Write functions to handle loading and saving words a block at a time, taking into

account endian differences.

The current code does not take advantage of the knowledge of which endianness
we are running on; an optimization suggested by Yves Jerschow is to use (unsafe)
casts to speed up the load/store operations. This turns out to provide large
performance increases (30% or more) in some cases.

Even without the unsafe casts, this version seems to average a few percent
faster, probably because the longer loading loops have been partially or
fully unrolled.

This also makes the code implementing low-level algorithms like ciphers and
hashes a bit more succint.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/crc32.cpp b/src/crc32.cpp
index b10a2eebe..e897cbc02 100644
--- a/src/crc32.cpp
+++ b/src/crc32.cpp
@@ -93,8 +93,7 @@ void CRC32::add_data(const byte input[], u32bit length)
 void CRC32::final_result(byte output[])
    {
    crc ^= 0xFFFFFFFF;
-   for(u32bit j = 0; j != 4; ++j)
-      output[j] = get_byte(j, crc);
+   store_be(crc, output);
    clear();
    }