SH7721 datasheet(199/1524 Pages) RENESAS

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Section 3 DSP Operating Unit

Rev. 3.00 Jan. 18, 2008 Page 137 of 1458

REJ09B0033-0300

3.5.8

Shift Operations

Shift operations can use either register or immediate value as the shift amount operand. Other

source and destination operands are specified by the register. There are two kinds of shift

operations of arithmetic and logical shifts. Table 3.27 shows the variation of this type of operation.

The correspondence between each operand and registers, except for immediate operands, is the

same as the ALU fixed-point operations as shown in table 3.21.

Table 3.27

Variation of Shift Operations

Mnemonic

Function

Source 1

Source 2

Destination

PSHA Sx, Sy, Dz

Arithmetic shift

PSHL Sx, Sy, Dz

Logical shift

PSHA #Imm1, Dz Arithmetic shift with

immediate.

Imm1

PSHL #Imm2, Dz

Logical shift with

immediate.

Imm2

–32 <= Imm1 <= +32, –16 <= Imm2 <= +16

(1)

Arithmetic Shift

Figure 3.17 shows the arithmetic shift operation flow.

DSR

Updated

32 31

16 15

32 31

16 15

Shift out

(MSB copy)

Ignored

Left shift

Right shift

32 31

23 22

Imm1

Shift amount data

(source 2)

>=0

+32 to -32

Figure 3.17 Arithmetic Shift Operation Flow

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