cirros-testvm/src-cirros/buildroot-2015.05/package/fftw/Config.in

   1 config BR2_PACKAGE_FFTW
   2         bool "fftw"
   3         help
   4           Library for computing Fast Fourier Transforms.
   5
   6           This library computes Fast Fourier Transforms (FFT) in one
   7           or more dimensions. It is extremely fast. This package
   8           contains the shared library version of the fftw libraries in
   9           double precision.
  10
  11           http://www.fftw.org
  12
  13 if BR2_PACKAGE_FFTW
  14
  15 config BR2_PACKAGE_FFTW_USE_SSE
  16         bool
  17
  18 config BR2_PACKAGE_FFTW_USE_SSE2
  19         bool
  20
  21 config BR2_PACKAGE_FFTW_USE_NEON
  22         bool
  23
  24 choice
  25         prompt "fftw precision"
  26         default BR2_PACKAGE_FFTW_PRECISION_DOUBLE
  27         help
  28           Selects fftw precision
  29
  30 config BR2_PACKAGE_FFTW_PRECISION_SINGLE
  31         bool "single"
  32         select BR2_PACKAGE_FFTW_USE_SSE if BR2_X86_CPU_HAS_SSE
  33         select BR2_PACKAGE_FFTW_USE_SSE2 if BR2_X86_CPU_HAS_SSE2
  34         select BR2_PACKAGE_FFTW_USE_NEON if BR2_ARM_CPU_HAS_NEON && !BR2_ARM_SOFT_FLOAT
  35         help
  36           Compile fftw in single precision, i.e. use 'float' for floating
  37           point type.
  38
  39 config BR2_PACKAGE_FFTW_PRECISION_DOUBLE
  40         bool "double"
  41         select BR2_PACKAGE_FFTW_USE_SSE2 if BR2_X86_CPU_HAS_SSE2
  42         help
  43           Compile fftw in double precision (the default), i.e. use 'double'
  44           for floating point type.
  45
  46 config BR2_PACKAGE_FFTW_PRECISION_LONG_DOUBLE
  47         bool "long double"
  48         # long-double precision require long-double trigonometric routines
  49         depends on !(BR2_TOOLCHAIN_BUILDROOT_UCLIBC && \
  50                 (BR2_arm || BR2_mips || BR2_mipsel))
  51         help
  52           Compile fftw in long double precision, i.e. use 'long double'
  53           for floating point type.
  54
  55 config BR2_PACKAGE_FFTW_PRECISION_QUAD
  56         bool "quad"
  57         # quad-precision needs to have a gcc with libquadmath
  58         depends on (BR2_i386 || BR2_x86_64) && BR2_USE_WCHAR
  59         help
  60           Compile fftw in quadruple precision, i.e. use '__float128' for
  61           floating point type.
  62
  63 endchoice
  64
  65 config BR2_PACKAGE_FFTW_FAST
  66         bool "optimise for speed over accuracy"
  67         help
  68           Optimise for fast math functions, at the expense of accuracy.
  69
  70           Say 'y' if you need speed and can live with inaccuracies in
  71           the results. Say 'n' (the default) if accuracy is of utmost
  72           importance.
  73
  74           This basically uses gcc's -Ofast optimisation level, which in
  75           turn is basically using gcc's -ffast-math. See the gcc manual
  76           for what this means.
  77
  78 endif