pub struct BranchRange {
pub origin: u8,
pub bits: u8,
}
Constraints on the range of a branch instruction.
A branch instruction usually encodes its destination as a signed n-bit offset from an origin.
The origin depends on the ISA and the specific instruction:
- RISC-V and ARM Aarch64 use the address of the branch instruction,
origin = 0
.
- x86 uses the address of the instruction following the branch,
origin = 2
for a 2-byte
branch instruction.
- ARM's A32 encoding uses the address of the branch instruction + 8 bytes,
origin = 8
.
Offset in bytes from the address of the branch instruction to the origin used for computing
the branch displacement. This is the destination of a branch that encodes a 0 displacement.
Number of bits in the signed byte displacement encoded in the instruction. This does not
account for branches that can only target aligned addresses.
Determine if this branch range can represent the range from branch
to dest
, where
branch
is the code offset of the branch instruction itself and dest
is the code offset
of the destination EBB header.
This method does not detect if the range is larger than 2 GB.
Performs copy-assignment from source
. Read more
Formats the value using the given formatter. Read more