Always use wordsize-64 version of s_trunc.c.

This patch replaces s_trunc.c in sysdeps/dbl-64 with the one in
sysdeps/dbl-64/wordsize-64 and removes the latter one.
The code is not changed except changes in code style.

Also adjusted the include path in x86_64 and sparc64 files.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

sysdeps/ieee754/dbl-64/s_trunc.c

@@ -27,31 +27,26 @@
 double
 __trunc (double x)
 {
-  int32_t i0, j0;
+  int64_t i0, j0;
-  uint32_t i1;
+  int64_t sx;
-  int sx;
 
-  EXTRACT_WORDS (i0, i1, x);
+  EXTRACT_WORDS64 (i0, x);
-  sx = i0 & 0x80000000;
+  sx = i0 & UINT64_C (0x8000000000000000);
-  j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
+  j0 = ((i0 >> 52) & 0x7ff) - 0x3ff;
-  if (j0 < 20)
+  if (j0 < 52)
     {
       if (j0 < 0)
 	/* The magnitude of the number is < 1 so the result is +-0.  */
-	INSERT_WORDS (x, sx, 0);
+	INSERT_WORDS64 (x, sx);
       else
-	INSERT_WORDS (x, sx | (i0 & ~(0x000fffff >> j0)), 0);
+	INSERT_WORDS64 (x, sx | (i0 & ~(UINT64_C (0x000fffffffffffff) >> j0)));
     }
-  else if (j0 > 51)
+  else
     {
       if (j0 == 0x400)
 	/* x is inf or NaN.  */
 	return x + x;
     }
-  else
-    {
-      INSERT_WORDS (x, i0, i1 & ~(0xffffffffu >> (j0 - 20)));
-    }
 
   return x;
 }

sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c

@@ -1,55 +0,0 @@
-/* Truncate argument to nearest integral value not larger than the argument.
-   Copyright (C) 1997-2019 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
-
-   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
-   <https://www.gnu.org/licenses/>.  */
-
-#define NO_MATH_REDIRECT
-#include <math.h>
-
-#include <math_private.h>
-#include <libm-alias-double.h>
-
-
-double
-__trunc (double x)
-{
-  int64_t i0, j0;
-  int64_t sx;
-
-  EXTRACT_WORDS64 (i0, x);
-  sx = i0 & UINT64_C(0x8000000000000000);
-  j0 = ((i0 >> 52) & 0x7ff) - 0x3ff;
-  if (j0 < 52)
-    {
-      if (j0 < 0)
-	/* The magnitude of the number is < 1 so the result is +-0.  */
-	INSERT_WORDS64 (x, sx);
-      else
-	INSERT_WORDS64 (x, sx | (i0 & ~(UINT64_C(0x000fffffffffffff) >> j0)));
-    }
-  else
-    {
-      if (j0 == 0x400)
-	/* x is inf or NaN.  */
-	return x + x;
-    }
-
-  return x;
-}
-#ifndef __trunc
-libm_alias_double (__trunc, trunc)
-#endif

sysdeps/sparc/sparc64/fpu/multiarch/s_trunc-generic.c

@@ -1,2 +1,2 @@
 #define __trunc __trunc_generic
-#include <sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c>
+#include <sysdeps/ieee754/dbl-64/s_trunc.c>

sysdeps/sparc/sparc64/fpu/multiarch/s_trunc-vis3.c

@@ -20,4 +20,4 @@
 
 #define __trunc __trunc_vis3
 
-#include <sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c>
+#include <sysdeps/ieee754/dbl-64/s_trunc.c>

sysdeps/x86_64/fpu/multiarch/s_trunc-c.c

@@ -1,2 +1,2 @@
 #define __trunc __trunc_c
-#include <sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c>
+#include <sysdeps/ieee754/dbl-64/s_trunc.c>