Format: label EQU expression
gives label the value of the expression
every occurrence of label will be treated as if it was the expression
R0 EQU 0 R1 EQU 1 ... R15 EQU 15
Then R# can be used whenever a register number is needed.
L 3,NUM1 can be replaced with L R3,NUM1
intended to make the coding of branch instructions easier by eliminating the need to explicitly specify a mask
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Extended Mnemonic |
Meaning |
Replaces |
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RX version |
RR version |
RX version |
RR version |
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BH D(X,B) |
BHR R |
Branch on HIGH |
BC B‘0010’,D(X,B) |
BCR B‘0010’,R |
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BL D(X,B) |
BLR R |
Branch on LOW |
BC B‘0100’,D(X,B) |
BCR B‘0100’,R |
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BE D(X,B) |
BER R |
Branch on EQUAL |
BC B‘1000’,D(X,B) |
BCR B‘1000’,R |
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BNH D(X,B) |
BNHR R |
Branch on NOT HIGH |
BC B‘1101’,D(X,B) |
BCR B‘1101’,R |
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BNL D(X,B) |
BNLR R |
Branch on NOT LOW |
BC B‘1011’,D(X,B) |
BCR B‘1011’,R |
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BNE D(X,B) |
BNER R |
Branch on NOT EQUAL |
BC B‘0111’,D(X,B) |
BCR B‘0111’,R |
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After ARITHMETIC instructions:
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Extended Mnemonic |
Meaning |
Replaces |
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RX version |
RR version |
RX version |
RR version |
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BP D(X,B) |
BPR R |
Branch on PLUS |
BC B‘0010’,D(X,B) |
BCR B‘0010’,R |
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BM D(X,B) |
BMR R |
Branch on MINUS |
BC B‘0100’,D(X,B) |
BCR B‘0100’,R |
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BZ D(X,B) |
BZR R |
Branch on ZERO |
BC B‘1000’,D(X,B) |
BCR B‘1000’,R |
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BO D(X,B) |
BOR R |
Branch on OVERFLOW |
BC B‘0001’,D(X,B) |
BCR B‘0001’,R |
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BNP D(X,B) |
BNPR R |
Branch on NOT PLUS |
BC B‘1101’,D(X,B) |
BCR B‘1101’,R |
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BNM D(X,B) |
BNMR R |
Branch on NOT MINUS |
BC B‘1011’,D(X,B) |
BCR B‘1011’,R |
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BNZ D(X,B) |
BNZR R |
Branch on NOT ZERO |
BC B‘0111’,D(X,B) |
BCR B‘0111’,R |
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BNO D(X,B) |
BNOR R |
Branch on NOT OVERFLOW |
BC B‘1110’,D(X,B) |
BCR B‘1110’,R |
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