SH7713 datasheet(123/904 Pages) RENESAS

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Section 3 DSP Operating Unit

Rev.1.50 Aug. 30, 2006 Page 83 of 860

REJ09B0288-0150

Table 3.5

Repeat Control Macros

Instruction

Operation

Number of

Execution

States

REPEAT RptStart, RptEnd, #imm Specifies RptStart as repeat start instruction,

RptEnd as repeat end instruction, and 8-bit

immediate data #imm as number of repetitions.

This macro is extended to three instructions:

LDRS, LDRE, and SETRC which are converted

correctly.

REPEAT RptStart, RptEnd, Rm

Specifies RptStart as repeat start instruction,

RptEnd as repeat end instruction, and the [11:0]

bits of Rm as number of repetitions. This macro

is extended to three instructions: LDRS, LDRE,

and SETRC which are converted correctly.

Using the repeat macros shown in table 3.5, examples 1 to 4 shown above can be simplified to

examples 5 to 8 as shown below.

• Example 5: Repeat loop consisting of 4 or more instructions (extended to the instruction

stream shown in example 1, above)

REPEAT RptStart, RptEnd, #4

Instr0

;

RptStart: instr1

; [Repeat start instruction]

... ...

;

... ...

;

instr(N-3)

;

instr(N-2)

;

instr(N-1)

;

RptEnd:

instrN

;[Repeat end instruction]

• Example 6: Repeat loop consisting of three instructions (extended to the instruction stream

shown in example 2, above)

REPEAT RptStart, RptEnd, #4

instr0

;

RptStart: instr1

; [Repeat start instruction]

Instr2

;

RptEnd:

instr3

; [Repeat end instruction]

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