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UM0438

Simplified mnemonics for VLE instructions

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A.10

EIS-Specific simplified mnemonics

This section describes simplified mnemonics used by auxiliary processing units (APUs)

defined as part of the Book E implementation standards (EIS).

A.10.1

Integer Select (isel)

The following mnemonics simplify the most common variants of the isel instruction that

access CR0:

Integer Select Less Than

isellt rD,rA,rB

equivalent to

isel rD,rA,rB,0

Integer Select Greater Than

iselgt rD,rA,rB

equivalent to

isel rD,rA,rB,1

Integer Select Equal

iseleq rD,rA,rB

equivalent to

isel rD,rA,rB,2

A.11

Comprehensive list of simplified mnemonics

Table 32 lists simplified mnemonics. Note that compiler designers may implement additional

simplified mnemonics not listed here.

Table 32.

Simplified mnemonics

Simplified mnemonic

Mnemonic

Instruction

e_bdnz target(1)

e_bc 2,0,target

Decrement CTR, branch if CTR

≠ 0 (e_bc without

LR update)

e_bdnzl target 1

e_bcl 2,0,target

Decrement CTR, branch if CTR

≠ 0 (e_bcl with LR

update)

e_bdz target 1

e_bc 3,0,target

Decrement CTR, branch if CTR = 0 (e_bc without

LR update)

e_bdzl target 1

e_bcl 3,BI32,target

Decrement CTR, branch if CTR = 0 (e_bcl with LR

update)

e_beq crS,target

e_bc 1,BI32(2),target

Branch if equal (e_bc without LR updating)

se_beq target

se_bc 1,BI162,target

Branch if equal (se_bc)

e_beql crS,target

e_bcl 1,BI32 2,target

Branch if equal (e_bcl with LR updating)

e_bf BI32,target

e_bc 0,BI32,target

Branch if condition false (3) (e_bc without LR

update)

se_bf BI16,target

se_bc 0,BI16,target

Branch if condition false3 (se_bc)

e_bfl BI32,target

e_bcl 0,BI32,target

Branch if condition false 3 (e_bcl with LR update)

e_bge crS,target

e_bc 0,BI32(4),target

Branch if greater than or equal (e_bc without LR

updating)

se_bge target

se_bc 0,BI164,target

Branch if greater than or equal (se_bc)

e_bgel crS,target

e_bcl 0,BI324,target

Branch if greater than or equal (e_bcl with LR

updating)

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