Struct cranelift_codegen::isa::x64::encoding::rex::RexFlags

pub struct RexFlags(/* private fields */);

A small bit field to record a REX prefix specification:

• bit 0 set to 1 indicates REX.W must be 0 (cleared).
• bit 1 set to 1 indicates the REX prefix must always be emitted.

Implementations

impl RexFlags

pub fn set_w() -> Self

By default, set the W field, and don’t always emit.

pub fn clear_w() -> Self

Creates a new RexPrefix for which the REX.W bit will be cleared.

pub fn always_emit(&mut self) -> &mut Self

Require that the REX prefix is emitted.

pub fn always_emit_if_8bit_needed(&mut self, reg: Reg) -> &mut Self

Emit the rex prefix if the referenced register would require it for 8-bit operations.

pub fn must_clear_w(&self) -> bool

True if 64-bit operands are used.

pub fn must_always_emit(&self) -> bool

True if the REX prefix must always be emitted.

pub fn emit_one_op(&self, sink: &mut MachBuffer<Inst>, enc_e: u8)

Emit a unary instruction.

pub fn emit_two_op(&self, sink: &mut MachBuffer<Inst>, enc_g: u8, enc_e: u8)

Emit a binary instruction.

pub fn emit_three_op( &self, sink: &mut MachBuffer<Inst>, enc_g: u8, enc_index: u8, enc_base: u8 )

Emit a ternary instruction.

Trait Implementations

impl Clone for RexFlags

fn clone(&self) -> RexFlags

Returns a copy of the value.

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

Performs copy-assignment from source.

impl From<(OperandSize, Reg)> for RexFlags

Generate Rex flags for an OperandSize/register tuple.

fn from((size, reg): (OperandSize, Reg)) -> Self

Converts to this type from the input type.

impl From<OperandSize> for RexFlags

Generate the proper Rex flags for the given operand size.

fn from(size: OperandSize) -> Self

Converts to this type from the input type.

impl Copy for RexFlags