1 files changed, 53 insertions, 0 deletions
diff --git a/sysdeps/alpha/fpu/s_trunc.c b/sysdeps/alpha/fpu/s_trunc.c
new file mode 100644
index 0000000000..1c1a66673f
--- /dev/null
+++ b/sysdeps/alpha/fpu/s_trunc.c
@@ -0,0 +1,53 @@
+/* Copyright (C) 2007 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Richard Henderson.
+
+   The GNU C 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 2.1 of the License, or (at your option) any later version.
+
+   The GNU C 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 C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <math.h>
+#include <math_ldbl_opt.h>
+
+
+/* Use the chopped rounding mode conversion instructions to implement trunc. */
+
+double
+__trunc (double x)
+{
+  double two52 = copysign (0x1.0p52, x);
+  double r, tmp;
+  
+  __asm (
+#ifdef _IEEE_FP_INEXACT
+	 "addt/suic %2, %3, %1\n\tsubt/suic %1, %3, %0"
+#else
+	 "addt/suc %2, %3, %1\n\tsubt/suc %1, %3, %0"
+#endif
+	 : "=&f"(r), "=&f"(tmp)
+	 : "f"(x), "f"(two52));
+
+  /* trunc(-0) == -0, and in general we'll always have the same
+     sign as our input.  */
+  return copysign (r, x);
+}
+
+weak_alias (__trunc, trunc)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__trunc, __truncl)
+weak_alias (__trunc, truncl)
+#endif
+#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
+compat_symbol (libm, __trunc, truncl, GLIBC_2_0);
+#endif