aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/ieee754/ldbl-96
diff options
context:
space:
mode:
authorAndreas Schwab <schwab@linux-m68k.org>2012-05-25 11:57:33 +0200
committerAndreas Schwab <schwab@linux-m68k.org>2012-05-26 13:53:22 +0200
commit25dbcb277a9dea5f241c0b888a30b9341310d941 (patch)
tree74c7933f325f44fed6f2f15fd87c59fd4752be37 /sysdeps/ieee754/ldbl-96
parentd81dcb356909937b0c8e9c69ff0be27f51aaa07a (diff)
downloadglibc-25dbcb277a9dea5f241c0b888a30b9341310d941.tar
glibc-25dbcb277a9dea5f241c0b888a30b9341310d941.tar.gz
glibc-25dbcb277a9dea5f241c0b888a30b9341310d941.tar.bz2
glibc-25dbcb277a9dea5f241c0b888a30b9341310d941.zip
Optimize handling of denormals in logb/logbf/logbl
Diffstat (limited to 'sysdeps/ieee754/ldbl-96')
-rw-r--r--sysdeps/ieee754/ldbl-96/s_logbl.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/sysdeps/ieee754/ldbl-96/s_logbl.c b/sysdeps/ieee754/ldbl-96/s_logbl.c
index d8ad4bcfcf..4289be1933 100644
--- a/sysdeps/ieee754/ldbl-96/s_logbl.c
+++ b/sysdeps/ieee754/ldbl-96/s_logbl.c
@@ -38,10 +38,12 @@ __logbl (long 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 -16382.0 - (long double)(ma);
+ int ma;
+ if (ix == 0)
+ ma = __builtin_clz (lx) + 32;
+ else
+ ma = __builtin_clz (ix);
+ es -= ma - 1;
}
return (long double) (es - 16383);
}