The Exclusive Or instruction performs a logical bit by bit “exclusive or” between a register and a fullword in memory. Operand 1, the target, is a register and Operand 2, the source, specifies a fullword in memory. The fullword in memory is exclusive or-ed internally with the fullword in the register and the result is placed in the register. The fullword in memory is not changed. The table below shows the results of “exclusive or-ing” two bits together.

Bit 1 Bit 2 Result

0 0 0

0 1 1

1 0 1

1 1 0

This instruction sets the condition code as follows:

0 if all target bits are set to 0. Test this condition with BZ or BNZ.

1 if any target bit is set to 1. Test this condition with BM or BNM.

Some Unrelated Exclusive Ors

R4 = X’FFFFFFFF’ ALL 1’S

R5 = X’00000000’ ALL 0’S

R6 = X’0000148C’ 00000000000000000001010010001100

FIELD1 DC X’0000148C’

FIELD2 DC X’00000000’

FIELD3 DC X’FFFFFFFF’

FIELD4 DC X’12345678’

X R4,FIELD1 R4 = X’FFFFEB73’ Condition Code = 1

X R4,FIELD2 R4 = X’FFFFFFFF’ Condition Code = 1

X R4,FIELD3 R4 = X’00000000’ Condition Code = 0

X R4,FIELD4 R4 = X’EDCBA987’ Condition Code = 1

X R5,FIELD1 R5 = X’0000148C’ Condition Code = 1

X R5,FIELD2 R5 = X’00000000’ Condition Code = 0

X R5,FIELD3 R5 = X’FFFFFFFF’ Condition Code = 1

X R5,FIELD4 R5 = X’12345678’ Condition Code = 1

X R6,FIELD1 R6 = X’00000000’ Condition Code = 0

X R6,FIELD2 R6 = X’0000148C’ Condition Code = 1

X R6,FIELD3 R6 = X’FFFFEB73’ Condition Code = 1

X R6,FIELD4 R6 = X’123442F4’ Condition Code = 1