GNU C Library master sources branch master updated. glibc-2.16-ports-merge-762-gef1e086

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- Log -----------------------------------------------------------------
http://sources.redhat.com/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=ef1e0867c0f6b1a39625f45aa8a8a9d83fe739be

commit ef1e0867c0f6b1a39625f45aa8a8a9d83fe739be
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Nov 22 14:59:45 2012 +0000

    Fix ldbl-128ibm powl spurious underflows.

diff --git a/ChangeLog b/ChangeLog
index 34e93e5..ff04e57 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2012-11-22  Joseph Myers  <joseph@codesourcery.com>
 
+	[BZ #14811]
+	* sysdeps/ieee754/ldbl-128ibm/e_powl.c (__ieee754_powl): Saturate
+	nonzero exponents with absolute value below 0x1p-117 to +/-
+	0x1p-117.
+
 	[BZ #14869]
 	* sysdeps/ieee754/ldbl-128ibm/e_hypotl.c (__ieee754_hypotl): Scale
 	up arguments below 2**-450, not just those below 2**-500.
diff --git a/sysdeps/ieee754/ldbl-128ibm/e_powl.c b/sysdeps/ieee754/ldbl-128ibm/e_powl.c
index 0fd4820..8216c49 100644
--- a/sysdeps/ieee754/ldbl-128ibm/e_powl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/e_powl.c
@@ -149,7 +149,7 @@ __ieee754_powl (long double x, long double y)
 {
   long double z, ax, z_h, z_l, p_h, p_l;
   long double y1, t1, t2, r, s, t, u, v, w;
-  long double s2, s_h, s_l, t_h, t_l;
+  long double s2, s_h, s_l, t_h, t_l, ay;
   int32_t i, j, k, yisint, n;
   u_int32_t ix, iy;
   int32_t hx, hy;
@@ -284,6 +284,10 @@ __ieee754_powl (long double x, long double y)
 	return (hy > 0) ? huge * huge : tiny * tiny;
     }
 
+  ay = y > 0 ? y : -y;
+  if (ay < 0x1p-117)
+    y = y < 0 ? -0x1p-117 : 0x1p-117;
+
   n = 0;
   /* take care subnormal number */
   if (ix < 0x00100000)

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                            |    5 +++++
 sysdeps/ieee754/ldbl-128ibm/e_powl.c |    6 +++++-
 2 files changed, 10 insertions(+), 1 deletions(-)


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