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[zpackage] / tomsfastmath / src / mul / fp_mul_comba_4.c

diff --git a/tomsfastmath/src/mul/fp_mul_comba_4.c b/tomsfastmath/src/mul/fp_mul_comba_4.c
new file mode 100644 (file)
index 0000000..7a3769e
--- /dev/null
+++ b/tomsfastmath/src/mul/fp_mul_comba_4.c
@@ -0,0 +1,52 @@
+#define TFM_DEFINES
+#include "fp_mul_comba.c"
+
+#if defined(TFM_MUL4) && FP_SIZE >= 8
+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
+
+
+/* $Source$ */
+/* $Revision$ */
+/* $Date$ */