s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 107
s3c2410a
Manufacturer Part Number
s3c2410a
Description
16/32-bit Risc Arm Microprocessor
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C2410A.pdf
(599 pages)
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S3C2410A
MULTIPLY LONG AND MULTIPLY-ACCUMULATE LONG (MULL, MLAL)
The instruction is only executed if the condition is true. The various conditions are defined in Table 3-2. The
instruction encoding is shown in Figure 3-13.
The multiply long instructions perform integer multiplication on two 32-bit operands and produce 64-bit results.
Signed and unsigned multiplication each with optional accumulate give rise to four variations.
The multiply forms (UMULL and SMULL) take two 32-bit numbers and multiply them to produce a 64-bit result of the
form RdHi,RdLo := Rm * Rs. The lower 32 bits of the 64-bit result are written to RdLo, the upper 32 bits of the result
are written to RdHi.
The multiply-accumulate forms (UMLAL and SMLAL) take two 32-bit numbers, multiply them and add a 64 bit
number to produce a 64-bit result of the form RdHi,RdLo := Rm * Rs + RdHi,RdLo. The lower 32 bits of the 64-bit
number to add is read from RdLo. The upper 32 bits of the 64 bit number to add is read from RdHi. The lower 32 bits
of the 64-bit result are written to RdLo. The upper 32 bits of the 64 bit result are written to RdHi.
The UMULL and UMLAL instructions treat all of their operands as unsigned binary numbers and write an unsigned 64
bit result. The SMULL and SMLAL instructions treat all of their operands as two's-complement signed numbers and
write a two's-complement signed 64-bit result.
31
Cond
28
27
0
0
0 0 1
23
[11:8][3:0] Operand Registers
[19:16][15:12] Source Destination Registers
[20] Set Condition Code
0 = Do not alter condition codes
1 = Set condition codes
[21] Accumulate
0 = Multiply only
1 = Multiply and accumulate
[22] Unsigned
0 = Unsigned
1 = Signed
[31:28] Condition Field
22
U
Figure 3-13. Multiply Long Instructions
21
A
20
S
19
RdHi
16
15
RdLo
12
11
Rs
8 7
1 0 0 1
4 3
ARM INSTRUCTION SET
Rm
0
3-25
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