Support for unboxed 64-bit integer bitwise operations and equality on ia32.

runtime/vm/flow_graph_compiler_ia32.cc

Index: runtime/vm/flow_graph_compiler_ia32.cc
===================================================================
--- runtime/vm/flow_graph_compiler_ia32.cc	(revision 13110)
+++ runtime/vm/flow_graph_compiler_ia32.cc	(working copy)
@@ -22,8 +22,19 @@
 DECLARE_FLAG(bool, print_scopes);
 DECLARE_FLAG(bool, reject_named_argument_as_positional);
 DECLARE_FLAG(bool, trace_functions);
+DECLARE_FLAG(bool, use_sse41);
+DEFINE_FLAG(bool, trap_on_deoptimization, false, "Trap on deoptimization.");
+DEFINE_FLAG(bool, unbox_mints, true, "Optimize 64-bit integer arithmetic.");
 
 
+bool FlowGraphCompiler::SupportsUnboxedMints() {
+  // Support unboxed mints when SSE 4.1 is available.
+  return FLAG_unbox_mints
+      && CPUFeatures::sse4_1_supported()
+      && FLAG_use_sse41;
+}
+
+
 void CompilerDeoptInfoWithStub::GenerateCode(FlowGraphCompiler* compiler,
                                              intptr_t stub_ix) {
   // Calls do not need stubs, they share a deoptimization trampoline.
@@ -32,6 +43,7 @@
 #define __ assem->
   __ Comment("Deopt stub for id %"Pd"", deopt_id());
   __ Bind(entry_label());
+  if (FLAG_trap_on_deoptimization) __ int3();
 
   ASSERT(deoptimization_env() != NULL);