Update xxhash implementation from https://github.com/Cyan4973/xxHash.
This has moved a lot of code so the diff is huge, plus the code we don't
need now for btrfs has been removed (XXH3, XXH32).
There's no significant change in performance.
Signed-off-by: David Sterba <dsterba@suse.com>
[FALSE ALERT]
Unlike gcc, clang doesn't really understand the comments, thus it's
reportings tons of fall through related errors:
cmds/reflink.c:124:3: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
case 'r':
^
cmds/reflink.c:124:3: note: insert '__attribute__((fallthrough));' to silence this warning
case 'r':
^
__attribute__((fallthrough));
cmds/reflink.c:124:3: note: insert 'break;' to avoid fall-through
case 'r':
^
break;
[CAUSE]
Although gcc is fine with /* fallthrough */ comments, clang is not.
[FIX]
So just introduce a fallthrough macro to handle the situation properly,
and use that macro instead.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Copy of xxhash.[ch] from git://github.com/Cyan4973/xxHash, version
v0.7.1. The include xxh3.h has been commented out as we don't have it
here, otherwise the copy is unchnaged.
Signed-off-by: David Sterba <dsterba@suse.com>
