diff options
| author |  Gael Guennebaud <g.gael@free.fr> | 2013-08-19 16:02:27 +0200 |
|---|---|---|
| committer | Gael Guennebaud <g.gael@free.fr> | 2013-08-19 16:02:27 +0200 |
| commit | d4dd6aaed2c70b5e32541e96b4864b90dc07c614 (patch) | |
| tree | 1e422e8a2ec61c29beda15eecec10414f45ea618 /doc/PreprocessorDirectives.dox | |
| parent | d3635b08da3b41c7e5201e45edd1882ddb158b35 (diff) | |
Fix bug #642: add vectorization of sqrt for doubles, and make sqrt really safe if EIGEN_FAST_MATH is disabled
Diffstat (limited to 'doc/PreprocessorDirectives.dox')
| -rw-r--r-- | doc/PreprocessorDirectives.dox | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/doc/PreprocessorDirectives.dox b/doc/PreprocessorDirectives.dox index eedd5524a..981083e96 100644 --- a/doc/PreprocessorDirectives.dox +++ b/doc/PreprocessorDirectives.dox @@ -64,9 +64,9 @@ run time. However, these assertions do cost time and can thus be turned off. \c EIGEN_DONT_ALIGN is defined. - \b EIGEN_DONT_VECTORIZE - disables explicit vectorization when defined. Not defined by default, unless alignment is disabled by %Eigen's platform test or the user defining \c EIGEN_DONT_ALIGN. - - \b EIGEN_FAST_MATH - enables some optimizations which might affect the accuracy of the result. The only - optimization this currently includes is single precision sin() and cos() in the present of SSE - vectorization. Defined by default. + - \b EIGEN_FAST_MATH - enables some optimizations which might affect the accuracy of the result. This currently + enables the SSE vectorization of sin() and cos(), and speedups sqrt() for single precision. Defined to 1 by default. + Define it to 0 to disable. - \b EIGEN_UNROLLING_LIMIT - defines the size of a loop to enable meta unrolling. Set it to zero to disable unrolling. The size of a loop here is expressed in %Eigen's own notion of "number of FLOPS", it does not correspond to the number of iterations or the number of instructions. The default is value 100. |