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authorUlrich Drepper <drepper@gmail.com>2011-10-22 13:17:30 -0400
committerUlrich Drepper <drepper@gmail.com>2011-10-22 13:17:30 -0400
commit77425c63e72bc0c01d81bc7e9ba4bb41d11679e6 (patch)
treec4fea5ed8070fc251140eba66b009bca1ff0e3b5 /math/s_clog.c
parentbc62c2fb152d6ffec63975d88fd8f1bc3d3b7c01 (diff)
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Add branch predictions to complex math code
Diffstat (limited to 'math/s_clog.c')
-rw-r--r--math/s_clog.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/math/s_clog.c b/math/s_clog.c
index 5e7b8fbdab..ba27140b4b 100644
--- a/math/s_clog.c
+++ b/math/s_clog.c
@@ -1,5 +1,5 @@
 /* Compute complex natural logarithm.
-   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 @@ __clog (__complex__ double x)
   int rcls = fpclassify (__real__ x);
   int icls = fpclassify (__imag__ x);
 
-  if (rcls == FP_ZERO && icls == FP_ZERO)
+  if (__builtin_expect (rcls == FP_ZERO && icls == FP_ZERO, 0))
     {
       /* Real and imaginary part are 0.0.  */
       __imag__ result = signbit (__real__ x) ? M_PI : 0.0;
@@ -39,7 +38,7 @@ __clog (__complex__ double x)
       /* Yes, the following line raises an exception.  */
       __real__ result = -1.0 / fabs (__real__ x);
     }
-  else if (rcls != FP_NAN && icls != FP_NAN)
+  else if (__builtin_expect (rcls != FP_NAN && icls != FP_NAN, 1))
     {
       /* Neither real nor imaginary part is NaN.  */
       __real__ result = __ieee754_log (__ieee754_hypot (__real__ x,