optimizations on cubehash

[avr-crypto-lib.git] / cubehash / xchg.S

diff --git a/cubehash/xchg.S b/cubehash/xchg.S
new file mode 100644 (file)
index 0000000..7e13447
--- /dev/null
+++ b/cubehash/xchg.S
@@ -0,0 +1,44 @@
+/* xchg.S */
+/*
+    This file is part of the AVR-Crypto-Lib.
+    Copyright (C) 2006-2010 Daniel Otte (daniel.otte@rub.de)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+.global xchg32_array
+xchg32_array:
+   movw r26, r24
+   movw r30, r22
+1:
+   ld r24, X
+   ld r25, Z
+   st X+, r25
+   st Z+, r24
+   ld r24, X
+   ld r25, Z
+   st X+, r25
+   st Z+, r24
+   ld r24, X
+   ld r25, Z
+   st X+, r25
+   st Z+, r24
+   ld r24, X
+   ld r25, Z
+   st X+, r25
+   st Z+, r24
+   dec r20
+   brne 1b
+   ret
+