1 files changed, 82 insertions, 0 deletions
diff --git a/gmp-6.3.0/mpn/s390_64/z13/sqr_basecase.c b/gmp-6.3.0/mpn/s390_64/z13/sqr_basecase.c
new file mode 100644
index 0000000..91dc47c
--- /dev/null
+++ b/gmp-6.3.0/mpn/s390_64/z13/sqr_basecase.c
@@ -0,0 +1,82 @@
+/* mpn_sqr_basecase -- Internal routine to square a natural number of length n.
+   This is a place-holder for z13 to suppress the use of the plain z/arch code.
+   FIXME: This should really be written in assembly with outer-loop early exit.
+
+   THIS IS AN INTERNAL FUNCTION WITH A MUTABLE INTERFACE.  IT IS ONLY
+   SAFE TO REACH THIS FUNCTION THROUGH DOCUMENTED INTERFACES.
+
+
+Copyright 1991-1994, 1996, 1997, 2000-2005, 2008, 2010, 2011, 2017, 2023 Free
+Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of either:
+
+  * the GNU Lesser General Public License as published by the Free
+    Software Foundation; either version 3 of the License, or (at your
+    option) any later version.
+
+or
+
+  * the GNU General Public License as published by the Free Software
+    Foundation; either version 2 of the License, or (at your option) any
+    later version.
+
+or both in parallel, as here.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library.  If not,
+see https://www.gnu.org/licenses/.  */
+
+#include "gmp-impl.h"
+#include "longlong.h"
+
+void
+mpn_sqr_basecase (mp_ptr rp, mp_srcptr up, mp_size_t un)
+{
+  mp_limb_t u0;
+  mp_limb_t cin;
+
+  u0 = up[0];
+  umul_ppmm (cin, rp[0], u0, u0);
+  ++rp;
+
+  if (--un) {
+    u0 = u0 << 1;
+    up += 1;
+
+    rp[un] = mpn_mul_1c (rp, up, un, u0, cin);
+
+    for (;;) {
+      mp_limb_t ci, x0, c0, hi, lo, x1, c1;
+
+      u0 = up[0];
+      ci = -(up[-1] >> (GMP_NUMB_BITS-1)) & u0; // correction term
+      x0 = rp[1] + ci;
+      c0 = x0 < ci;
+      hi, lo;
+
+      umul_ppmm (hi, lo, u0, u0);
+      x1 = x0 + lo;
+      c1 = x1 < lo;
+      cin = hi + c0 + c1;
+      rp[1] = x1;
+      rp += 2;
+
+      if (--un == 0) break;
+      u0 = (up[-1] >> (GMP_NUMB_BITS-1)) + (u0 << 1);
+      up += 1;
+
+      rp[un] = mpn_addmul_1c (rp, up, un, u0, cin);
+    }
+  }
+
+  rp[0] = cin;
+}