Merge ConstantInstr -> UnboxDouble to UnboxedConstant. Reduces register usage and allows for variou…

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
===================================================================
--- runtime/vm/intermediate_language_mips.cc	(revision 35632)
+++ runtime/vm/intermediate_language_mips.cc	(working copy)
@@ -299,6 +299,30 @@
 }
 
 
+LocationSummary* UnboxedConstantInstr::MakeLocationSummary(bool opt) const {
+  const intptr_t kNumInputs = 0;
+  const intptr_t kNumTemps = 1;
+  LocationSummary* locs =
+      new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  locs->set_out(0, Location::RequiresFpuRegister());
+  locs->set_temp(0, Location::RequiresRegister());
+  return locs;
+}
+
+
+void UnboxedConstantInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  // The register allocator drops constant definitions that have no uses.
+  if (!locs()->out(0).IsInvalid()) {
+    ASSERT(value().IsDouble());
+    const Register const_value = locs()->temp(0).reg();
+    const DRegister result = locs()->out(0).fpu_reg();
+    __ LoadObject(const_value, value());
+    __ LoadDFromOffset(result, const_value,
+        Double::value_offset() - kHeapObjectTag);
+  }
+}
+
+
 LocationSummary* AssertAssignableInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 3;
   const intptr_t kNumTemps = 0;