(0, Location::RequiresRegister());
+  locations->SetOut(Location::SameAsFirstInput());
+  locations->AddTemp(Location::RequiresRegister());
+}
+
+void IntrinsicCodeGeneratorARM::VisitReferenceGetReferent(HInvoke* invoke) {
+  DCHECK(!kEmitCompilerReadBarrier);
+  ArmAssembler* const assembler = GetAssembler();
+  LocationSummary* locations = invoke->GetLocations();
+
+  Register obj = locations->InAt(0).AsRegister<Register>();
+  Register out = locations->Out().AsRegister<Register>();
+
+  SlowPathCode* slow_path = new (GetAllocator()) IntrinsicSlowPathARM(invoke);
+  codegen_->AddSlowPath(slow_path);
+
+  // Load ArtMethod first.
+  HInvokeStaticOrDirect* invoke_direct = invoke->AsInvokeStaticOrDirect();
+  DCHECK(invoke_direct != nullptr);
+  Register temp = codegen_->GenerateCalleeMethodStaticOrDirectCall(
+      invoke_direct, locations->GetTemp(0)).AsRegister<Register>();
+
+  // Now get declaring class.
+  __ ldr(temp, Address(temp, ArtMethod::DeclaringClassOffset().Int32Value()));
+
+  uint32_t slow_path_flag_offset = codegen_->GetReferenceSlowFlagOffset();
+  uint32_t disable_flag_offset = codegen_->GetReferenceDisableFlagOffset();
+  DCHECK_NE(slow_path_flag_offset, 0u);
+  DCHECK_NE(disable_flag_offset, 0u);
+  DCHECK_NE(slow_path_flag_offset, disable_flag_offset);
+
+  // Check static flags that prevent using intrinsic.
+  __ ldr(IP, Address(temp, disable_flag_offset));
+  __ ldr(temp, Address(temp, slow_path_flag_offset));
+  __ orr(IP, IP, ShifterOperand(temp));
+  __ CompareAndBranchIfNonZero(IP, slow_path->GetEntryLabel());
+
+  // Fast path.
+  __ ldr(out, Address(obj, mirror::Reference::ReferentOffset().Int32Value()));
+  codegen_->MaybeRecordImplicitNullCheck(invoke);
+  __ MaybeUnpoisonHeapReference(out);
+  __ Bind(slow_path->GetExitLabel());
+}
+
 UNIMPLEMENTED_INTRINSIC(ARM, MathMinDoubleDouble)
 UNIMPLEMENTED_INTRINSIC(ARM, MathMinFloatFloat)
 UNIMPLEMENTED_INTRINSIC(ARM, MathMaxDoubleDouble)
@@ -2605,7 +2657,6 @@ UNIMPLEMENTED_INTRINSIC(ARM, MathRoundDouble)   // Could be done by changing rou
 UNIMPLEMENTED_INTRINSIC(ARM, MathRoundFloat)    // Could be done by changing rounding mode, maybe?
 UNIMPLEMENTED_INTRINSIC(ARM, UnsafeCASLong)     // High register pressure.
 UNIMPLEMENTED_INTRINSIC(ARM, SystemArrayCopyChar)
-UNIMPLEMENTED_INTRINSIC(ARM, ReferenceGetReferent)
 UNIMPLEMENTED_INTRINSIC(ARM, IntegerHighestOneBit)
 UNIMPLEMENTED_INTRINSIC(ARM, LongHighestOneBit)
 UNIMPLEMENTED_INTRINSIC(ARM, IntegerLowestOneBit)