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AIX Version 4.3 Assembler Language Reference

ld (Load Double Word) Instruction


Load a double-word of data into the specified general purpose register.


ld RT, D(RA)


The ld instruction loads a double-word in storage from a specified location in memory addressed by the effective address (EA) into the target general-purpose register (GPR) RT.

If GPR RA is not 0, the EA is the sum of the contents of GPR RA and D, a 16-bit, signed two's complement integer, fullword-aligned, sign-extended to 64 bits. If GPR RA is 0, then the EA is D.


RT Specifies target general-purpose register where result of operation is stored.
D Specifies a 16-bit, signed two's complement integer sign-extended to 32 bits for EA calculation.
RA Specifies source general-purpose register for EA calculation.


The following code loads a double-word from memory into GPR 4:

.extern  mydata[RW]
.csect   foodata[rw]
.local   foodata[rw]
storage: .llong mydata  # address of mydata

.csect   text[PR]
			# Assume GPR 5 contains address of csect foodata[RW].
ld       4,storage(5)	# GPR 5 now contains the address of mydata.


This instruction is defined only for 64-bit implementations. Using it on a 32-bit implementation will cause the system illegal instruction error handler to be invoked.

Related Information

Fixed-Point Processor.

Fixed-Point Load and Store Instructions.

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