diff options
Diffstat (limited to 'yjit/src/asm/arm64/inst/nop.rs')
-rw-r--r-- | yjit/src/asm/arm64/inst/nop.rs | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/yjit/src/asm/arm64/inst/nop.rs b/yjit/src/asm/arm64/inst/nop.rs new file mode 100644 index 0000000000..d58b3574a9 --- /dev/null +++ b/yjit/src/asm/arm64/inst/nop.rs @@ -0,0 +1,44 @@ +/// The struct that represents an A64 nop instruction that can be encoded. +/// +/// NOP +/// +-------------+-------------+-------------+-------------+-------------+-------------+-------------+-------------+ +/// | 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 0 1 0 0 0 0 0 0 1 1 0 0 1 0 0 0 0 0 0 0 0 1 1 1 1 1 | +/// +-------------+-------------+-------------+-------------+-------------+-------------+-------------+-------------+ +/// +pub struct Nop; + +impl Nop { + /// NOP + /// https://developer.arm.com/documentation/ddi0602/2022-03/Base-Instructions/NOP--No-Operation- + pub fn nop() -> Self { + Self {} + } +} + +impl From<Nop> for u32 { + /// Convert an instruction into a 32-bit value. + fn from(_inst: Nop) -> Self { + 0b11010101000000110010000000011111 + } +} + +impl From<Nop> for [u8; 4] { + /// Convert an instruction into a 4 byte array. + fn from(inst: Nop) -> [u8; 4] { + let result: u32 = inst.into(); + result.to_le_bytes() + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_nop() { + let inst = Nop::nop(); + let result: u32 = inst.into(); + assert_eq!(0xd503201f, result); + } +} |