Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpn / cray / ieee / sqr_basecase.c

diff --git a/gmp/mpn/cray/ieee/sqr_basecase.c b/gmp/mpn/cray/ieee/sqr_basecase.c
new file mode 100644 (file)
index 0000000..92a9a0e
--- /dev/null
+++ b/gmp/mpn/cray/ieee/sqr_basecase.c
@@ -0,0 +1,95 @@
+/* Cray PVP/IEEE mpn_sqr_basecase.
+
+Copyright 2000, 2001 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 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.
+
+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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+/* This is just mpn_mul_basecase with trivial modifications.  */
+
+#include <intrinsics.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+mpn_sqr_basecase (mp_ptr rp,
+                 mp_srcptr up, mp_size_t un)
+{
+  mp_limb_t cy[un + un];
+  mp_limb_t ul;
+  mp_limb_t a, b, r, s0, s1, c0, c1;
+  mp_size_t i, j;
+  int more_carries;
+
+  for (i = 0; i < un + un; i++)
+    {
+      rp[i] = 0;
+      cy[i] = 0;
+    }
+
+#pragma _CRI novector
+  for (j = 0; j < un; j++)
+    {
+      ul = up[j];
+
+      a = up[0] * ul;
+      r = rp[j];
+      s0 = a + r;
+      rp[j] = s0;
+      c0 = ((a & r) | ((a | r) & ~s0)) >> 63;
+      cy[j] += c0;
+
+#pragma _CRI ivdep
+      for (i = 1; i < un; i++)
+       {
+         a = up[i] * ul;
+         b = _int_mult_upper (up[i - 1], ul);
+         s0 = a + b;
+         c0 = ((a & b) | ((a | b) & ~s0)) >> 63;
+         r = rp[j + i];
+         s1 = s0 + r;
+         rp[j + i] = s1;
+         c1 = ((s0 & r) | ((s0 | r) & ~s1)) >> 63;
+         cy[j + i] += c0 + c1;
+       }
+      rp[j + un] = _int_mult_upper (up[un - 1], ul);
+    }
+
+  more_carries = 0;
+#pragma _CRI ivdep
+  for (i = 1; i < un + un; i++)
+    {
+      r = rp[i];
+      c0 = cy[i - 1];
+      s0 = r + c0;
+      rp[i] = s0;
+      c0 = (r & ~s0) >> 63;
+      more_carries += c0;
+    }
+  /* If that second loop generated carry, handle that in scalar loop.  */
+  if (more_carries)
+    {
+      mp_limb_t cyrec = 0;
+      for (i = 1; i < un + un; i++)
+       {
+         r = rp[i];
+         c0 = (r < cy[i - 1]);
+         s0 = r + cyrec;
+         rp[i] = s0;
+         c1 = (r & ~s0) >> 63;
+         cyrec = c0 | c1;
+       }
+    }
+}