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Fix bug #642: add vectorization of sqrt for doubles, and make sqrt really safe if EIGEN_FAST_MATH is disabled

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Gael Guennebaud
2013-08-19 16:02:27 +02:00
parent f9149f9ba0
commit 2b50ade6ca
3 changed files with 16 additions and 4 deletions
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doc/PreprocessorDirectives.dox
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@@ -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.