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