SIMD (SSE1+MMX or SSE2) implementation of sin, cos, exp and log

Inspired by Intel Approximate Math library, and based on the corresponding algorithms of the cephes math library

The default is to use the SSE1 version. If you define USE_SSE2 the the SSE2 intrinsics will be used in place of the MMX intrinsics. Do not expect any significant performance improvement with SSE2.

Copyright (C) 2010,2011  RJVB - extensions to support 64bit doubles and SSE3,4 . Some SSE4 intrinsics allow considerable gain over the standard functions (floor, ceil, round, ...). "Stub" macros allow to use SSE intrinsics even when not compiling with SSE support. Less elegant than runtime checking but probably faster.

Copyright (C) 2007  Julien Pommier

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
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     claim that you wrote the original software. If you use this software
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  2. Altered source versions must be plainly marked as such, and must not be
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  (this is the zlib license)