diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc32/power5/fpu/w_sqrt.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power5/fpu/w_sqrt.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/sysdeps/powerpc/powerpc32/power5/fpu/w_sqrt.S b/sysdeps/powerpc/powerpc32/power5/fpu/w_sqrt.S index 23559aa192..ed11d5aec4 100644 --- a/sysdeps/powerpc/powerpc32/power5/fpu/w_sqrt.S +++ b/sysdeps/powerpc/powerpc32/power5/fpu/w_sqrt.S @@ -25,19 +25,19 @@ sets the appropriate floating point exceptions. Extended checking is only needed to set errno (via __kernel_standard) if the input value is negative. - + So compare the input value against the absolute value of itself. This will compare equal unless the value is negative (EDOM) or a NAN, in which case we branch to the extend wrapper. If equal we can return the result directly. - + This part of the function looks like a leaf routine, so no need to stack a frame or execute prologue/epilogue code. It is safe to branch directly to w_sqrt as long as the input value (f1) is preserved. Putting the sqrt result into f2 (float parameter 2) allows passing both the input value and sqrt result into the extended wrapper so there is no need to recompute. - + This tactic avoids the overhead of stacking a frame for the normal (non-error) case. Until gcc supports prologue shrink-wrapping this is the best we can do. */ |