1 files changed, 84 insertions, 0 deletions
diff --git a/mpfr/mul_ui.c b/mpfr/mul_ui.c
new file mode 100644
index 000000000..db4c39a90
--- /dev/null
+++ b/mpfr/mul_ui.c
@@ -0,0 +1,84 @@
+/* mpfr_mul_ui -- multiply a floating-point number by a machine integer
+
+Copyright (C) 1999 PolKA project, Inria Lorraine and Loria
+
+This file is part of the MPFR Library.
+
+The MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Library General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at your
+option) any later version.
+
+The MPFR 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+along with the MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include <stdio.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+#include "mpfr.h"
+
+void
+#if __STDC__
+mpfr_mul_ui(mpfr_ptr y, mpfr_srcptr x, unsigned long u, unsigned char RND_MODE)
+#else
+mpfr_mul_ui()
+     mpfr_ptr y; 
+     mpfr_srcptr x; 
+     unsigned long u; 
+     unsigned char RND_MODE; 
+#endif
+{
+  mp_limb_t carry, *my, *old_my; unsigned long c; 
+  unsigned long xsize, ysize, cnt, dif; 
+  TMP_DECL(marker);
+
+  TMP_MARK(marker);
+  my = MANT(y); 
+  ysize = (PREC(y)-1)/BITS_PER_MP_LIMB + 1;
+  xsize = (PREC(x)-1)/BITS_PER_MP_LIMB + 1;
+
+  if (ysize < xsize) {
+      old_my = my; 
+      my = (mp_ptr) TMP_ALLOC (xsize * BYTES_PER_MP_LIMB);
+      dif=0;
+    }
+  else dif=ysize-xsize;
+
+  carry = mpn_mul_1(my+dif, MANT(x), xsize, u);
+  MPN_ZERO(my, dif);
+
+  /* WARNING: count_leading_zeros is undefined for carry=0 */
+  if (carry) count_leading_zeros(cnt, carry);
+  else cnt=BITS_PER_MP_LIMB;
+      
+  c = mpfr_round_raw(my, my, PREC(x), (SIGN(x)<0), 
+		     PREC(y)-BITS_PER_MP_LIMB+cnt, RND_MODE);
+  
+  /* If cnt = 1111111111111 and c = 1 we shall get depressed */
+  if (c && (carry == (((mp_limb_t)1) << (BITS_PER_MP_LIMB - cnt)) - 1))
+    {
+      cnt--; 
+      mpn_rshift(my, my, ysize, BITS_PER_MP_LIMB - cnt); 
+      my[ysize - 1] |= ((mp_limb_t) 1) << (BITS_PER_MP_LIMB - 1);
+    }
+  else
+    {
+      /* Warning: mpn_rshift is undefined for shift=0 */
+      if (cnt!=BITS_PER_MP_LIMB)
+	mpn_rshift(my, my, ysize, BITS_PER_MP_LIMB - cnt); 
+      my[ysize - 1] |= (carry << cnt); 
+    }
+  EXP(y) = EXP(x) + BITS_PER_MP_LIMB - cnt; 
+  if (ysize < xsize) MPN_COPY(old_my, my, ysize);
+  /* set sign */
+  if (SIGN(y) != SIGN(x)) CHANGE_SIGN(y);
+  TMP_FREE(marker);
+}