Added flag --inline_smi_string_hashcode and --inline_smi_string_hashcode_ratio to decide when/if sh…

runtime/vm/flow_graph_compiler_mips.cc

Index: runtime/vm/flow_graph_compiler_mips.cc
diff --git a/runtime/vm/flow_graph_compiler_mips.cc b/runtime/vm/flow_graph_compiler_mips.cc
index 9fa5d9f31afd4d1d932ee5ba1c059f930732ef44..266c5660409db7e1247b0741a67364221d911187 100644
--- a/runtime/vm/flow_graph_compiler_mips.cc
+++ b/runtime/vm/flow_graph_compiler_mips.cc
@@ -1330,15 +1330,13 @@ void FlowGraphCompiler::EmitMegamorphicInstanceCall(
   // Load receiver into T0,
   __ lw(T0, Address(SP, (argument_count - 1) * kWordSize));
   Label done;
-  if (name.raw() == Symbols::hashCode().raw()) {
-    Label try_onebytestring, megamorphic_call;
+  if (ShouldInlineSmiStringHashCode(ic_data)) {
+    Label megamorphic_call;
     __ Comment("Inlined get:hashCode for Smi and OneByteString");
+    __ mov(V0, T0);  // Move Smi hashcode to V0.
     __ andi(CMPRES1, T0, Immediate(kSmiTagMask));
-    __ bne(CMPRES1, ZR, &try_onebytestring);  // Not Smi.
-    __ mov(V0, T0);
-    __ b(&done);
+    __ beq(CMPRES1, ZR, &done);  // Is Smi.

[zra, 2016/04/27 16:28:17]

The mov can go in the branch delay slot:

__ beq(CMPRES1, ZR, &done);
__ delay_slot()->mov(V0, T0);

[srdjan, 2016/04/27 18:10:22]

Done.

 
-    __ Bind(&try_onebytestring);
     __ LoadClassId(CMPRES1, T0);  // Class ID check.
     __ BranchNotEqual(
         CMPRES1, Immediate(kOneByteStringCid), &megamorphic_call);