Clean up ldbl-128 / ldbl-128ibm expm1l dead code (bug 16415).

The ldbl-128 and ldbl-128ibm expm1l implementations have code to
handle +Inf and finite arguments above an overflow threshold.  Since
they now use __expl for large positive arguments to fix other
problems, this code is unreachable; this patch removes it.

Tested for mips64 and powerpc.

	[BZ #16415]
	* sysdeps/ieee754/ldbl-128/s_expm1l.c (maxlog): Remove variable.
	(__expm1l): Remove code to handle positive infinity and overflow.
	* sysdeps/ieee754/ldbl-128ibm/s_expm1l.c (maxlog): Remove
	variable.
	(__expm1l): Remove code to handle positive infinity and overflow.

2 files changed, 4 insertions, 32 deletions

diff --git a/sysdeps/ieee754/ldbl-128/s_expm1l.c b/sysdeps/ieee754/ldbl-128/s_expm1l.c
index 573d00b..f1a68c8 100644
--- a/sysdeps/ieee754/ldbl-128/s_expm1l.c
+++ b/sysdeps/ieee754/ldbl-128/s_expm1l.c
@@ -84,8 +84,6 @@ static const long double
 
   C1 = 6.93145751953125E-1L,
   C2 = 1.428606820309417232121458176568075500134E-6L,
-/* ln (2^16384 * (1 - 2^-113)) */
-  maxlog = 1.1356523406294143949491931077970764891253E4L,
 /* ln 2^-114 */
   minarg = -7.9018778583833765273564461846232128760607E1L, big = 1e4932L;
 
@@ -110,14 +108,9 @@ __expm1l (long double x)
     }
   if (ix >= 0x7fff0000)
     {
-      /* Infinity. */
+      /* Infinity (which must be negative infinity). */
       if (((ix & 0xffff) | u.parts32.w1 | u.parts32.w2 | u.parts32.w3) == 0)
-	{
-	  if (sign)
-	    return -1.0L;
-	  else
-	    return x;
-	}
+	return -1.0L;
       /* NaN. No invalid exception. */
       return x;
     }
@@ -126,13 +119,6 @@ __expm1l (long double x)
   if ((ix == 0) && (u.parts32.w1 | u.parts32.w2 | u.parts32.w3) == 0)
     return x;
 
-  /* Overflow.  */
-  if (x > maxlog)
-    {
-      __set_errno (ERANGE);
-      return (big * big);
-    }
-
   /* Minimum value.  */
   if (x < minarg)
     return (4.0/big - 1.0L);
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_expm1l.c b/sysdeps/ieee754/ldbl-128ibm/s_expm1l.c
index 0464f79..66f75e1 100644
--- a/sysdeps/ieee754/ldbl-128ibm/s_expm1l.c
+++ b/sysdeps/ieee754/ldbl-128ibm/s_expm1l.c
@@ -82,8 +82,6 @@ static const long double
 
   C1 = 6.93145751953125E-1L,
   C2 = 1.428606820309417232121458176568075500134E-6L,
-/* ln (2^16384 * (1 - 2^-113)) */
-  maxlog = 1.1356523406294143949491931077970764891253E4L,
 /* ln 2^-114 */
   minarg = -7.9018778583833765273564461846232128760607E1L, big = 1e290L;
 
@@ -105,14 +103,9 @@ __expm1l (long double x)
     return __expl (x);
   if (ix >= 0x7ff00000)
     {
-      /* Infinity. */
+      /* Infinity (which must be negative infinity). */
       if (((ix - 0x7ff00000) | lx) == 0)
-	{
-	  if (sign)
-	    return -1.0L;
-	  else
-	    return x;
-	}
+	return -1.0L;
       /* NaN. No invalid exception. */
       return x;
     }
@@ -121,13 +114,6 @@ __expm1l (long double x)
   if ((ix | lx) == 0)
     return x;
 
-  /* Overflow.  */
-  if (x > maxlog)
-    {
-      __set_errno (ERANGE);
-      return (big * big);
-    }
-
   /* Minimum value.  */
   if (x < minarg)
     return (4.0/big - 1.0L);