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Instruction Descriptions 4–59
For software that is not designed to use the BWX extension, the intended sequence for storing
an unaligned word R5 at X is:
LDA R6, X(R11) ; R6<2:0> = (X mod 8) = 5
LDQ_U R2, X+1(R11) ; Ignores va<2:0>, R2 = yBAx xxxx
LDQ_U R1, X(R11) ; Ignores va<2:0>, R1 = yBAx xxxx
INSWH R5, R6, R4 ; R4 = 0000 0000
INSWL R5, R6, R3 ; R3 = 0BA0 0000
MSKWH R2, R6, R2 ; R2 = yBAx xxxx
MSKWL R1, R6, R1 ; R1 = y00x xxxx
OR R2, R4, R2 ; R2 = yBAx xxxx
OR R1, R3, R1 ; R1 = yBAx xxxx
STQ_U R2, X+1(R11) ; Must store high then low for
STQ_U R1, X(R11) ; degenerate case of aligned
For software that is not designed to use the BWX extension, the intended sequence for storing
a byte R5 at X is:
LDA R6, X(R11) ; R6<2:0> = (X mod 8) = 5
LDQ_U R1, X(R11) ; Ignores va<2:0>, R1 = yyAx xxxx
INSBL R5, R6, R3 ; R3 = 00A0 0000
MSKBL R1, R6, R1 ; R1 = yy0x xxxx
OR R1, R3, R1 ; R1 = yyAx xxxx
STQ_U R1, X(R11) ;