Enum cranelift_codegen::isa::ConstraintKind [−][src]
Expand description
The different kinds of operand constraints.
Variants
This operand or result must be a register from the given register class.
This operand or result must be a fixed register.
The constraint’s regclass
field is the top-level register class containing the fixed
register.
Tuple Fields of FixedReg
0: RegUnit
This result value must use the same register as an input value operand.
The associated number is the index of the input value operand this result is tied to. The
constraint’s regclass
field is the same as the tied operand’s register class.
When an (in, out) operand pair is tied, this constraint kind appears in both the ins
and
the outs
arrays. The constraint for the in operand is Tied(out)
, and the constraint for
the out operand is Tied(in)
.
Tuple Fields of Tied
0: u8
This operand must be a fixed register, and it has a tied counterpart.
This works just like FixedReg
, but additionally indicates that there are identical
input/output operands for this fixed register. For an input operand, this means that the
value will be clobbered by the instruction
Tuple Fields of FixedTied
0: RegUnit
This operand must be a value in a stack slot.
The constraint’s regclass
field is the register class that would normally be used to load
and store values of this type.
Trait Implementations
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
This method tests for !=
.
Auto Trait Implementations
impl RefUnwindSafe for ConstraintKind
impl Send for ConstraintKind
impl Sync for ConstraintKind
impl Unpin for ConstraintKind
impl UnwindSafe for ConstraintKind
Blanket Implementations
Mutably borrows from an owned value. Read more
Compare self to key
and return true
if they are equal.