Enum W4a4Downcast 

pub enum W4a4Downcast {
    Off,
    Narrow,
    Wide,
}

2026-09-28: --w4a4-downcast and --w4a4-downcast-wide, which exist only under the nvfp4 tier. They run every NVFP4 small-M projection’s activations as NVFP4 (W4A4), whatever the checkpoint declares.

Variants

Off

2026-09-28: 16-bit activations at decode.

Narrow

2026-09-28: --w4a4-downcast: up to 32 rows.

Wide

2026-09-28: --w4a4-downcast --w4a4-downcast-wide: up to 64 rows.

Implementations

impl W4a4Downcast

pub fn from_flags(downcast: bool, wide: bool) -> Self

2026-09-28: From the two presence flags; -wide alone does nothing, as it always has.

Trait Implementations

impl Clone for W4a4Downcast

fn clone(&self) -> W4a4Downcast

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for W4a4Downcast

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for W4a4Downcast

fn default() -> W4a4Downcast

Returns the “default value” for a type.

impl PartialEq for W4a4Downcast

fn eq(&self, other: &W4a4Downcast) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for W4a4Downcast

impl Eq for W4a4Downcast

impl StructuralPartialEq for W4a4Downcast