From 77425c63e72bc0c01d81bc7e9ba4bb41d11679e6 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@gmail.com>
Date: Sat, 22 Oct 2011 13:17:30 -0400
Subject: Add branch predictions to complex math code

---
 math/s_catanhf.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

(limited to 'math/s_catanhf.c')

diff --git a/math/s_catanhf.c b/math/s_catanhf.c
index 7424bda9b9..f3d07f2354 100644
--- a/math/s_catanhf.c
+++ b/math/s_catanhf.c
@@ -1,5 +1,5 @@
 /* Return arc hyperbole tangent for float 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 @@ __catanhf (__complex__ float 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 @@ __catanhf (__complex__ float x)
 	  __imag__ res = __nanf ("");
 	}
     }
-  else if (rcls == FP_ZERO && icls == FP_ZERO)
+  else if (__builtin_expect (rcls == FP_ZERO && icls == FP_ZERO, 0))
     {
       res = x;
     }
   else
     {
-      float i2, num, den;
-
-      i2 = __imag__ x * __imag__ x;
+      float i2 = __imag__ x * __imag__ x;
 
-      num = 1.0 + __real__ x;
+      float num = 1.0 + __real__ x;
       num = i2 + num * num;
 
-      den = 1.0 - __real__ x;
+      float den = 1.0 - __real__ x;
       den = i2 + den * den;
 
       __real__ res = 0.25 * (__ieee754_logf (num) - __ieee754_logf (den));
-- 
cgit v1.2.3