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authorJoseph Myers <joseph@codesourcery.com>2012-11-22 14:59:45 +0000
committerJoseph Myers <joseph@codesourcery.com>2012-11-22 14:59:45 +0000
commitef1e0867c0f6b1a39625f45aa8a8a9d83fe739be (patch)
treed2e415709ef56e81a48b4e4d451a2c2a7f497273 /sysdeps/ieee754/ldbl-128ibm
parent1468ded38eb043991b3b0198ab55cacffb46ec04 (diff)
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Fix ldbl-128ibm powl spurious underflows.
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm')
-rw-r--r--sysdeps/ieee754/ldbl-128ibm/e_powl.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/e_powl.c b/sysdeps/ieee754/ldbl-128ibm/e_powl.c
index 0fd4820e4e..8216c4906b 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)