From d3833cb69c7ff42ac8df68ed7b646c98c3a32eb8 Mon Sep 17 00:00:00 2001
From: Stefan Liebler <stli@linux.ibm.com>
Date: Wed, 11 Dec 2019 15:09:16 +0100
Subject: [PATCH 04/28] Always use wordsize-64 version of s_ceil.c.
 
This patch replaces s_ceil.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>
(cherry picked from commit 9f234eafe8698fd9a441ca2309a299d0bd771156)
---
 sysdeps/ieee754/dbl-64/s_ceil.c               | 59 ++++++-------------
 sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c   | 51 ----------------
 .../sparc64/fpu/multiarch/s_ceil-generic.c    |  2 +-
 .../sparc/sparc64/fpu/multiarch/s_ceil-vis3.c |  2 +-
 sysdeps/x86_64/fpu/multiarch/s_ceil-c.c       |  2 +-
 5 files changed, 21 insertions(+), 95 deletions(-)
 delete mode 100644 sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c
 
diff --git a/sysdeps/ieee754/dbl-64/s_ceil.c b/sysdeps/ieee754/dbl-64/s_ceil.c
index 5a7434c737..3becdfc515 100644
--- a/sysdeps/ieee754/dbl-64/s_ceil.c
+++ b/sysdeps/ieee754/dbl-64/s_ceil.c
@@ -24,61 +24,38 @@
 double
 __ceil (double x)
 {
-  int32_t i0, i1, j0;
-  uint32_t i, j;
-  EXTRACT_WORDS (i0, i1, x);
-  j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
-  if (j0 < 20)
+  int64_t i0, i;
+  int32_t j0;
+  EXTRACT_WORDS64 (i0, x);
+  j0 = ((i0 >> 52) & 0x7ff) - 0x3ff;
+  if (j0 <= 51)
     {
       if (j0 < 0)
 	{
-	  /* return 0*sign(x) if |x|<1 */
+	  /* return 0 * sign(x) if |x| < 1  */
 	  if (i0 < 0)
-	    {
-	      i0 = 0x80000000; i1 = 0;
-	    }
-	  else if ((i0 | i1) != 0)
-	    {
-	      i0 = 0x3ff00000; i1 = 0;
-	    }
+	    i0 = INT64_C (0x8000000000000000);
+	  else if (i0 != 0)
+	    i0 = INT64_C (0x3ff0000000000000);
 	}
       else
 	{
-	  i = (0x000fffff) >> j0;
-	  if (((i0 & i) | i1) == 0)
-	    return x;                        /* x is integral */
+	  i = INT64_C (0x000fffffffffffff) >> j0;
+	  if ((i0 & i) == 0)
+	    return x;			/* x is integral  */
 	  if (i0 > 0)
-	    i0 += (0x00100000) >> j0;
-	  i0 &= (~i); i1 = 0;
+	    i0 += UINT64_C (0x0010000000000000) >> j0;
+	  i0 &= ~i;
 	}
     }
-  else if (j0 > 51)
+  else
     {
       if (j0 == 0x400)
-	return x + x;                   /* inf or NaN */
+	return x + x;			/* inf or NaN  */
       else
-	return x;                       /* x is integral */
-    }
-  else
-    {
-      i = ((uint32_t) (0xffffffff)) >> (j0 - 20);
-      if ((i1 & i) == 0)
-	return x;                       /* x is integral */
-      if (i0 > 0)
-	{
-	  if (j0 == 20)
-	    i0 += 1;
-	  else
-	    {
-	      j = i1 + (1 << (52 - j0));
-	      if (j < i1)
-		i0 += 1;                /* got a carry */
-	      i1 = j;
-	    }
-	}
-      i1 &= (~i);
+	return x;			/* x is integral  */
     }
-  INSERT_WORDS (x, i0, i1);
+  INSERT_WORDS64 (x, i0);
   return x;
 }
 #ifndef __ceil
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c
deleted file mode 100644
index b99829d2b0..0000000000
--- a/sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c
+++ /dev/null
@@ -1,51 +0,0 @@
-/* @(#)s_ceil.c 5.1 93/09/24 */
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunPro, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
-
-/*
- * ceil(x)
- * Return x rounded toward -inf to integral value
- * Method:
- *	Bit twiddling.
- */
-
-#include <math.h>
-#include <math_private.h>
-#include <libm-alias-double.h>
-
-double
-__ceil(double x)
-{
-	int64_t i0,i;
-	int32_t j0;
-	EXTRACT_WORDS64(i0,x);
-	j0 = ((i0>>52)&0x7ff)-0x3ff;
-	if(j0<=51) {
-	    if(j0<0) {
-	      /* return 0*sign(x) if |x|<1 */
-	      if(i0<0) {i0=INT64_C(0x8000000000000000);}
-	      else if(i0!=0) { i0=INT64_C(0x3ff0000000000000);}
-	    } else {
-		i = INT64_C(0x000fffffffffffff)>>j0;
-		if((i0&i)==0) return x; /* x is integral */
-		if(i0>0) i0 += UINT64_C(0x0010000000000000)>>j0;
-		i0 &= (~i);
-	    }
-	} else {
-	    if(j0==0x400) return x+x;	/* inf or NaN */
-	    else return x;		/* x is integral */
-	}
-	INSERT_WORDS64(x,i0);
-	return x;
-}
-#ifndef __ceil
-libm_alias_double (__ceil, ceil)
-#endif
diff --git a/sysdeps/sparc/sparc64/fpu/multiarch/s_ceil-generic.c b/sysdeps/sparc/sparc64/fpu/multiarch/s_ceil-generic.c
index febea745e1..80f68b6766 100644
--- a/sysdeps/sparc/sparc64/fpu/multiarch/s_ceil-generic.c
+++ b/sysdeps/sparc/sparc64/fpu/multiarch/s_ceil-generic.c
@@ -1,2 +1,2 @@
 #define __ceil __ceil_generic
-#include <sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c>
+#include <sysdeps/ieee754/dbl-64/s_ceil.c>
diff --git a/sysdeps/sparc/sparc64/fpu/multiarch/s_ceil-vis3.c b/sysdeps/sparc/sparc64/fpu/multiarch/s_ceil-vis3.c
index a03a0090f0..59822e0f8c 100644
--- a/sysdeps/sparc/sparc64/fpu/multiarch/s_ceil-vis3.c
+++ b/sysdeps/sparc/sparc64/fpu/multiarch/s_ceil-vis3.c
@@ -20,4 +20,4 @@
 
 #define __ceil __ceil_vis3
 
-#include <sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c>
+#include <sysdeps/ieee754/dbl-64/s_ceil.c>
diff --git a/sysdeps/x86_64/fpu/multiarch/s_ceil-c.c b/sysdeps/x86_64/fpu/multiarch/s_ceil-c.c
index 6a5ea3ff27..ada28baa1a 100644
--- a/sysdeps/x86_64/fpu/multiarch/s_ceil-c.c
+++ b/sysdeps/x86_64/fpu/multiarch/s_ceil-c.c
@@ -1,2 +1,2 @@
 #define __ceil __ceil_c
-#include <sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c>
+#include <sysdeps/ieee754/dbl-64/s_ceil.c>
-- 
2.18.2