Enum Length

pub enum Length {
    L128,
    L256,
    L512,
    LZ,
    LIG,
}

Contains vector length definitions.

VEX encodes these in the L bit field, a single bit with 128-bit = 0 and 256-bit = 1. For convenience, we also include the LIG and LZ syntax, used by the reference manual, and always set these to 0.

EVEX encodes this in the L'L bits, two bits that typically indicate the vector length for packed vector instructions but can also be used for rounding control for floating-point instructions with rounding semantics (see section 2.7.1 in the reference manual).

Variants

L128

128-bit vector length.

L256

256-bit vector length.

L512

512-bit vector length; invalid for VEX instructions.

LZ

Force the length bits to 0, but not necessarily for 128-bit operation. From the reference manual: “The VEX.L must be encoded to be 0B, an #UD occurs if VEX.L is not zero.”

LIG

The length bits are ignored (e.g., for floating point scalar instructions). This assembler will emit 0.

Implementations

impl Length

pub fn vex_bits(&self) -> u8

Encode the VEX.L bit.

pub fn evex_bits(&self) -> u8

Encode the EVEX.L'L bits.

See section 2.7.10, Vector Length Orthogonality, in the reference manual

Trait Implementations

impl Display for Length

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

Formats the value using the given formatter.