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#ifdef TFM_MUL4
void fp_mul_comba4(fp_int *A, fp_int *B, fp_int *C)
{
fp_digit c0, c1, c2, at[8];
memcpy(at, A->dp, 4 * sizeof(fp_digit));
memcpy(at+4, B->dp, 4 * sizeof(fp_digit));
COMBA_START;
COMBA_CLEAR;
/* 0 */
MULADD(at[0], at[4]);
COMBA_STORE(C->dp[0]);
/* 1 */
COMBA_FORWARD;
MULADD(at[0], at[5]); MULADD(at[1], at[4]);
COMBA_STORE(C->dp[1]);
/* 2 */
COMBA_FORWARD;
MULADD(at[0], at[6]); MULADD(at[1], at[5]); MULADD(at[2], at[4]);
COMBA_STORE(C->dp[2]);
/* 3 */
COMBA_FORWARD;
MULADD(at[0], at[7]); MULADD(at[1], at[6]); MULADD(at[2], at[5]); MULADD(at[3], at[4]);
COMBA_STORE(C->dp[3]);
/* 4 */
COMBA_FORWARD;
MULADD(at[1], at[7]); MULADD(at[2], at[6]); MULADD(at[3], at[5]);
COMBA_STORE(C->dp[4]);
/* 5 */
COMBA_FORWARD;
MULADD(at[2], at[7]); MULADD(at[3], at[6]);
COMBA_STORE(C->dp[5]);
/* 6 */
COMBA_FORWARD;
MULADD(at[3], at[7]);
COMBA_STORE(C->dp[6]);
COMBA_STORE2(C->dp[7]);
C->used = 8;
C->sign = A->sign ^ B->sign;
fp_clamp(C);
COMBA_FINI;
}
#endif
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