Merged r17441 into 3.20 branch.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index a6c1f5a7ed4975481f7709a96246aaa0ade2b8e4..349c2fab1716cfd78f854ef1ae72b73aecb8a81f 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -4906,6 +4906,17 @@ void LCodeGen::DoUint32ToDouble(LUint32ToDouble* instr) {
 }
 
 
+void LCodeGen::DoUint32ToSmi(LUint32ToSmi* instr) {
+  Register input = ToRegister(instr->value());
+  if (!instr->hydrogen()->value()->HasRange() ||
+      !instr->hydrogen()->value()->range()->IsInSmiRange()) {
+    __ test(input, Immediate(0xc0000000));
+    DeoptimizeIf(not_zero, instr->environment());
+  }
+  __ SmiTag(input);
+}
+
+
 void LCodeGen::DoNumberTagI(LNumberTagI* instr) {
   class DeferredNumberTagI: public LDeferredCode {
    public: