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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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17
math/s_cexpf.c
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@ -1,5 +1,5 @@
/* Return value of complex exponential function for float complex 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.
@ -21,7 +21,6 @@
#include <complex.h>
#include <fenv.h>
#include <math.h>
#include <math_private.h>
@ -32,10 +31,10 @@ __cexpf (__complex__ float x)
int rcls = fpclassify (__real__ x);
int icls = fpclassify (__imag__ x);
if (rcls >= FP_ZERO)
if (__builtin_expect (rcls >= FP_ZERO, 1))
{
/* Real part is finite. */
if (icls >= FP_ZERO)
if (__builtin_expect (icls >= FP_ZERO, 1))
{
/* Imaginary part is finite. */
float exp_val = __ieee754_expf (__real__ x);
@ -61,15 +60,13 @@ __cexpf (__complex__ float x)
__real__ retval = __nanf ("");
__imag__ retval = __nanf ("");
#ifdef FE_INVALID
feraiseexcept (FE_INVALID);
#endif
}
}
else if (rcls == FP_INFINITE)
else if (__builtin_expect (rcls == FP_INFINITE, 1))
{
/* Real part is infinite. */
if (icls >= FP_ZERO)
if (__builtin_expect (icls >= FP_ZERO, 1))
{
/* Imaginary part is finite. */
float value = signbit (__real__ x) ? 0.0 : HUGE_VALF;
@ -95,10 +92,8 @@ __cexpf (__complex__ float x)
__real__ retval = HUGE_VALF;
__imag__ retval = __nanf ("");
#ifdef FE_INVALID
if (icls == FP_INFINITE)
feraiseexcept (FE_INVALID);
#endif
}
else
{
@ -112,10 +107,8 @@ __cexpf (__complex__ float x)
__real__ retval = __nanf ("");
__imag__ retval = __nanf ("");
#ifdef FE_INVALID
if (rcls != FP_NAN || icls != FP_NAN)
feraiseexcept (FE_INVALID);
#endif
}
return retval;