Arm VERSION 1.2 Manual de usuario descargar pdf (Pagina 33)

100

101

Writing ARM and Thumb Assembly Language

2.5.2 Execution conditions

The relation of condition code suffixes to the

and

flags is shown in Table 2-1.

Examples

ADD r0, r1, r2 ; r0 = r1 + r2, don't update flags

ADDS r0, r1, r2 ; r0 = r1 + r2, and update flags

ADDCSS r0, r1, r2 ; If C flag set then r0 = r1 + r2, and update flags

CMP r0, r1 ; update flags based on r0-r1.

Table 2-1 Condition code suffixes

Suffix Flags Meaning

EQ Z

set Equal

NE Z

clear Not equal

CS/HS C

set Higher or same (unsigned >= )

CC/LO C

clear Lower (unsigned < )

MI N

set Negative

PL N

clear Positive or zero

VS V

set Overflow

VC V

clear No overflow

HI C

set and

clear Higher (unsigned > )

LS C

clear or

set Lower or same (unsigned <= )

GE N

and

the same Signed >=

LT N

and

differ Signed <

GT Z

clear,

and

the same Signed >

LE Z

set,

and

differ Signed <=

Any Always. This suffix is normally omitted.

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Arm VERSION 1.2 Manual de usuario Pagina 33

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