Merge changes between r18730 and r18761 from /fsf/trunk.

git-svn-id: svn://svn.eglibc.org/trunk@18762 7b3dc134-2b1b-0410-93df-9e9f96275f8d

2 files changed, 8 insertions, 6 deletions

diff --git a/libc/sysdeps/ieee754/dbl-64/s_logb.c b/libc/sysdeps/ieee754/dbl-64/s_logb.c
index baa35e14d..17aa94b75 100644
--- a/libc/sysdeps/ieee754/dbl-64/s_logb.c
+++ b/libc/sysdeps/ieee754/dbl-64/s_logb.c
@@ -34,10 +34,12 @@ __logb (double x)
     {
       /* POSIX specifies that denormal number is treated as
          though it were normalized.  */
-      int m1 = (ix == 0) ? 0 : __builtin_clz (ix);
-      int m2 = (lx == 0) ? 0 : __builtin_clz (lx);
-      int ma = (m1 == 0) ? m2 + 32 : m1;
-      return -1022.0 + (double)(11 - ma);
+      int ma;
+      if (ix == 0)
+	ma = __builtin_clz (lx) + 32;
+      else
+	ma = __builtin_clz (ix);
+      rix -= ma - 12;
     }
   return (double) (rix - 1023);
 }
diff --git a/libc/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c b/libc/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c
index 185dd05be..40b888813 100644
--- a/libc/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c
+++ b/libc/sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c
@@ -36,8 +36,8 @@ __logb (double x)
     return x * x;
   if (__builtin_expect (ex == 0, 0))
     {
-      int m = (ix == 0) ? 0 : __builtin_clzll (ix);
-      return -1022.0 + (double)(11 -m);
+      int m = __builtin_clzll (ix);
+      ex -= m - 12;
     }
   return (double) (ex - 1023);
 }