From: Andreas Schwab <schwab@suse.de>
Date: Thu, 10 Jan 2013 09:42:58 +0000 (+0100)
Subject: Revert "sysdeps/ieee754/ldbl-128ibm/e_expl.c"
X-Git-Tag: glibc-2.18~851
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d1cdd051387a98c79ef8fca4847b8701cfdcd79b;p=platform%2Fupstream%2Fglibc.git

Revert "sysdeps/ieee754/ldbl-128ibm/e_expl.c"

This reverts commit 35eb879e3b7849e86f06658bdb888f7858b30759.
---

diff --git a/sysdeps/ieee754/ldbl-128ibm/e_expl.c b/sysdeps/ieee754/ldbl-128ibm/e_expl.c
index 60229d5..8236390 100644
--- a/sysdeps/ieee754/ldbl-128ibm/e_expl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/e_expl.c
@@ -70,11 +70,11 @@
 static const long double C[] = {
 /* Smallest integer x for which e^x overflows.  */
 #define himark C[0]
- 709.78271289338399678773454114191496482L,
+ 709.08956571282405153382846025171462914L,
 
 /* Largest integer x for which e^x underflows.  */
 #define lomark C[1]
--744.44007192138126231410729844608163411L,
+-744.44007192138121808966388925909996033L,
 
 /* 3x2^96 */
 #define THREEp96 C[2]
@@ -138,12 +138,14 @@ __ieee754_expl (long double x)
   if (isless (x, himark) && isgreater (x, lomark))
     {
       int tval1, tval2, unsafe, n_i, exponent2;
-      long double x22, n, xl;
-      union ibm_extended_long_double ex2_u, scale_u, result;
+      long double x22, n, result, xl;
+      union ibm_extended_long_double ex2_u, scale_u;
       fenv_t oldenv;
 
       feholdexcept (&oldenv);
+#ifdef FE_TONEAREST
       fesetround (FE_TONEAREST);
+#endif
 
       n = __roundl (x*M_1_LN2);
       x = x-n*M_LN2_0;
@@ -164,7 +166,7 @@ __ieee754_expl (long double x)
 		* __expl_table[T_EXPL_RES2 + tval2];
       n_i = (int)n;
       /* 'unsafe' is 1 iff n_1 != 0.  */
-      unsafe = abs (n_i) >= -LDBL_MIN_EXP - 1;
+      unsafe = fabsl(n_i) >= -LDBL_MIN_EXP - 1;
       ex2_u.ieee.exponent += n_i >> unsafe;
       /* Fortunately, there are no subnormal lowpart doubles in
 	 __expl_table, only normal values and zeros.
@@ -202,7 +204,7 @@ __ieee754_expl (long double x)
       /* Return result.  */
       fesetenv (&oldenv);
 
-      result.d = x22 * ex2_u.d + ex2_u.d;
+      result = x22 * ex2_u.d + ex2_u.d;
 
       /* Now we can test whether the result is ultimate or if we are unsure.
 	 In the later case we should probably call a mpn based routine to give
@@ -233,22 +235,10 @@ __ieee754_expl (long double x)
 	    return __ieee754_expl_proc2 (origx);
 	  }
        */
-      if (unsafe)
-	{
-	  /* The scale with denormal number might generated underflow for
-	     first high double multiplication. The exception holding is
-	     to avoid it.  */
-	  if (result.ieee.exponent + scale_u.ieee.exponent
-	      < IBM_EXTENDED_LONG_DOUBLE_BIAS)
-	    {
-	      feholdexcept (&oldenv);
-	      result.d *= scale_u.d;
-	      fesetenv (&oldenv);
-	    }
-	  else
-	    result.d *= scale_u.d;
-	}
-      return result.d;
+      if (!unsafe)
+	return result;
+      else
+	return result * scale_u.d;
     }
   /* Exceptional cases:  */
   else if (isless (x, himark))
diff --git a/sysdeps/ieee754/ldbl-128ibm/w_expl.c b/sysdeps/ieee754/ldbl-128ibm/w_expl.c
index c00b311..a5e72b2 100644
--- a/sysdeps/ieee754/ldbl-128ibm/w_expl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/w_expl.c
@@ -1,44 +1,6 @@
-/*
- * ====================================================
- * 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.
- * ====================================================
- */
-
-
-#include <math.h>
-#include <math_private.h>
+/* Looks like we can use ieee854 w_expl.c as is for IBM extended format. */
 #include <math_ldbl_opt.h>
-
-/*
- * wrapper expl(x)
- */
-static const long double
-o_threshold = 709.78271289338399678773454114191496482L,
-u_threshold = -744.44007192138126231410729844608163411L;
-
-long double __expl(long double x)	/* wrapper exp */
-{
-#ifdef _IEEE_LIBM
-  return __ieee754_expl(x);
-#else
-  long double z;
-  z = __ieee754_expl(x);
-  if (_LIB_VERSION == _IEEE_)
-    return z;
-  if (__finitel(x))
-    {
-      if (x >= o_threshold)
-	return __kernel_standard_l(x,x,206); /* exp overflow */
-      else if (x <= u_threshold)
-	return __kernel_standard_l(x,x,207); /* exp underflow */
-    }
-  return z;
-#endif
-}
-hidden_def (__expl)
+#undef weak_alias
+#define weak_alias(n,a)
+#include <sysdeps/ieee754/ldbl-128/w_expl.c>
 long_double_symbol (libm, __expl, expl);