Changeset 3836

Timestamp:

08/03/08 13:17:34 (4 months ago)

Author:

kris

Message:

fixes #1157 :: tango.io.digest.Crc32 speed-up (with version, for now)

thanks to gim

Files:

• trunk/tango/io/digest/Crc32.d (modified) (3 diffs)

trunk/tango/io/digest/Crc32.d

@@ -47 +47 @@
-                        for (int j = 8; j > 0; j--)
-                        {
+                                version (Gim)
+                                {
+                                if (value & 1) 
+                                   {
+                                   value >>>= 1;
+                                   value ^= polynomial;
+                                   }
+                                else
+                                   value >>>= 1;
+                                }
+                                else
+                                {
-                                if (value & 1) {
-                                        value &= 0xFFFFFFFE;
@@ -58 +70 @@
-                                        value /= 2;
-                                        value &= 0x7FFFFFFF;
+                                }
-                                }
-                        }
@@ -72 +85 @@
-                        auto i = cast(ubyte) r;// & 0xff;
-                        i ^= value;
+                        version (Gim)
+                        {
+                        r >>>= 8;
+                        }
+                        else
+                        {
-                        r &= 0xFFFFFF00;
-                        r /= 0x100;
-                        r &= 16777215;
+                        }
-                        r ^= table[i];
-                }