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Add branch predictions to complex math code

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This commit is contained in:
Ulrich Drepper
2011-10-22 13:17:30 -04:00
parent bc62c2fb15
commit 77425c63e7
24 changed files with 101 additions and 132 deletions
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15
math/s_catanh.c
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@ -1,5 +1,5 @@
/* Return arc hyperbole tangent for double value.
Copyright (C) 1997 Free Software Foundation, Inc.
Copyright (C) 1997, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@ -20,7 +20,6 @@
#include <complex.h>
#include <math.h>
#include <math_private.h>
@ -31,7 +30,7 @@ __catanh (__complex__ double x)
int rcls = fpclassify (__real__ x);
int icls = fpclassify (__imag__ x);
if (rcls <= FP_INFINITE || icls <= FP_INFINITE)
if (__builtin_expect (rcls <= FP_INFINITE || icls <= FP_INFINITE, 0))
{
if (icls == FP_INFINITE)
{
@ -52,20 +51,18 @@ __catanh (__complex__ double x)
__imag__ res = __nan ("");
}
}
else if (rcls == FP_ZERO && icls == FP_ZERO)
else if (__builtin_expect (rcls == FP_ZERO && icls == FP_ZERO, 0))
{
res = x;
}
else
{
double i2, num, den;
double i2 = __imag__ x * __imag__ x;
i2 = __imag__ x * __imag__ x;
num = 1.0 + __real__ x;
double num = 1.0 + __real__ x;
num = i2 + num * num;
den = 1.0 - __real__ x;
double den = 1.0 - __real__ x;
den = i2 + den * den;
__real__ res = 0.25 * (__ieee754_log (num) - __ieee754_log (den));