From 9442603fcd6193694b9615dc6533af0e4ec61747 Mon Sep 17 00:00:00 2001
From: James Cheng <james.cheng@oracle.com>
Date: Mon, 26 May 2014 18:34:26 -0700
Subject: [PATCH] 8035974: Refactor DigestBase.engineUpdate() method for better
 code generation by JIT compiler

Move the lopp from DigestBase.engineUpdate() to new private method implCompressMultiBlock() which can be intrinsified.

Reviewed-by: psandoz, ascarpino, forax
---
 .../sun/security/provider/DigestBase.java      | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/jdk/src/share/classes/sun/security/provider/DigestBase.java b/jdk/src/share/classes/sun/security/provider/DigestBase.java
index 58812f30ec3..98af71afdf0 100644
--- a/jdk/src/share/classes/sun/security/provider/DigestBase.java
+++ b/jdk/src/share/classes/sun/security/provider/DigestBase.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -122,10 +122,10 @@ abstract class DigestBase extends MessageDigestSpi implements Cloneable {
             }
         }
         // compress complete blocks
-        while (len >= blockSize) {
-            implCompress(b, ofs);
-            len -= blockSize;
-            ofs += blockSize;
+        if (len >= blockSize) {
+            int limit = ofs + len;
+            ofs = implCompressMultiBlock(b, ofs, limit - blockSize);
+            len = limit - ofs;
         }
         // copy remainder to buffer
         if (len > 0) {
@@ -134,6 +134,14 @@ abstract class DigestBase extends MessageDigestSpi implements Cloneable {
         }
     }
 
+    // compress complete blocks
+    private int implCompressMultiBlock(byte[] b, int ofs, int limit) {
+        for (; ofs <= limit; ofs += blockSize) {
+            implCompress(b, ofs);
+        }
+        return ofs;
+    }
+
     // reset this object. See JCA doc.
     protected final void engineReset() {
         if (bytesProcessed == 0) {