src/cpu/s390/vm/macroAssembler_s390.hpp

@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2016 SAP SE. All rights reserved.
+ * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2017, SAP SE. 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
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.

@@ -1002,26 +1002,39 @@
   // the numbers of 8-byte words.
   void zap_from_to(Register low, Register high, Register tmp1 = Z_R0, Register tmp2 = Z_R1,
                    int before = 0, int after = 0) PRODUCT_RETURN;
 
   // Emitters for CRC32 calculation.
+  // A note on invertCRC:
+  //   Unfortunately, internal representation of crc differs between CRC32 and CRC32C.
+  //   CRC32 holds it's current crc value in the externally visible representation.
+  //   CRC32C holds it's current crc value in internal format, ready for updating.
+  //   Thus, the crc value mut be bit-flipped before updating it in the CRC32 case.
+  //   In the CRC32C case, it must be bit-flipped when it is given to the outside world (getValue()).
+  //   The bool invertCRC parameter indicates whether bit-flipping is required before updates.
  private:
   void fold_byte_crc32(Register crc, Register table, Register val, Register tmp);
   void fold_8bit_crc32(Register crc, Register table, Register tmp);
+  void update_byte_crc32( Register crc, Register val, Register table);
   void update_byteLoop_crc32(Register crc, Register buf, Register len, Register table,
-                             Register data, bool invertCRC);
+                             Register data);
   void update_1word_crc32(Register crc, Register buf, Register table, int bufDisp, int bufInc,
                           Register t0,  Register t1,  Register t2,  Register t3);
  public:
-  void update_byte_crc32( Register crc, Register val, Register table);
-  void kernel_crc32_singleByte(Register crc, Register buf, Register len, Register table, Register tmp);
+  void kernel_crc32_singleByteReg(Register crc, Register val, Register table,
+                                  bool invertCRC);
+  void kernel_crc32_singleByte(Register crc, Register buf, Register len, Register table, Register tmp,
+                               bool invertCRC);
   void kernel_crc32_1byte(Register crc, Register buf, Register len, Register table,
-                          Register t0,  Register t1,  Register t2,  Register t3);
+                          Register t0,  Register t1,  Register t2,  Register t3,
+                          bool invertCRC);
   void kernel_crc32_1word(Register crc, Register buf, Register len, Register table,
-                          Register t0,  Register t1,  Register t2,  Register t3);
+                          Register t0,  Register t1,  Register t2,  Register t3,
+                          bool invertCRC);
   void kernel_crc32_2word(Register crc, Register buf, Register len, Register table,
-                          Register t0,  Register t1,  Register t2,  Register t3);
+                          Register t0,  Register t1,  Register t2,  Register t3,
+                          bool invertCRC);
 
   // Emitters for BigInteger.multiplyToLen intrinsic
   // note: length of result array (zlen) is passed on the stack
  private:
   void add2_with_carry(Register dest_hi, Register dest_lo,