diff --git a/compiler/optimizing/code_generator_arm.cc b/compiler/optimizing/code_generator_arm.cc
index 0403af1..07cc41a 100644
--- a/compiler/optimizing/code_generator_arm.cc
+++ b/compiler/optimizing/code_generator_arm.cc
@@ -2311,9 +2311,12 @@
       break;
     }
     case Primitive::kPrimLong: {
-      locations->SetInAt(0, Location::RequiresRegister());
-      locations->SetInAt(1, Location::RequiresRegister());
-      locations->SetOut(Location::RequiresRegister());
+      InvokeRuntimeCallingConvention calling_convention;
+      locations->SetInAt(0, Location::RegisterPairLocation(
+          calling_convention.GetRegisterAt(0), calling_convention.GetRegisterAt(1)));
+      locations->SetInAt(1, Location::RegisterLocation(calling_convention.GetRegisterAt(2)));
+      // The runtime helper puts the output in R0,R1.
+      locations->SetOut(Location::RegisterPairLocation(R0, R1));
       break;
     }
     default:
@@ -2361,54 +2364,24 @@
       break;
     }
     case Primitive::kPrimLong: {
-      Register o_h = out.AsRegisterPairHigh<Register>();
-      Register o_l = out.AsRegisterPairLow<Register>();
+      // TODO: Inline the assembly instead of calling the runtime.
+      InvokeRuntimeCallingConvention calling_convention;
+      DCHECK_EQ(calling_convention.GetRegisterAt(0), first.AsRegisterPairLow<Register>());
+      DCHECK_EQ(calling_convention.GetRegisterAt(1), first.AsRegisterPairHigh<Register>());
+      DCHECK_EQ(calling_convention.GetRegisterAt(2), second.AsRegister<Register>());
+      DCHECK_EQ(R0, out.AsRegisterPairLow<Register>());
+      DCHECK_EQ(R1, out.AsRegisterPairHigh<Register>());
 
-      Register high = first.AsRegisterPairHigh<Register>();
-      Register low = first.AsRegisterPairLow<Register>();
-
-      Register second_reg = second.AsRegister<Register>();
-
+      int32_t entry_point_offset;
       if (op->IsShl()) {
-        // Shift the high part
-        __ and_(second_reg, second_reg, ShifterOperand(63));
-        __ Lsl(high, high, second_reg);
-        // Shift the low part and `or` what overflowed on the high part
-        __ rsb(IP, second_reg, ShifterOperand(32));
-        __ Lsr(IP, low, IP);
-        __ orr(o_h, high, ShifterOperand(IP));
-        // If the shift is > 32 bits, override the high part
-        __ subs(IP, second_reg, ShifterOperand(32));
-        __ it(PL);
-        __ Lsl(o_h, low, IP, false, PL);
-        // Shift the low part
-        __ Lsl(o_l, low, second_reg);
+        entry_point_offset = QUICK_ENTRY_POINT(pShlLong);
       } else if (op->IsShr()) {
-        // Shift the low part
-        __ and_(second_reg, second_reg, ShifterOperand(63));
-        __ Lsr(low, low, second_reg);
-        // Shift the high part and `or` what underflowed on the low part
-        __ rsb(IP, second_reg, ShifterOperand(32));
-        __ Lsl(IP, high, IP);
-        __ orr(o_l, low, ShifterOperand(IP));
-        // If the shift is > 32 bits, override the low part
-        __ subs(IP, second_reg, ShifterOperand(32));
-        __ it(PL);
-        __ Asr(o_l, high, IP, false, PL);
-        // Shift the high part
-        __ Asr(o_h, high, second_reg);
+        entry_point_offset = QUICK_ENTRY_POINT(pShrLong);
       } else {
-        // same as Shr except we use `Lsr`s and not `Asr`s
-        __ and_(second_reg, second_reg, ShifterOperand(63));
-        __ Lsr(low, low, second_reg);
-        __ rsb(IP, second_reg, ShifterOperand(32));
-        __ Lsl(IP, high, IP);
-        __ orr(o_l, low, ShifterOperand(IP));
-        __ subs(IP, second_reg, ShifterOperand(32));
-        __ it(PL);
-        __ Lsr(o_l, high, IP, false, PL);
-        __ Lsr(o_h, high, second_reg);
+        entry_point_offset = QUICK_ENTRY_POINT(pUshrLong);
       }
+      __ LoadFromOffset(kLoadWord, LR, TR, entry_point_offset);
+      __ blx(LR);
       break;
     }
     default: