X87: vector-based ICs did not update type feedback counts correctly.

src/x87/code-stubs-x87.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X87
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1939 matching lines @@
 
   if (!FLAG_trace_ic) {
     // We are going megamorphic. If the feedback is a JSFunction, it is fine
     // to handle it here. More complex cases are dealt with in the runtime.
     __ AssertNotSmi(ecx);
     __ CmpObjectType(ecx, JS_FUNCTION_TYPE, ecx);
     __ j(not_equal, &miss);
     __ mov(FieldOperand(ebx, edx, times_half_pointer_size,
                         FixedArray::kHeaderSize),
            Immediate(TypeFeedbackVector::MegamorphicSentinel(isolate)));
+    // We have to update statistics for runtime profiling.
+    const int with_types_offset =
+        FixedArray::OffsetOfElementAt(TypeFeedbackVector::kWithTypesIndex);
+    __ sub(FieldOperand(ebx, with_types_offset), Immediate(Smi::FromInt(1)));
+    const int generic_offset =
+        FixedArray::OffsetOfElementAt(TypeFeedbackVector::kGenericCountIndex);
+    __ add(FieldOperand(ebx, generic_offset), Immediate(Smi::FromInt(1)));
     __ jmp(&slow_start);
   }
 
   // We are here because tracing is on or we are going monomorphic.
   __ bind(&miss);
   GenerateMiss(masm);
 
   // the slow case
   __ bind(&slow_start);
 
@@ skipping 2423 matching lines @@
                               Operand(ebp, 7 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X87