MIPS: Update the gap resolver to support Smi constants.

Port r14850 (787f0941)

BUG=

Review URL: https://codereview.chromium.org/16146005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14865 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/lithium-codegen-mips.cc

@@ -521,6 +521,12 @@ int LCodeGen::ToInteger32(LConstantOperand* op) const {
 }
 
 
+Smi* LCodeGen::ToSmi(LConstantOperand* op) const {
+  HConstant* constant = chunk_->LookupConstant(op);
+  return Smi::FromInt(constant->Integer32Value());
+}
+
+
 double LCodeGen::ToDouble(LConstantOperand* op) const {
   HConstant* constant = chunk_->LookupConstant(op);
   ASSERT(constant->HasDoubleValue());

src/mips/lithium-codegen-mips.h

@@ -118,6 +118,7 @@ class LCodeGen BASE_EMBEDDED {
                                         FloatRegister flt_scratch,
                                         DoubleRegister dbl_scratch);
   int ToInteger32(LConstantOperand* op) const;
+  Smi* ToSmi(LConstantOperand* op) const;
   double ToDouble(LConstantOperand* op) const;
   Operand ToOperand(LOperand* op);
   MemOperand ToMemOperand(LOperand* op) const;

src/mips/lithium-gap-resolver-mips.cc

@@ -252,7 +252,9 @@ void LGapResolver::EmitMove(int index) {
     LConstantOperand* constant_source = LConstantOperand::cast(source);
     if (destination->IsRegister()) {
       Register dst = cgen_->ToRegister(destination);
-      if (cgen_->IsInteger32(constant_source)) {
+      if (cgen_->IsSmi(constant_source)) {
+        __ li(dst, Operand(cgen_->ToSmi(constant_source)));
+      } else if (cgen_->IsInteger32(constant_source)) {
         __ li(dst, Operand(cgen_->ToInteger32(constant_source)));
       } else {
         __ LoadObject(dst, cgen_->ToHandle(constant_source));
@@ -260,7 +262,9 @@ void LGapResolver::EmitMove(int index) {
     } else {
       ASSERT(destination->IsStackSlot());
       ASSERT(!in_cycle_);  // Constant moves happen after all cycles are gone.
-      if (cgen_->IsInteger32(constant_source)) {
+      if (cgen_->IsSmi(constant_source)) {
+        __ li(kLithiumScratchReg, Operand(cgen_->ToSmi(constant_source)));
+      } else if (cgen_->IsInteger32(constant_source)) {
         __ li(kLithiumScratchReg,
               Operand(cgen_->ToInteger32(constant_source)));
       } else {