Uses a conditional move for usage counter increment instead of a branch

runtime/vm/stub_code_mips.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 1522 matching lines @@
   __ LeaveStubFrame();
 
   Label call_target_function;
   __ b(&call_target_function);
 
   __ Bind(&found);
   // T0: Pointer to an IC data check group.
   const intptr_t target_offset = ICData::TargetIndexFor(num_args) * kWordSize;
   const intptr_t count_offset = ICData::CountIndexFor(num_args) * kWordSize;
   __ lw(T3, Address(T0, target_offset));
+
+  // Update counter.
   __ lw(T4, Address(T0, count_offset));
-
-  __ AddImmediateDetectOverflow(T4, T4, Smi::RawValue(1), T5, T6);
-
-  __ bgez(T5, &call_target_function);  // No overflow.
-  __ delay_slot()->sw(T4, Address(T0, count_offset));
-
-  __ LoadImmediate(T1, Smi::RawValue(Smi::kMaxValue));
-  __ sw(T1, Address(T0, count_offset));
+  __ AddImmediateDetectOverflow(T7, T4, Smi::RawValue(1), T5, T6);
+  __ slt(CMPRES1, T5, ZR);  // T5 is < 0 if there was overflow.
+  __ LoadImmediate(T4, Smi::RawValue(Smi::kMaxValue));
+  __ movz(T4, T7, CMPRES1);
+  __ sw(T4, Address(T0, count_offset));
 
   __ Bind(&call_target_function);
   // T0 <- T3: Target function.
   __ mov(T0, T3);
   Label is_compiled;
   __ lw(T4, FieldAddress(T0, Function::instructions_offset()));
   __ AddImmediate(T4, Instructions::HeaderSize() - kHeapObjectTag);
   __ jr(T4);
 }
 
@@ skipping 501 matching lines @@
   const Register right = T0;
   __ lw(left, Address(SP, 1 * kWordSize));
   __ lw(right, Address(SP, 0 * kWordSize));
   GenerateIdenticalWithNumberCheckStub(assembler, left, right, temp1, temp2);
   __ Ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS