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

runtime/vm/flow_graph_compiler_x64.cc

Index: runtime/vm/flow_graph_compiler_x64.cc
===================================================================
--- runtime/vm/flow_graph_compiler_x64.cc	(revision 12897)
+++ runtime/vm/flow_graph_compiler_x64.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.");
+// TODO(fschneider): Support unboxed mint arithmetic on x64.
+DEFINE_FLAG(bool, unbox_integers, false, "Optimize 64-bit integer arithmetic.");

[srdjan, 2012/09/28 16:50:26]

Do you need this flag? It will not work on X64 if we enable it, will it? Do you
plan to implement it at all? Maybe just return false in SupportsUnboxedMints.
Maybe we could later have a flag unbox_integers which would unbox mints and
Smi-s.

[Florian Schneider, 2012/10/02 11:10:31]

Done.

 
 
+bool FlowGraphCompiler::SupportsUnboxedMints() {
+  return FLAG_unbox_integers
+      && 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);