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Only check whether fft is power of two when not using rustfft-backend #19

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Merged
wizenink merged 2 commits into from
Dec 21, 2025
Merged

Only check whether fft is power of two when not using rustfft-backend #19

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81cf44f
Only check fft is power of two when not using rustfft-backend
danny900714 Dec 21, 2025
fc3dd1e
Add some tests for microfft
wizenink Dec 21, 2025
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2 changes: 1 addition & 1 deletion src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -157,7 +157,7 @@ impl<T: Float + FromPrimitive + fmt::Debug> StftConfig<T> {
window: WindowType,
reconstruction_mode: ReconstructionMode,
) -> Result<Self, ConfigError<T>> {
if fft_size == 0 || !fft_size.is_power_of_two() {
if fft_size == 0 || !(cfg!(feature = "rustfft-backend") || fft_size.is_power_of_two()) {
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@gemini-code-assist gemini-code-assist bot Dec 21, 2025

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medium

While logically correct, this condition can be made more readable. By applying De Morgan's law, you can express the logic without negating a grouped expression, which is often easier to reason about. The rewritten form !cfg!(feature = "rustfft-backend") && !fft_size.is_power_of_two() makes it immediately clear that the power-of-two constraint applies only when not using the rustfft-backend.

Suggested change
if fft_size == 0 || !(cfg!(feature = "rustfft-backend") || fft_size.is_power_of_two()) {
if fft_size == 0 || !cfg!(feature = "rustfft-backend") && !fft_size.is_power_of_two() {

return Err(ConfigError::InvalidFftSize);
}
if hop_size == 0 || hop_size > fft_size {
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2 changes: 2 additions & 0 deletions tests/config_tests.rs
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Expand Up @@ -21,6 +21,7 @@ fn test_config_invalid_ola() {
assert!(config.is_err())
}

#[cfg(not(feature = "rustfft-backend"))]
#[test]
#[allow(deprecated)]
fn test_config_invalid_fft_size() {
Expand Down Expand Up @@ -89,6 +90,7 @@ fn test_builder_missing_hop_size() {
assert!(config.is_err());
}

#[cfg(not(feature = "rustfft-backend"))]
#[test]
fn test_builder_invalid_fft_size() {
let config = StftConfig::<f32>::builder()
Expand Down