Inline smi code in count operations in the full code generator.

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
===================================================================
--- src/ia32/full-codegen-ia32.cc	(revision 3667)
+++ src/ia32/full-codegen-ia32.cc	(working copy)
@@ -1482,7 +1482,7 @@
   if (assign_type == VARIABLE) {
     ASSERT(expr->expression()->AsVariableProxy()->var() != NULL);
     Location saved_location = location_;
-    location_ = kStack;
+    location_ = kAccumulator;
     EmitVariableLoad(expr->expression()->AsVariableProxy()->var(),
                      Expression::kValue);
     location_ = saved_location;
@@ -1498,11 +1498,15 @@
       VisitForValue(prop->key(), kStack);
       EmitKeyedPropertyLoad(prop);
     }
-    __ push(eax);
   }
 
-  // Convert to number.
+  // Call ToNumber only if operand is not a smi.
+  Label no_conversion;
+  __ test(eax, Immediate(kSmiTagMask));
+  __ j(zero, &no_conversion);
+  __ push(eax);
   __ InvokeBuiltin(Builtins::TO_NUMBER, CALL_FUNCTION);
+  __ bind(&no_conversion);
 
   // Save result for postfix expressions.
   if (expr->is_postfix()) {
@@ -1534,6 +1538,27 @@
     }
   }
 
+  // Inline smi case if we are in a loop.
+  Label stub_call, done;
+  if (loop_depth() > 0) {
+    if (expr->op() == Token::INC) {
+      __ add(Operand(eax), Immediate(Smi::FromInt(1)));
+    } else {
+      __ sub(Operand(eax), Immediate(Smi::FromInt(1)));
+    }
+    __ j(overflow, &stub_call);
+    // We could eliminate this smi check if we split the code at
+    // the first smi check before calling ToNumber.
+    __ test(eax, Immediate(kSmiTagMask));
+    __ j(zero, &done);
+    __ bind(&stub_call);
+    // Call stub. Undo operation first.
+    if (expr->op() == Token::INC) {
+      __ sub(Operand(eax), Immediate(Smi::FromInt(1)));
+    } else {
+      __ add(Operand(eax), Immediate(Smi::FromInt(1)));
+    }
+  }
   // Call stub for +1/-1.
   __ push(eax);
   __ push(Immediate(Smi::FromInt(1)));
@@ -1541,6 +1566,7 @@
                            NO_OVERWRITE,
                            NO_GENERIC_BINARY_FLAGS);
   __ CallStub(&stub);
+  __ bind(&done);
 
   // Store the value returned in eax.
   switch (assign_type) {