[Global]: loading init

deps/libtommath/s_mp_sqr_comba.c

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+#include "tommath_private.h"
+#ifdef S_MP_SQR_COMBA_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+/* the jist of squaring...
+ * you do like mult except the offset of the tmpx [one that
+ * starts closer to zero] can't equal the offset of tmpy.
+ * So basically you set up iy like before then you min it with
+ * (ty-tx) so that it never happens.  You double all those
+ * you add in the inner loop
+
+After that loop you do the squares and add them in.
+*/
+
+mp_err s_mp_sqr_comba(const mp_int *a, mp_int *b)
+{
+   int       oldused, pa, ix;
+   mp_digit  W[MP_WARRAY];
+   mp_word   W1;
+   mp_err err;
+
+   /* grow the destination as required */
+   pa = a->used + a->used;
+   if ((err = mp_grow(b, pa)) != MP_OKAY) {
+      return err;
+   }
+
+   /* number of output digits to produce */
+   W1 = 0;
+   for (ix = 0; ix < pa; ix++) {
+      int      tx, ty, iy, iz;
+      mp_word  _W;
+
+      /* clear counter */
+      _W = 0;
+
+      /* get offsets into the two bignums */
+      ty = MP_MIN(a->used-1, ix);
+      tx = ix - ty;
+
+      /* this is the number of times the loop will iterate, essentially
+         while (tx++ < a->used && ty-- >= 0) { ... }
+       */
+      iy = MP_MIN(a->used-tx, ty+1);
+
+      /* now for squaring tx can never equal ty
+       * we halve the distance since they approach at a rate of 2x
+       * and we have to round because odd cases need to be executed
+       */
+      iy = MP_MIN(iy, ((ty-tx)+1)>>1);
+
+      /* execute loop */
+      for (iz = 0; iz < iy; iz++) {
+         _W += (mp_word)a->dp[tx + iz] * (mp_word)a->dp[ty - iz];
+      }
+
+      /* double the inner product and add carry */
+      _W = _W + _W + W1;
+
+      /* even columns have the square term in them */
+      if (((unsigned)ix & 1u) == 0u) {
+         _W += (mp_word)a->dp[ix>>1] * (mp_word)a->dp[ix>>1];
+      }
+
+      /* store it */
+      W[ix] = (mp_digit)_W & MP_MASK;
+
+      /* make next carry */
+      W1 = _W >> (mp_word)MP_DIGIT_BIT;
+   }
+
+   /* setup dest */
+   oldused  = b->used;
+   b->used = a->used+a->used;
+
+   for (ix = 0; ix < pa; ix++) {
+      b->dp[ix] = W[ix] & MP_MASK;
+   }
+
+   /* clear unused digits [that existed in the old copy of c] */
+   s_mp_zero_digs(b->dp + b->used, oldused - b->used);
+
+   mp_clamp(b);
+   return MP_OKAY;
+}
+#endif