Allow div and cmp to work in uint32 mode

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 bea7bc4a84cf876abc4afb680e625b70db6c3821..18d58ae1f4d31fe860284eba2f2b846e1379e5e8 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -1367,7 +1367,9 @@ void LCodeGen::DoDivI(LDivI* instr) {
     }
 
     if (test_value != 0) {
-      if (instr->hydrogen()->CheckFlag(
+      if (instr->hydrogen()->CheckFlag(HInstruction::kUint32)) {
+        __ sar(dividend, power);
+      } else if (instr->hydrogen()->CheckFlag(
           HInstruction::kAllUsesTruncatingToInt32)) {
         Label done, negative;
         __ cmp(dividend, 0);
@@ -1429,9 +1431,15 @@ void LCodeGen::DoDivI(LDivI* instr) {
     __ bind(&left_not_min_int);
   }
 
-  // Sign extend to edx.
-  __ cdq();
-  __ idiv(right_reg);
+  if (instr->hydrogen()->CheckFlag(HInstruction::kUint32)) {
+    // Zero out edx (don't use cdq, this is unsigned).
+    __ xor_(edx, edx);
+    __ div(right_reg);
+  } else {
+    // Sign extend to edx.
+    __ cdq();
+    __ idiv(right_reg);
+  }
 
   if (instr->is_flooring()) {
     Label done;
@@ -2314,7 +2322,9 @@ void LCodeGen::DoCmpIDAndBranch(LCmpIDAndBranch* instr) {
   LOperand* right = instr->right();
   int false_block = chunk_->LookupDestination(instr->false_block_id());
   int true_block = chunk_->LookupDestination(instr->true_block_id());
-  Condition cc = TokenToCondition(instr->op(), instr->is_double());
+  bool is_unsigned =
+      instr->is_double() || instr->hydrogen()->CheckFlag(HInstruction::kUint32);
+  Condition cc = TokenToCondition(instr->op(), is_unsigned);
 
   if (left->IsConstantOperand() && right->IsConstantOperand()) {
     // We can statically evaluate the comparison.