IP-NIOS Altera, IP-NIOS Datasheet - Page 260

• Manufacturer Part Number: IP-NIOS
• Description: IP NIOS II MEGACORE
• Manufacturer: Altera
• Type: Licenser

Specifications of IP-NIOS

• Processor Type: RISC 32-Bit
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Features: -
• Package / Case: -
• Mounting Type: -
• Voltage: -
• Speed: -

8–74
mulxuu
Nios II Processor Reference Handbook
Operation:
Assembler Syntax:
Example:
Description:
Usage:
Exceptions:
Instruction Type:
Instruction Fields:
31
30
29
A
28
27
26
25
24
B
rC ← ((unsigned) rA) × ((unsigned) rB))
mulxuu rC, rA, rB
mulxuu r6, r7, r8
Treating rA and rB as unsigned integers, mulxuu multiplies rA times rB and stores the 32
high-order bits of the product to rC.
Nios II processors that do not implement the mulxuu instruction cause an unimplemented
instruction exception.
Use mulxuu and mul to compute the 64-bit product of two 32-bit unsigned integers.
Furthermore, mulxuu can be used as part of the calculation of a 128-bit product of two 64-bit
signed integers. Given two 64-bit signed integers, each contained in a pair of 32-bit registers,
(S1 : U1) and (S2 : U2), their 128-bit product is (U1 × U2) + ((S1 × U2) << 32) + ((U1 × S2) <<
32) + ((S1 × S2) << 64). The mulxuu and mul instructions are used to calculate the 64-bit
product U1 × U2.
mulxuu also can be used as part of the calculation of a 128-bit product of two 64-bit unsigned
integers. Given two 64-bit unsigned integers, each contained in a pair of 32-bit registers, (T1 :
U1) and (T2 : U2), their 128-bit product is (U1 × U2) + ((U1 × T2) << 32) + ((T1 × U2) << 32) +
((T1 × T2) << 64). The mulxuu and mul instructions are used to calculate the four 64-bit
products U1 × U2, U1 × T2, T1 × U2, and T1 × T2.
Unimplemented instruction
R
A = Register index of operand rA
B = Register index of operand rB
C = Register index of operand rC
23
22
21
20
19
C
18
17
16
15
14
0x07
63..32
13
multiply extended unsigned/unsigned
12
11
10
9
0
8
Chapter 8: Instruction Set Reference
December 2010 Altera Corporation
7
6
5
Instruction Set Reference
4
0x3a
3
2
1
0