Integrate SIMD optimisations for zlib

third_party/zlib/crc32.c

 /* crc32.c -- compute the CRC-32 of a data stream
  * Copyright (C) 1995-2006, 2010 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  *
  * Thanks to Rodney Brown <rbrown64@csc.com.au> for his contribution of faster
  * CRC methods: exclusive-oring 32 bits of data at a time, and pre-computing
  * tables for updating the shift register in one step with three exclusive-ors
  * instead of four steps with four exclusive-ors.  This results in about a
  * factor of two increase in speed on a Power PC G4 (PPC7455) using gcc -O3.
  */
 
 /* @(#) $Id$ */
 
 /*
   Note on the use of DYNAMIC_CRC_TABLE: there is no mutex or semaphore
   protection on the static variables used to control the first-use generation
   of the crc tables.  Therefore, if you #define DYNAMIC_CRC_TABLE, you should
   first call get_crc_table() to initialize the tables before allowing more than
   one thread to use crc32().
  */
 
 #ifdef MAKECRCH
 #  include <stdio.h>
 #  ifndef DYNAMIC_CRC_TABLE
 #    define DYNAMIC_CRC_TABLE
 #  endif /* !DYNAMIC_CRC_TABLE */
 #endif /* MAKECRCH */
 
+#include "deflate.h"
+#include "x86.h"
 #include "zutil.h"      /* for STDC and FAR definitions */
 
 #define local static
 
 /* Find a four-byte integer type for crc32_little() and crc32_big(). */
 #ifndef NOBYFOUR
 #  ifdef STDC           /* need ANSI C limits.h to determine sizes */
 #    include <limits.h>
 #    define BYFOUR
 #    if (UINT_MAX == 0xffffffffUL)
@@ skipping 394 matching lines @@
     return crc32_combine_(crc1, crc2, len2);
 }
 
 uLong ZEXPORT crc32_combine64(crc1, crc2, len2)
     uLong crc1;
     uLong crc2;
     z_off64_t len2;
 {
     return crc32_combine_(crc1, crc2, len2);
 }
+
+ZLIB_INTERNAL void crc_reset(deflate_state *const s)
+{
+    if (x86_cpu_enable_simd) {
+        crc_fold_init(s);
+        return;
+    }
+    s->strm->adler = crc32(0L, Z_NULL, 0);
+}
+
+ZLIB_INTERNAL void crc_finalize(deflate_state *const s)
+{
+    if (x86_cpu_enable_simd)
+        s->strm->adler = crc_fold_512to32(s);
+}
+
+ZLIB_INTERNAL void copy_with_crc(z_streamp strm, Bytef *dst, long size)
+{
+    if (x86_cpu_enable_simd) {
+        crc_fold_copy(strm->state, dst, strm->next_in, size);
+        return;
+    }
+    zmemcpy(dst, strm->next_in, size);
+    strm->adler = crc32(strm->adler, dst, size);
+}