MIPS: Fix uint32-to-smi conversion in Lithium.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index f54d4a5b0cd9b8faf260937b28726da3d81bfd33..ecbfc73646d675d7f43665234cb38dcd1ad38929 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -4584,9 +4584,7 @@ void LCodeGen::DoInteger32ToDouble(LInteger32ToDouble* instr) {
 
 void LCodeGen::DoInteger32ToSmi(LInteger32ToSmi* instr) {
   LOperand* input = instr->value();
-  ASSERT(input->IsRegister());
   LOperand* output = instr->result();
-  ASSERT(output->IsRegister());
   Register scratch = scratch0();
 
   __ SmiTagCheckOverflow(ToRegister(output), ToRegister(input), scratch);
@@ -4607,6 +4605,19 @@ void LCodeGen::DoUint32ToDouble(LUint32ToDouble* instr) {
 }
 
 
+void LCodeGen::DoUint32ToSmi(LUint32ToSmi* instr) {
+  LOperand* input = instr->value();
+  LOperand* output = instr->result();
+  if (!instr->hydrogen()->value()->HasRange() ||
+      !instr->hydrogen()->value()->range()->IsInSmiRange()) {
+    Register scratch = scratch0();
+    __ And(scratch, ToRegister(input), Operand(0xc0000000));
+    DeoptimizeIf(ne, instr->environment(), scratch, Operand(zero_reg));
+  }
+  __ SmiTag(ToRegister(output), ToRegister(input));
+}
+
+
 void LCodeGen::DoNumberTagI(LNumberTagI* instr) {
   class DeferredNumberTagI V8_FINAL : public LDeferredCode {
    public: