Enable assembler optimizations on earlier ARM cores

* cipher/blowfish-armv6.S => cipher/blowfish-arm.S: adapt to pre-armv6 CPUs.
* cipher/blowfish.c: enable assembly on armv4/armv5 little-endian CPUs.
* cipher/camellia-armv6.S => cipher/camellia-arm.S: adapt to pre-armv6 CPUs.
* cipher/camellia.c, cipher-camellia-glue.c: enable assembly on armv4/armv5
  little-endian CPUs.
* cipher/cast5-armv6.S => cipher/cast5-arm.S: adapt to pre-armv6 CPUs.
* cipher/cast5.c: enable assembly on armv4/armv5 little-endian CPUs.
* cipher/rijndael-armv6.S => cipher/rijndael-arm.S: adapt to pre-armv6 CPUs.
* cipher/rijndael.c: enable assembly on armv4/armv5 little-endian CPUs.
* cipher/twofish-armv6.S => cipher/twofish-arm.S: adapt to pre-armv6 CPUs.
* cipher/twofish.c: enable assembly on armv4/armv5 little-endian CPUs.

--
Our ARMv6 assembly optimized code can be easily adapted to earlier CPUs.
The only incompatible place is rev instruction used to do byte swapping.
Replace it on <= ARMv6 with a series of 4 instructions.

Compare:
                ECB/Stream         CBC             CFB             OFB             CTR
             --------------- --------------- --------------- --------------- ---------------
AES            620ms   610ms   650ms   680ms   620ms   630ms   660ms 660ms   630ms   630ms
CAMELLIA128    720ms   720ms   780ms   790ms   770ms   760ms   780ms 780ms   770ms   760ms
CAMELLIA256    910ms   910ms   970ms   970ms   960ms   950ms   970ms 970ms   960ms   950ms
CAST5          820ms   820ms   930ms   920ms   890ms   860ms   930ms 920ms   880ms   890ms
BLOWFISH       550ms   560ms   650ms   660ms   630ms   600ms   660ms 650ms   610ms   620ms

                ECB/Stream         CBC             CFB             OFB             CTR
             --------------- --------------- --------------- --------------- ---------------
AES            130ms   140ms   180ms   200ms   160ms   170ms   190ms 200ms   170ms   170ms
CAMELLIA128    150ms   160ms   210ms   220ms   200ms   190ms   210ms 220ms   190ms   190ms
CAMELLIA256    180ms   180ms   260ms   240ms   240ms   230ms   250ms 250ms   230ms   230ms
CAST5          170ms   160ms   270ms   120ms   240ms   130ms   260ms 270ms   130ms   120ms
BLOWFISH       160ms   150ms   260ms   110ms   230ms   120ms   250ms 260ms   110ms   120ms

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
[ jk: in camellia.h and twofish.c, USE_ARMV6_ASM => USE_ARM_ASM ]
[ jk: fix blowfish-arm.S when __ARM_FEATURE_UNALIGNED defined ]
[ jk: in twofish.S remove defined(HAVE_ARM_ARCH_V6) ]
[ jk: ARMv6 => ARM in comments ]

1 files changed, 16 insertions, 16 deletions

diff --git a/cipher/twofish.c b/cipher/twofish.c
index d2cabbe8..086df76f 100644
--- a/cipher/twofish.c
+++ b/cipher/twofish.c
@@ -57,11 +57,11 @@
 # define USE_AMD64_ASM 1
 #endif
 
-/* USE_ARMV6_ASM indicates whether to use ARMv6 assembly code. */
-#undef USE_ARMV6_ASM
-#if defined(HAVE_ARM_ARCH_V6) && defined(__ARMEL__)
+/* USE_ARM_ASM indicates whether to use ARM assembly code. */
+#undef USE_ARM_ASM
+#if defined(__ARMEL__)
 # if defined(HAVE_COMPATIBLE_GCC_ARM_PLATFORM_AS)
-#  define USE_ARMV6_ASM 1
+#  define USE_ARM_ASM 1
 # endif
 #endif
 
@@ -754,16 +754,16 @@ extern void _gcry_twofish_amd64_cbc_dec(const TWOFISH_context *c, byte *out,
 extern void _gcry_twofish_amd64_cfb_dec(const TWOFISH_context *c, byte *out,
 					const byte *in, byte *iv);
 
-#elif defined(USE_ARMV6_ASM)
+#elif defined(USE_ARM_ASM)
 
 /* Assembly implementations of Twofish. */
-extern void _gcry_twofish_armv6_encrypt_block(const TWOFISH_context *c,
+extern void _gcry_twofish_arm_encrypt_block(const TWOFISH_context *c,
 					      byte *out, const byte *in);
 
-extern void _gcry_twofish_armv6_decrypt_block(const TWOFISH_context *c,
+extern void _gcry_twofish_arm_decrypt_block(const TWOFISH_context *c,
 					      byte *out, const byte *in);
 
-#else /*!USE_AMD64_ASM && !USE_ARMV6_ASM*/
+#else /*!USE_AMD64_ASM && !USE_ARM_ASM*/
 
 /* Macros to compute the g() function in the encryption and decryption
  * rounds.  G1 is the straight g() function; G2 includes the 8-bit
@@ -837,17 +837,17 @@ twofish_encrypt (void *context, byte *out, const byte *in)
   return /*burn_stack*/ (4*sizeof (void*));
 }
 
-#elif defined(USE_ARMV6_ASM)
+#elif defined(USE_ARM_ASM)
 
 static unsigned int
 twofish_encrypt (void *context, byte *out, const byte *in)
 {
   TWOFISH_context *ctx = context;
-  _gcry_twofish_armv6_encrypt_block(ctx, out, in);
+  _gcry_twofish_arm_encrypt_block(ctx, out, in);
   return /*burn_stack*/ (4*sizeof (void*));
 }
 
-#else /*!USE_AMD64_ASM && !USE_ARMV6_ASM*/
+#else /*!USE_AMD64_ASM && !USE_ARM_ASM*/
 
 static void
 do_twofish_encrypt (const TWOFISH_context *ctx, byte *out, const byte *in)
@@ -889,7 +889,7 @@ twofish_encrypt (void *context, byte *out, const byte *in)
   return /*burn_stack*/ (24+3*sizeof (void*));
 }
 
-#endif /*!USE_AMD64_ASM && !USE_ARMV6_ASM*/
+#endif /*!USE_AMD64_ASM && !USE_ARM_ASM*/
 
 
 /* Decrypt one block.  in and out may be the same. */
@@ -904,17 +904,17 @@ twofish_decrypt (void *context, byte *out, const byte *in)
   return /*burn_stack*/ (4*sizeof (void*));
 }
 
-#elif defined(USE_ARMV6_ASM)
+#elif defined(USE_ARM_ASM)
 
 static unsigned int
 twofish_decrypt (void *context, byte *out, const byte *in)
 {
   TWOFISH_context *ctx = context;
-  _gcry_twofish_armv6_decrypt_block(ctx, out, in);
+  _gcry_twofish_arm_decrypt_block(ctx, out, in);
   return /*burn_stack*/ (4*sizeof (void*));
 }
 
-#else /*!USE_AMD64_ASM && !USE_ARMV6_ASM*/
+#else /*!USE_AMD64_ASM && !USE_ARM_ASM*/
 
 static void
 do_twofish_decrypt (const TWOFISH_context *ctx, byte *out, const byte *in)
@@ -957,7 +957,7 @@ twofish_decrypt (void *context, byte *out, const byte *in)
   return /*burn_stack*/ (24+3*sizeof (void*));
 }
 
-#endif /*!USE_AMD64_ASM && !USE_ARMV6_ASM*/
+#endif /*!USE_AMD64_ASM && !USE_ARM_ASM*/