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[zpackage] / tomsfastmath / src / sqr / fp_sqr_comba_4.c

diff --git a/tomsfastmath/src/sqr/fp_sqr_comba_4.c b/tomsfastmath/src/sqr/fp_sqr_comba_4.c
new file mode 100644 (file)
index 0000000..05be36e
--- /dev/null
+++ b/tomsfastmath/src/sqr/fp_sqr_comba_4.c
@@ -0,0 +1,64 @@
+#define TFM_DEFINES
+#include "fp_sqr_comba.c"
+
+#if defined(TFM_SQR4) && FP_SIZE >= 8
+void fp_sqr_comba4(fp_int *A, fp_int *B)
+{
+   fp_digit *a, b[8], c0, c1, c2, sc0, sc1, sc2;
+#ifdef TFM_ISO
+   fp_word tt;
+#endif
+
+   a = A->dp;
+   COMBA_START;
+
+   /* clear carries */
+   CLEAR_CARRY;
+
+   /* output 0 */
+   SQRADD(a[0],a[0]);
+   COMBA_STORE(b[0]);
+
+   /* output 1 */
+   CARRY_FORWARD;
+   SQRADD2(a[0], a[1]);
+   COMBA_STORE(b[1]);
+
+   /* output 2 */
+   CARRY_FORWARD;
+   SQRADD2(a[0], a[2]); SQRADD(a[1], a[1]);
+   COMBA_STORE(b[2]);
+
+   /* output 3 */
+   CARRY_FORWARD;
+   SQRADD2(a[0], a[3]); SQRADD2(a[1], a[2]);
+   COMBA_STORE(b[3]);
+
+   /* output 4 */
+   CARRY_FORWARD;
+   SQRADD2(a[1], a[3]); SQRADD(a[2], a[2]);
+   COMBA_STORE(b[4]);
+
+   /* output 5 */
+   CARRY_FORWARD;
+   SQRADD2(a[2], a[3]);
+   COMBA_STORE(b[5]);
+
+   /* output 6 */
+   CARRY_FORWARD;
+   SQRADD(a[3], a[3]);
+   COMBA_STORE(b[6]);
+   COMBA_STORE2(b[7]);
+   COMBA_FINI;
+
+   B->used = 8;
+   B->sign = FP_ZPOS;
+   memcpy(B->dp, b, 8 * sizeof(fp_digit));
+   fp_clamp(B);
+}
+#endif
+
+
+/* $Source$ */
+/* $Revision$ */
+/* $Date$ */