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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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9
math/s_csqrtl.c
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@ -1,5 +1,5 @@
/* Complex square root of long double value.
Copyright (C) 1997, 1998, 2005 Free Software Foundation, Inc.
Copyright (C) 1997, 1998, 2005, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Based on an algorithm by Stephen L. Moshier <moshier@world.std.com>.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@ -21,7 +21,6 @@
#include <complex.h>
#include <math.h>
#include <math_private.h>
@ -32,7 +31,7 @@ __csqrtl (__complex__ long 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)
{
@ -61,7 +60,7 @@ __csqrtl (__complex__ long double x)
}
else
{
if (icls == FP_ZERO)
if (__builtin_expect (icls == FP_ZERO, 0))
{
if (__real__ x < 0.0)
{
@ -75,7 +74,7 @@ __csqrtl (__complex__ long double x)
__imag__ res = __copysignl (0.0, __imag__ x);
}
}
else if (rcls == FP_ZERO)
else if (__builtin_expect (rcls == FP_ZERO, 0))
{
long double r = __ieee754_sqrtl (0.5 * fabsl (__imag__ x));