1 files changed, 97 insertions, 0 deletions
diff --git a/yjit/src/asm/arm64/inst/logical_imm.rs b/yjit/src/asm/arm64/inst/logical_imm.rs
new file mode 100644
index 0000000000..63a4556d85
--- /dev/null
+++ b/yjit/src/asm/arm64/inst/logical_imm.rs
@@ -0,0 +1,97 @@
+use super::bitmask_imm::BitmaskImmediate;
+use super::sf::Sf;
+
+// Which operation to perform.
+enum Opc {
+    /// The AND operation.
+    And = 0b00,
+
+    /// The ANDS operation.
+    Ands = 0b11
+}
+
+/// The struct that represents an A64 bitwise immediate instruction that can be
+/// encoded.
+///
+/// AND/ANDS (immediate)
+/// +-------------+-------------+-------------+-------------+-------------+-------------+-------------+-------------+
+/// | 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    0  0  1  0    0                                                                                |
+/// | sf opc..                       N  immr...............   imms............... rn.............. rd.............. |
+/// +-------------+-------------+-------------+-------------+-------------+-------------+-------------+-------------+
+///
+pub struct LogicalImm {
+    /// The register number of the destination register.
+    rd: u8,
+
+    /// The register number of the first operand register.
+    rn: u8,
+
+    /// The immediate value to test.
+    imm: BitmaskImmediate,
+
+    /// The opcode for this instruction.
+    opc: Opc,
+
+    /// Whether or not this instruction is operating on 64-bit operands.
+    sf: Sf
+}
+
+impl LogicalImm {
+    /// AND (immediate)
+    /// https://developer.arm.com/documentation/ddi0596/2021-12/Base-Instructions/AND--immediate---Bitwise-AND--immediate--?lang=en
+    pub fn and(rd: u8, rn: u8, imm: BitmaskImmediate, num_bits: u8) -> Self {
+        Self { rd, rn, imm, opc: Opc::And, sf: num_bits.into() }
+    }
+
+    /// ANDS (immediate)
+    /// https://developer.arm.com/documentation/ddi0596/2021-12/Base-Instructions/ANDS--immediate---Bitwise-AND--immediate---setting-flags-?lang=en
+    pub fn ands(rd: u8, rn: u8, imm: BitmaskImmediate, num_bits: u8) -> Self {
+        Self { rd, rn, imm, opc: Opc::Ands, sf: num_bits.into() }
+    }
+}
+
+/// https://developer.arm.com/documentation/ddi0602/2022-03/Index-by-Encoding/Data-Processing----Immediate?lang=en#log_imm
+const FAMILY: u32 = 0b1001;
+
+impl From<LogicalImm> for u32 {
+    /// Convert an instruction into a 32-bit value.
+    fn from(inst: LogicalImm) -> Self {
+        let imm: u32 = inst.imm.into();
+
+        0
+        | ((inst.sf as u32) << 31)
+        | ((inst.opc as u32) << 29)
+        | (FAMILY << 25)
+        | (imm << 10)
+        | ((inst.rn as u32) << 5)
+        | inst.rd as u32
+    }
+}
+
+impl From<LogicalImm> for [u8; 4] {
+    /// Convert an instruction into a 4 byte array.
+    fn from(inst: LogicalImm) -> [u8; 4] {
+        let result: u32 = inst.into();
+        result.to_le_bytes()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_and() {
+        let inst = LogicalImm::and(0, 1, 7.try_into().unwrap(), 64);
+        let result: u32 = inst.into();
+        assert_eq!(0x92400820, result);
+    }
+
+    #[test]
+    fn test_ands() {
+        let inst = LogicalImm::ands(0, 1, 7.try_into().unwrap(), 64);
+        let result: u32 = inst.into();
+        assert_eq!(0xf2400820, result);
+    }
+}