[v2,06/18] Always use wordsize-64 version of s_round.c.
diff mbox series

Message ID 1575895568-26473-7-git-send-email-stli@linux.ibm.com
State New
Headers show
Series
  • Use GCC builtins for some math functions if desired.
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Commit Message

Stefan Liebler Dec. 9, 2019, 12:45 p.m. UTC
This patch replaces s_round.c in sysdeps/dbl-64 with the one in
sysdeps/dbl-64/wordsize-64 and removes the latter one.
---
 sysdeps/ieee754/dbl-64/s_round.c             | 39 ++++--------
 sysdeps/ieee754/dbl-64/wordsize-64/s_round.c | 66 --------------------
 2 files changed, 12 insertions(+), 93 deletions(-)
 delete mode 100644 sysdeps/ieee754/dbl-64/wordsize-64/s_round.c

Patch
diff mbox series

diff --git a/sysdeps/ieee754/dbl-64/s_round.c b/sysdeps/ieee754/dbl-64/s_round.c
index 1793e575e9..8f4b7cff86 100644
--- a/sysdeps/ieee754/dbl-64/s_round.c
+++ b/sysdeps/ieee754/dbl-64/s_round.c
@@ -22,38 +22,36 @@ 
 
 #include <math_private.h>
 #include <libm-alias-double.h>
+#include <stdint.h>
 
 
 double
 __round (double x)
 {
-  int32_t i0, j0;
-  uint32_t i1;
+  int64_t i0, j0;
 
-  EXTRACT_WORDS (i0, i1, x);
-  j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
-  if (j0 < 20)
+  EXTRACT_WORDS64 (i0, x);
+  j0 = ((i0 >> 52) & 0x7ff) - 0x3ff;
+  if (__glibc_likely (j0 < 52))
     {
       if (j0 < 0)
 	{
-	  i0 &= 0x80000000;
+	  i0 &= UINT64_C (0x8000000000000000);
 	  if (j0 == -1)
-	    i0 |= 0x3ff00000;
-	  i1 = 0;
+	    i0 |= UINT64_C (0x3ff0000000000000);
 	}
       else
 	{
-	  uint32_t i = 0x000fffff >> j0;
-	  if (((i0 & i) | i1) == 0)
+	  uint64_t i = UINT64_C (0x000fffffffffffff) >> j0;
+	  if ((i0 & i) == 0)
 	    /* X is integral.  */
 	    return x;
 
-	  i0 += 0x00080000 >> j0;
+	  i0 += UINT64_C (0x0008000000000000) >> j0;
 	  i0 &= ~i;
-	  i1 = 0;
 	}
     }
-  else if (j0 > 51)
+  else
     {
       if (j0 == 0x400)
 	/* Inf or NaN.  */
@@ -61,21 +59,8 @@  __round (double x)
       else
 	return x;
     }
-  else
-    {
-      uint32_t i = 0xffffffff >> (j0 - 20);
-      if ((i1 & i) == 0)
-	/* X is integral.  */
-	return x;
-
-      uint32_t j = i1 + (1 << (51 - j0));
-      if (j < i1)
-	i0 += 1;
-      i1 = j;
-      i1 &= ~i;
-    }
 
-  INSERT_WORDS (x, i0, i1);
+  INSERT_WORDS64 (x, i0);
   return x;
 }
 libm_alias_double (__round, round)
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_round.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_round.c
deleted file mode 100644
index 1c3fc7f50e..0000000000
--- a/sysdeps/ieee754/dbl-64/wordsize-64/s_round.c
+++ /dev/null
@@ -1,66 +0,0 @@ 
-/* Round double to integer away from zero.
-   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>
-#include <stdint.h>
-
-
-double
-__round (double x)
-{
-  int64_t i0, j0;
-
-  EXTRACT_WORDS64 (i0, x);
-  j0 = ((i0 >> 52) & 0x7ff) - 0x3ff;
-  if (__glibc_likely (j0 < 52))
-    {
-      if (j0 < 0)
-	{
-	  i0 &= UINT64_C(0x8000000000000000);
-	  if (j0 == -1)
-	    i0 |= UINT64_C(0x3ff0000000000000);
-	}
-      else
-	{
-	  uint64_t i = UINT64_C(0x000fffffffffffff) >> j0;
-	  if ((i0 & i) == 0)
-	    /* X is integral.  */
-	    return x;
-
-	  i0 += UINT64_C(0x0008000000000000) >> j0;
-	  i0 &= ~i;
-	}
-    }
-  else
-    {
-      if (j0 == 0x400)
-	/* Inf or NaN.  */
-	return x + x;
-      else
-	return x;
-    }
-
-  INSERT_WORDS64 (x, i0);
-  return x;
-}
-libm_alias_double (__round, round)