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md5sum: code shrink 

For CONFIG_MD5_SMALL=1:
function                                             old     new   delta
md5_process_block64                                  925     881     -44

For CONFIG_MD5_SMALL=0:
function                                             old     new   delta
md5_process_block64                                 1603    1586     -17

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2015-10-07 19:17:01 +02:00
parent ec046f74a3
commit 305958dbd4
1 changed files with 6 additions and 10 deletions
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16
libbb/hash_md5_sha.c
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@ -137,7 +137,7 @@ static void FAST_FUNC md5_process_block64(md5_ctx_t *ctx)
#if MD5_SMALL > 0
/* Before we start, one word to the strange constants.
They are defined in RFC 1321 as
T[i] = (int)(4294967296.0 * fabs(sin(i))), i=1..64
T[i] = (int)(2^32 * fabs(sin(i))), i=1..64
*/
static const uint32_t C_array[] = {
/* round 1 */
@ -213,7 +213,7 @@ static void FAST_FUNC md5_process_block64(md5_ctx_t *ctx)
case 2:
temp += FH(B, C, D);
break;
case 3:
default: /* case 3 */
temp += FI(B, C, D);
}
temp += words[(int) (*pp++)] + *pc++;
@ -277,10 +277,6 @@ static void FAST_FUNC md5_process_block64(md5_ctx_t *ctx)
#else /* MD5_SMALL == 0 or 1 */
uint32_t A_save = A;
uint32_t B_save = B;
uint32_t C_save = C;
uint32_t D_save = D;
# if MD5_SMALL == 1
const uint32_t *pc;
const char *pp;
@ -425,10 +421,10 @@ static void FAST_FUNC md5_process_block64(md5_ctx_t *ctx)
# undef OP
# endif
/* Add checksum to the starting values */
ctx->hash[0] = A_save + A;
ctx->hash[1] = B_save + B;
ctx->hash[2] = C_save + C;
ctx->hash[3] = D_save + D;
ctx->hash[0] += A;
ctx->hash[1] += B;
ctx->hash[2] += C;
ctx->hash[3] += D;
#endif
}
#undef FF