UM0438 datasheet(37/50 Pages) STMICROELECTRONICS

37 / 50 page

UM0438

Simplified mnemonics for VLE instructions

37/50

As with branch mnemonics, the crD field of a compare instruction can be omitted if CR0 is

used, as shown in examples 1 nd 3 below. Otherwise, the target CR field must be specified

as the first operand. The following examples use word compare mnemonics:

Compare rA with immediate value 100 as signed 32-bit integers and place result in

CR0.

e_cmpwi rA,100

equivalent to

e_cmp16i rA,100

Same as (1), but place results in CR4.

e_cmpwi cr3,rA,100

equivalent to

e_cmpi 3,rA,100

Compare rA and rB as unsigned 32-bit integers and place result in CR0.

cmplw rA,rB

equivalent to

cmpl 0,0,rA,rB

A.7

Trap instructions simplified mnemonics

The codes in Table 28 are for the most common combinations of trap conditions.

The mnemonics in Table 29 are variations of trap instructions, with the most useful TO

values represented in the mnemonic rather than specified as a numeric operand.

Table 28.

Standard codes for trap instructions

Code

Description

TO Encoding

<U(1)

The symbol ‘<U’ indicates an unsigned less-than evaluation is performed.

>U(2)

The symbol ‘>U’ indicates an unsigned greater-than evaluation is performed.

Less than

0000

Less than or equal

0100

Equal

0100

Greater than or equal

1100

Greater than

1000

Not less than

1100

Not equal

1000

Not greater than

0100

llt

Logically less than

0010

lle

Logically less than or equal

0110

lge

Logically greater than or equal

0101

lgt

Logically greater than

0001

lnl

Logically not less than

0101

lng

Logically not greater than

0110

—

Unconditional

1111

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