Negated fused multiply-add: -(self * a) + b

Apply constant folding to all expressions in a program. (test helper)

Execute forward FFT. # Errors Returns `GpuError::SizeMismatch` if `input.len()` does not equal `size * batch_size`, or propagates backend execution

* Execute forward FFT. * * # Arguments * * * `real` - Real part of input (length must equal size) * * `imag` - Imaginary part

* Execute forward FFT with interleaved input. * * # Arguments * * * `interleaved` - Interleaved complex input [re0, im0, re1, im1,

Execute forward FFT with pre-allocated output. # Errors Returns `GpuError::SizeMismatch` if `input` or `output` lengths do not equal `size * batch_s

Execute a real-to-complex forward FFT. `input` must have length `size`; `output` must have length `size/2 + 1`. # Errors - `GpuError::SizeMismatch`

Free an aligned buffer (for FFI compatibility). # Safety The pointer must have been allocated by `alloc_complex` or `alloc_real`.

Free a Metal buffer handle. Metal buffers are reference-counted and freed automatically; this function is a no-op. # Errors This function currently

Free CUDA buffer (no-op; GPU memory managed in execute). # Errors This function currently cannot return an error; the `Result` signature is retained

Create from complex values.

Create from coprime factors. # Arguments `factors` - Coprime factors for bucket counts `n` - Signal length

Create a GPU buffer from existing data. # Errors Returns `GpuError::InvalidSize` if `data` is empty, or propagates any error from `upload`.

Helper to work around borrow checker: plan takes &mut even though it doesn't mutate.

Create a Gaussian filter. # Arguments `n` - Signal length `sigma` - Standard deviation parameter

Generate a non-twiddle codelet for the given size. # Errors Returns a `syn::Error` when the input token stream does not parse as a valid size literal

Generate a twiddle codelet for the given radix. # Errors Returns a `syn::Error` when the input does not parse as a valid radix literal, or when the r

Generate a `gen_rdft_codelet!(size = N, kind = R2hc|Hc2r)` codelet. # Errors Returns `syn::Error` if the input fails to parse or the size is unsuppor

Generate a SIMD-optimized codelet for the given FFT size. Supports sizes 2, 4, 8 for all ISAs and size 16 (f32 only, AVX-512F or scalar). The macro g