config BR2_PACKAGE_FFTW
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bool "fftw"
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help
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Library for computing Fast Fourier Transforms.
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This library computes Fast Fourier Transforms (FFT) in one
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or more dimensions. It is extremely fast. This package
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contains the shared library version of the fftw libraries in
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double precision.
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http://www.fftw.org
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if BR2_PACKAGE_FFTW
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config BR2_PACKAGE_FFTW_USE_SSE
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bool
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config BR2_PACKAGE_FFTW_USE_SSE2
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bool
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config BR2_PACKAGE_FFTW_USE_NEON
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bool
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choice
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prompt "fftw precision"
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default BR2_PACKAGE_FFTW_PRECISION_DOUBLE
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help
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Selects fftw precision
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config BR2_PACKAGE_FFTW_PRECISION_SINGLE
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bool "single"
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select BR2_PACKAGE_FFTW_USE_SSE if BR2_X86_CPU_HAS_SSE
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select BR2_PACKAGE_FFTW_USE_SSE2 if BR2_X86_CPU_HAS_SSE2
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select BR2_PACKAGE_FFTW_USE_NEON if BR2_ARM_CPU_HAS_NEON && !BR2_ARM_SOFT_FLOAT
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help
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Compile fftw in single precision, i.e. use 'float' for
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floating point type.
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config BR2_PACKAGE_FFTW_PRECISION_DOUBLE
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bool "double"
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select BR2_PACKAGE_FFTW_USE_SSE2 if BR2_X86_CPU_HAS_SSE2
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help
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Compile fftw in double precision (the default), i.e. use
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'double' for floating point type.
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config BR2_PACKAGE_FFTW_PRECISION_LONG_DOUBLE
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bool "long double"
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# long-double precision require long-double trigonometric routines
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depends on !(BR2_TOOLCHAIN_BUILDROOT_UCLIBC && \
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(BR2_arm || BR2_mips || BR2_mipsel))
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help
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Compile fftw in long double precision, i.e. use 'long double'
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for floating point type.
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config BR2_PACKAGE_FFTW_PRECISION_QUAD
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bool "quad"
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# quad-precision needs to have a gcc with libquadmath
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depends on (BR2_i386 || BR2_x86_64) && BR2_USE_WCHAR
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help
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Compile fftw in quadruple precision, i.e. use '__float128' for
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floating point type.
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endchoice
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config BR2_PACKAGE_FFTW_FAST
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bool "optimise for speed over accuracy"
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help
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Optimise for fast math functions, at the expense of accuracy.
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Say 'y' if you need speed and can live with inaccuracies in
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the results. Say 'n' (the default) if accuracy is of utmost
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importance.
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This basically uses gcc's -Ofast optimisation level, which in
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turn is basically using gcc's -ffast-math. See the gcc manual
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for what this means.
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endif
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