From a39d6c3f86104ca474086c599a88806b419ee875 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E2=80=9CsaiHemak=E2=80=9D?= <“sakandur@in.ibm.com”>
Date: Wed, 22 Feb 2017 16:56:33 +0530
Subject: [PATCH] Performance regression in NSMutableData[SR-3966]

---
 CoreFoundation/Collections.subproj/CFData.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/CoreFoundation/Collections.subproj/CFData.c b/CoreFoundation/Collections.subproj/CFData.c
index 3d966f2c83..22555af1bf 100644
--- a/CoreFoundation/Collections.subproj/CFData.c
+++ b/CoreFoundation/Collections.subproj/CFData.c
@@ -312,10 +312,13 @@ CFTypeID CFDataGetTypeID(void) {
 void _CFDataInit(CFMutableDataRef memory, CFOptionFlags flags, CFIndex capacity, const uint8_t *bytes, CFIndex length, Boolean noCopy) {
     Boolean isMutable = ((flags & __kCFMutable) != 0);
     Boolean isGrowable = ((flags & __kCFGrowable) != 0);
+    Boolean isDontDeallocate = ((flags & __kCFDontDeallocate) != 0);
     
     __CFDataSetNumBytesUsed(memory, 0);
     __CFDataSetLength(memory, 0);
-    __CFDataSetInfoBits(memory, __kCFDontDeallocate);
+    if (isDontDeallocate) {
+        __CFDataSetInfoBits(memory, __kCFDontDeallocate);
+    }
     
     if (isMutable && isGrowable) {
         __CFDataSetCapacity(memory, __CFDataRoundUpCapacity(1));