Enum cranelift_codegen::isa::x64::encoding::evex::EvexContext

pub enum EvexContext {
    RoundingRegToRegFP {
        rc: EvexRoundingControl,
    },
    NoRoundingFP {
        sae: bool,
        length: EvexVectorLength,
    },
    MemoryOp {
        broadcast: bool,
        length: EvexVectorLength,
    },
    Other {
        length: EvexVectorLength,
    },
}

Defines the EVEX context for the L', L, and b bits (bits 6:4 of EVEX P2 byte). Table 2-36 in section 2.6.10 (Intel Software Development Manual, volume 2A) describes how these bits can be used together for certain classes of instructions; i.e., special care should be taken to ensure that instructions use an applicable correct EvexContext. Table 2-39 contains cases where opcodes can result in an #UD.

Variants

RoundingRegToRegFP

Fields of RoundingRegToRegFP

rc: EvexRoundingControl

NoRoundingFP

Fields of NoRoundingFP

sae: boollength: EvexVectorLength

MemoryOp

Fields of MemoryOp

broadcast: boollength: EvexVectorLength

Other

Fields of Other

length: EvexVectorLength

Implementations

impl EvexContext

pub fn bits(&self) -> u8

Encode the L', L, and b bits (bits 6:4 of EVEX P2 byte) for merging with the P2 byte.

Trait Implementations

impl Default for EvexContext

fn default() -> Self

Returns the “default value” for a type.