You copied the Doc URL to your clipboard.

Condition code suffixes

The instructions that can be conditional have an optional condition code, shown in syntax descriptions as {cond}. This condition is encoded in A32 instructions and in A64 instructions. The condition is encoded in a preceding IT instruction for T32 instructions. An instruction with a condition code is only executed if the condition flags meet the specified condition.

The following table shows the condition codes that you can use and the flags they depend on.

Table 15. Condition code suffixes
EQZ setEqual
NEZ clearNot equal
CS or HSC setHigher or same (unsigned >= )
CC or LOC clearLower (unsigned < )
MIN setNegative
PLN clearPositive or zero
VSV setOverflow
VCV clearNo overflow
HIC set and Z clearHigher (unsigned >)
LSC clear or Z setLower or same (unsigned <=)
GEN and V the sameSigned >=
LTN and V differSigned <
GTZ clear, N and V the sameSigned >
LEZ set, N and V differSigned <=
ALAnyAlways. This suffix is normally omitted.

The following example shows conditional execution in A32 code.

    ADD     r0, r1, r2    ; r0 = r1 + r2, don't update flags
    ADDS    r0, r1, r2    ; r0 = r1 + r2, and update flags
    ADDSCS  r0, r1, r2    ; If C flag set then r0 = r1 + r2, and update flags
    CMP     r0, r1        ; update flags based on r0-r1.

Was this page helpful? Yes No