On Thursday 25 October 2007 12:43, Denys Vlasenko wrote:
> Hi Hervert,
>
> Please review and maybe propagate upstream following patches.
>
> camellia3.diff
> Optimize GETU32 to use 4-byte memcpy (modern gcc will convert
> such memcpy to single move instruction on i386).
> Original GETU32 did four byte fetches, and shifted/XORed those.
Signed-off-by: Denys Vlasenko <vda.linux@xxxxxxxxxxxxxx>
--
vda
--- linux-2.6.23.src/crypto/camellia2.c 2007-10-24 19:03:22.000000000 +0100
+++ linux-2.6.23.src/crypto/camellia.c 2007-10-24 19:03:27.000000000 +0100
@@ -330,10 +330,12 @@ static const u32 camellia_sp4404[256] =
* macros
*/
-# define GETU32(pt) (((u32)(pt)[0] << 24) \
- ^ ((u32)(pt)[1] << 16) \
- ^ ((u32)(pt)[2] << 8) \
- ^ ((u32)(pt)[3]))
+# define GETU32(v, pt) \
+ do { \
+ /* latest breed of gcc is clever enough to use move */ \
+ memcpy(&(v), (pt), 4); \
+ (v) = be32_to_cpu(v); \
+ } while(0)
/* rotation right shift 1byte */
#define ROR8(x) (((x) >> 8) + ((x) << 24))
@@ -433,10 +435,11 @@ static void camellia_setup128(const unsi
/**
* k == kll || klr || krl || krr (|| is concatination)
*/
- kll = GETU32(key );
- klr = GETU32(key + 4);
- krl = GETU32(key + 8);
- krr = GETU32(key + 12);
+ GETU32(kll, key );
+ GETU32(klr, key + 4);
+ GETU32(krl, key + 8);
+ GETU32(krr, key + 12);
+
/**
* generate KL dependent subkeys
*/
@@ -687,8 +690,8 @@ static void camellia_setup128(const unsi
static void camellia_setup256(const unsigned char *key, u32 *subkey)
{
- u32 kll,klr,krl,krr; /* left half of key */
- u32 krll,krlr,krrl,krrr; /* right half of key */
+ u32 kll, klr, krl, krr; /* left half of key */
+ u32 krll, krlr, krrl, krrr; /* right half of key */
u32 il, ir, t0, t1, w0, w1; /* temporary variables */
u32 kw4l, kw4r, dw, tl, tr;
u32 subL[34];
@@ -698,14 +701,14 @@ static void camellia_setup256(const unsi
* key = (kll || klr || krl || krr || krll || krlr || krrl || krrr)
* (|| is concatination)
*/
- kll = GETU32(key );
- klr = GETU32(key + 4);
- krl = GETU32(key + 8);
- krr = GETU32(key + 12);
- krll = GETU32(key + 16);
- krlr = GETU32(key + 20);
- krrl = GETU32(key + 24);
- krrr = GETU32(key + 28);
+ GETU32(kll, key );
+ GETU32(klr, key + 4);
+ GETU32(krl, key + 8);
+ GETU32(krr, key + 12);
+ GETU32(krll, key + 16);
+ GETU32(krlr, key + 20);
+ GETU32(krrl, key + 24);
+ GETU32(krrr, key + 28);
/* generate KL dependent subkeys */
/* kw1 */
