yfft 0.1.0

Simple fast Fourier transform library optimized for small, power-of-two, single precision transforms and x86 systems 
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//! Defines FFT kernels optimized for x86 and x86_64 systems.

use super::super::Num;
use super::utils;
use super::{Kernel, KernelCreationParams, KernelParams, KernelType, SliceAccessor};

mod bitreversal;
#[cfg(target_feature = "avx")]
mod x86avxbitreversal;
#[cfg(target_feature = "avx")]
mod x86avxf32radix2;
#[cfg(target_feature = "avx")]
mod x86avxf32radix4;
#[cfg(target_feature = "avx")]
mod x86avxf32realfft;
mod x86sse1bitreversal;
mod x86sse1radix2;
mod x86sse1radix4;
mod x86sse1realfft;
mod x86sse2;
#[cfg(target_feature = "sse3")]
mod x86sse3f32radix4;
#[cfg(target_feature = "sse3")]
mod x86sse3f32realfft;

#[cfg(not(target_feature = "avx"))]
mod x86avxf32radix2 {
    pub fn new_x86_avx_f32_radix2_kernel<T>(
        _: &super::KernelCreationParams,
    ) -> Option<Box<super::Kernel<T>>> {
        None
    }
}

#[cfg(not(target_feature = "avx"))]
mod x86avxf32radix4 {
    pub fn new_x86_avx_f32_radix4_kernel<T>(
        _: &super::KernelCreationParams,
    ) -> Option<Box<super::Kernel<T>>> {
        None
    }
}

#[cfg(not(target_feature = "avx"))]
mod x86avxf32realfft {
    pub fn new_x86_avx_f32_real_fft_pre_post_process_kernel<T>(
        _len: usize,
        _inverse: bool,
    ) -> Option<Box<super::Kernel<T>>> {
        None
    }
}

#[cfg(not(target_feature = "sse3"))]
mod x86sse3f32radix4 {
    pub fn new_x86_sse3_f32_radix4_kernel<T>(
        _: &super::KernelCreationParams,
    ) -> Option<Box<super::Kernel<T>>> {
        None
    }
}

#[cfg(not(target_feature = "sse3"))]
mod x86sse3f32realfft {
    pub fn new_x86_sse3_f32_real_fft_pre_post_process_kernel<T>(
        _len: usize,
        _inverse: bool,
    ) -> Option<Box<super::Kernel<T>>> {
        None
    }
}

#[cfg(not(target_feature = "avx"))]
mod x86avxbitreversal {
    pub fn new_x86_avx_bit_reversal_kernel<T>(_: &Vec<usize>) -> Option<Box<super::Kernel<T>>> {
        None
    }
    pub fn new_x86_avx_radix2_bit_reversal_kernel<T>(
        _: &Vec<usize>,
    ) -> Option<Box<super::Kernel<T>>> {
        None
    }
    pub fn new_x86_avx_radix4_bit_reversal_kernel<T>(
        _: &Vec<usize>,
    ) -> Option<Box<super::Kernel<T>>> {
        None
    }
}

pub fn new_x86_kernel<T>(cparams: &KernelCreationParams) -> Option<Box<Kernel<T>>>
where
    T: Num,
{
    None.or_else(|| x86avxf32radix2::new_x86_avx_f32_radix2_kernel(cparams))
        .or_else(|| x86avxf32radix4::new_x86_avx_f32_radix4_kernel(cparams))
        .or_else(|| x86sse3f32radix4::new_x86_sse3_f32_radix4_kernel(cparams))
        .or_else(|| x86sse2::new_x86_sse2_kernel(cparams))
        .or_else(|| x86sse1radix2::new_x86_sse_radix2_kernel(cparams))
        .or_else(|| x86sse1radix4::new_x86_sse_radix4_kernel(cparams))
}

pub unsafe fn new_x86_bit_reversal_kernel<T>(indices: &Vec<usize>) -> Option<Box<Kernel<T>>>
where
    T: Num,
{
    let radix2 = indices.len() % 2 == 0
        && (0..indices.len() / 2).all(|i| indices[i + indices.len() / 2] == indices[i] + 1);
    let radix4 = indices.len() % 4 == 0
        && (0..indices.len() / 4).all(|i| {
            indices[i + indices.len() / 4] == indices[i] + 1
                && indices[i + indices.len() / 4 * 2] == indices[i] + 2
                && indices[i + indices.len() / 4 * 3] == indices[i] + 3
        });
    None.or_else(|| {
        if radix4 {
            x86avxbitreversal::new_x86_avx_radix4_bit_reversal_kernel(indices)
        } else {
            None
        }
    })
    .or_else(|| {
        if radix2 {
            x86avxbitreversal::new_x86_avx_radix2_bit_reversal_kernel(indices)
        } else {
            None
        }
    })
    .or_else(|| x86avxbitreversal::new_x86_avx_bit_reversal_kernel(indices))
    .or_else(|| bitreversal::new_x86_bit_reversal_kernel(indices))
}

pub fn new_x86_real_fft_pre_post_process_kernel<T>(
    len: usize,
    inverse: bool,
) -> Option<Box<Kernel<T>>>
where
    T: Num,
{
    None.or_else(|| {
        x86avxf32realfft::new_x86_avx_f32_real_fft_pre_post_process_kernel(len, inverse)
    })
    .or_else(|| x86sse3f32realfft::new_x86_sse3_f32_real_fft_pre_post_process_kernel(len, inverse))
    .or_else(|| x86sse1realfft::new_x86_sse_real_fft_pre_post_process_kernel(len, inverse))
}