alpha: Remove nearbyint and nearbyintf implementations

The original implementation was written for EV5, which does not
record inexact in the status register for /SU (but no /I) insns.
But EV6 does record the inexact status; the lack of /I simply
means that the exception is suppressed.

Adding feholdexcept becomes the bulk of the overhead, so we might
as well use the default implementation.

diff --git a/ChangeLog b/ChangeLog
index e84fbbf..5eb0d43 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2014-07-03  Richard Henderson  <rth@redhat.com>
 
+       * sysdeps/alpha/fpu/s_nearbyintf.c: Remove file.
+       * sysdeps/alpha/fpu/s_nearbyint.c (__nearbyint): Remove;
+       include sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c.
+
        * sysdeps/alpha/fpu/math_private.h (math_opt_barrier): New.
        (math_force_eval): New.
 

diff --git a/sysdeps/alpha/fpu/s_nearbyint.c b/sysdeps/alpha/fpu/s_nearbyint.c
index ed6c997..dc13910 100644 (file)
--- a/sysdeps/alpha/fpu/s_nearbyint.c
+++ b/sysdeps/alpha/fpu/s_nearbyint.c
@@ -16,33 +16,8 @@
    License along with the GNU C Library.  If not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <math.h>
-#include <math_ldbl_opt.h>
+#include <sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c>
 
-
-double
-__nearbyint (double x)
-{
-  if (isless (fabs (x), 9007199254740992.0))   /* 1 << DBL_MANT_DIG */
-    {
-      double tmp1, new_x;
-      __asm ("cvttq/svd %2,%1\n\t"
-            "cvtqt/d %1,%0\n\t"
-            : "=f"(new_x), "=&f"(tmp1)
-            : "f"(x));
-
-      /* nearbyint(-0.1) == -0, and in general we'll always have the same
-        sign as our input.  */
-      x = copysign(new_x, x);
-    }
-  return x;
-}
-
-weak_alias (__nearbyint, nearbyint)
-#ifdef NO_LONG_DOUBLE
-strong_alias (__nearbyint, __nearbyintl)
-weak_alias (__nearbyint, nearbyintl)
-#endif
 #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1)
 compat_symbol (libm, __nearbyint, nearbyintl, GLIBC_2_1);
 #endif

diff --git a/sysdeps/alpha/fpu/s_nearbyintf.c b/sysdeps/alpha/fpu/s_nearbyintf.c
deleted file mode 100644 (file)
index e769330..0000000
--- a/sysdeps/alpha/fpu/s_nearbyintf.c
+++ /dev/null
@@ -1,46 +0,0 @@
-/* Copyright (C) 2007-2014 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, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <math.h>
-
-float
-__nearbyintf (float x)
-{
-  if (isless (fabsf (x), 16777216.0f)) /* 1 << FLT_MANT_DIG */
-    {
-      /* Note that Alpha S_Floating is stored in registers in a
-        restricted T_Floating format, so we don't even need to
-        convert back to S_Floating in the end.  The initial
-        conversion to T_Floating is needed to handle denormals.  */
-
-      float tmp1, tmp2, new_x;
-
-      __asm ("cvtst/s %3,%2\n\t"
-            "cvttq/svd %2,%1\n\t"
-            "cvtqt/d %1,%0\n\t"
-            : "=f"(new_x), "=&f"(tmp1), "=&f"(tmp2)
-            : "f"(x));
-
-      /* nearbyintf(-0.1) == -0, and in general we'll always have the same
-        sign as our input.  */
-      x = copysignf(new_x, x);
-    }
-  return x;
-}
-
-weak_alias (__nearbyintf, nearbyintf)