| 摘要 |
<p>A method, system and computer program product for executing a signed displacement computer instruction.
In the preferred embodiment the existing pre-long displacement instruction formats for a non superscalar instruction form the operand storage address by the summing of the base register and 12 bit unsigned displacement or the base register, the index register, and the 12 bit unsigned displacement and the new long displacement instruction formats form the operand storage address by the summing of the base register and the 20 bit signed displacement or the base register, the index register, and the 20 bit signed displacement.
In accordance with the computer architecture of the preferred embodiment the displacement field is defined as being in two parts, the least significant part being 12 bits called the DL, DL1 for operand 1 or DL2 for operand 2, and the most significant part being 8 bits called the DH, DH1, for operand 1 or DH2 for operand 2.
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