MMIX Instruction Set
Content
Loading Signed Integers
Name:| LDB $X,$Y,$Z | LDB $X,$Y,Z | Load Byte/Load Byte Immediate |
| LDW $X,$Y,$Z | LDW $X,$Y,Z | Load Wyde/Load Wyde Immediate |
| LDT $X,$Y,$Z | LDT $X,$Y,Z | Load Tetra/Load Tetra Immediate |
| LDO $X,$Y,$Z | LDO $X,$Y,Z | Load Octa/Load Octa Immediate |
Specification:
With A ← $Y+$Z respectively A ← $Y+Z we have:
| LDB: s($X) | ← s(M1[A]) |
| LDW: s($X) | ← s(M2[A]) |
| LDT: s($X) | ← s(M4[A]) |
| LDO: s($X) | ← s(M8[A]) |
μ + υ
Description:
Loads one byte, wyde, tetrabyte, or octabyte. The target register $X is padded to the left using the sign bit.
The address A is rounded down, if necessary, according to the alignment requirements. Addresses for octabytes must be a multiple of 8, for tetrabytes a multiple of 4, and for wydes a multiple of 2. You may study the following visual examples to get a better understanding of how to Load Data.
| Register indirect adressing | Indexed addressing | Indexed addressing |
|---|---|---|
|  |  |
See also:
