Subtract pointer
This instruction subtracts the 56-bit address held in the second source register from the 56-bit address held in the first source register, sign-extends the result to 64 bits, and writes the result to the destination register.
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | Rm | 0 | 0 | 0 | 0 | 0 | 0 | Rn | Rd | ||||||||||||
| sf | S | opcode | |||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_MTE) then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm);
| <Xd> |
Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field. |
| <Xn|SP> |
Is the 64-bit name of the first source general-purpose register or stack pointer, encoded in the "Rn" field. |
| <Xm|SP> |
Is the 64-bit name of the second general-purpose source register or stack pointer, encoded in the "Rm" field. |
var operand1 : bits(64) = if n == 31 then SP{64}() else X{64}(n); var operand2 : bits(64) = if m == 31 then SP{64}() else X{64}(m); operand1 = SignExtend{64}(operand1[55:0]); operand2 = NOT(SignExtend{64}(operand2[55:0])); var result : bits(64); (result, -) = AddWithCarry{64}(operand1, operand2, '1'); X{64}(d) = result;
2026-03_rel 2026-03-26 20:48:11
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