diff options
Diffstat (limited to 'yjit/src/asm/arm64/inst/branches_and_system.rs')
-rw-r--r-- | yjit/src/asm/arm64/inst/branches_and_system.rs | 62 |
1 files changed, 0 insertions, 62 deletions
diff --git a/yjit/src/asm/arm64/inst/branches_and_system.rs b/yjit/src/asm/arm64/inst/branches_and_system.rs deleted file mode 100644 index 77e99c112a..0000000000 --- a/yjit/src/asm/arm64/inst/branches_and_system.rs +++ /dev/null @@ -1,62 +0,0 @@ -use super::family::Family; - -/// The struct that represents an A64 branches and system instruction that can -/// be encoded. -/// -/// RET -/// +-------------+-------------+-------------+-------------+-------------+-------------+-------------+-------------+ -/// | 31 30 29 28 | 27 26 25 24 | 23 22 21 20 | 19 18 17 16 | 15 14 13 12 | 11 10 09 08 | 07 06 05 04 | 03 02 01 00 | -/// | 1 1 0 1 0 1 1 0 0 1 0 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 | -/// | rn.............. rm.............. | -/// +-------------+-------------+-------------+-------------+-------------+-------------+-------------+-------------+ -/// -pub struct BranchesAndSystem { - /// The register holding the address to be branched to. - rn: u8 -} - -impl BranchesAndSystem { - /// RET - /// https://developer.arm.com/documentation/ddi0596/2021-12/Base-Instructions/RET--Return-from-subroutine-?lang=en - pub fn ret(rn: u8) -> Self { - Self { rn } - } -} - -impl From<BranchesAndSystem> for u32 { - /// Convert an instruction into a 32-bit value. - fn from(inst: BranchesAndSystem) -> Self { - 0 - | (0b11 << 30) - | ((Family::BranchesAndSystem as u32) << 25) - | (0b1001011111 << 16) - | ((inst.rn as u32) << 5) - } -} - -impl From<BranchesAndSystem> for [u8; 4] { - /// Convert an instruction into a 4 byte array. - fn from(inst: BranchesAndSystem) -> [u8; 4] { - let result: u32 = inst.into(); - result.to_le_bytes() - } -} - -#[cfg(test)] -mod tests { - use super::*; - - #[test] - fn test_ret() { - let inst = BranchesAndSystem::ret(30); - let result: u32 = inst.into(); - assert_eq!(0xd65f03C0, result); - } - - #[test] - fn test_ret_rn() { - let inst = BranchesAndSystem::ret(20); - let result: u32 = inst.into(); - assert_eq!(0xd65f0280, result); - } -} |