lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-30 22:43:12 +03:00
Code Activity

Optimize use of isnan, isinf, finite

Browse Source
This commit is contained in:
Ulrich Drepper
2011-10-08 10:18:26 -04:00
parent 187da0aedc
commit 7edb55ce06
35 changed files with 236 additions and 63 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
math/multc3.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 2005, 2006 Free Software Foundation, Inc.
/* Copyright (C) 2005, 2006, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson <rth@redhat.com>, 2005.
@ -39,28 +39,29 @@ __multc3 (long double a, long double b, long double c, long double d)
{
/* Recover infinities that computed as NaN + iNaN. */
bool recalc = 0;
if (isinf (a) || isinf (b))
if (__isinf_nsl (a) || __isinf_nsl (b))
{
/* z is infinite. "Box" the infinity and change NaNs in
the other factor to 0. */
a = __copysignl (isinf (a) ? 1 : 0, a);
b = __copysignl (isinf (b) ? 1 : 0, b);
a = __copysignl (__isinf_nsl (a) ? 1 : 0, a);
b = __copysignl (__isinf_nsl (b) ? 1 : 0, b);
if (isnan (c)) c = __copysignl (0, c);
if (isnan (d)) d = __copysignl (0, d);
recalc = 1;
}
if (isinf (c) || isinf (d))
if (__isinf_nsl (c) || __isinf_nsl (d))
{
/* w is infinite. "Box" the infinity and change NaNs in
the other factor to 0. */
c = __copysignl (isinf (c) ? 1 : 0, c);
d = __copysignl (isinf (d) ? 1 : 0, d);
c = __copysignl (__isinf_nsl (c) ? 1 : 0, c);
d = __copysignl (__isinf_nsl (d) ? 1 : 0, d);
if (isnan (a)) a = __copysignl (0, a);
if (isnan (b)) b = __copysignl (0, b);
recalc = 1;
}
if (!recalc
&& (isinf (ac) || isinf (bd) || isinf (ad) || isinf (bc)))
&& (__isinf_nsl (ac) || __isinf_nsl (bd)
|| __isinf_nsl (ad) || __isinf_nsl (bc)))
{
/* Recover infinities from overflow by changing NaNs to 0. */
if (isnan (a)) a = __copysignl (0, a);