Excalibur electronic A-MNL-NIOSPROG-01.1 用户手册

Altera Corporation

32323232

32-Bit Instruction Set

-B

it In
st

ctio
n

Se
t

SKPS

Skip On Condition Code

Operation:

if (condition IMM4 is true)
then begin

if (Mem16[PC + 2] is PFX)
then PC

← PC + 6

else PC

← PC + 4

end

Assembler Syntax:

SKPS cc_IMM4

Example:

SKPS cc_ne

BSR SendIt ; only call if Z flag clear

NOP ; (delay slot) executed in either case

Description:

Skip next instruction if specified condition is true. If the next instruction is PFX,
then both PFX and the instruction following PFX are skipped together.

Condition Codes:

Settings:

These condition
codes have
different numeric
values for IFS and
SKPS instructions.

cc_c

0x0

(C)

cc_nc

0x1

(not C)

cc_z

0x2

(Z)

cc_nz

0x3

(not Z)

cc_mi

0x4

(N)

cc_pl

0x5

(not N)

cc_ge

0x6

(not (N xor V))

cc_lt

0x7

(N xor V)

cc_le

0x8

(Z or (N xor V))

cc_gt

0x9

(Not (Z or (N xorV)))

cc_v

0xa

(V)

cc_nv

0xb

(not V)

cc_la

0xc

(C or Z)

cc_hi

0xd

(not (C or Z))

Additional alias flags allowed:

cc_cs = cc_c
cc_eq = cc_z

cc_n = cc_mi
cc_vs = cc_v

cc_cc = cc_nc
cc_ne = cc_nz

cc_vc = cc_nv
cc_p = cc_pl

Codes mean skip if, e.g., skps cc_eq means skip if equal

Instruction Format:

i4w

Instruction Fields:

IMM4 = 4-bit immediate value

IMM4