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Differance between cust5 and cust1,2,...?
by rnd on Apr 29, 2013 |
rnd
Posts: 2 Joined: Apr 28, 2013 Last seen: May 15, 2013 |
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Why are the operands predefined for the cust5 instruction? How does it differ from the other custN instructions?
From the spec: --- [ cust5 ] --- opcode: 6 bits (0x3c) operand: 5 bits (D) operand: 5 bits (A) operand: 5 bits (B) operand: 6 bits (L) operand: 5 bits (K) Format: l.cust5 rD,rA,rB,L,K --- [ cust6 ] --- opcode: 6 bits (0x3d) reserved: 26 bits Format: l.cust6 |
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RE: Differance between cust5 and cust1,2,...?
by julius on Apr 30, 2013 |
julius
Posts: 363 Joined: Jul 1, 2008 Last seen: May 17, 2021 |
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My guess is that l.cust5 was arbitrarily proposed as one which had some predefined fields, as opposed to a single immediate.
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