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Altera Corporation 89
3232323232-Bit Instruction Set
2
32-Bit Instruction
Set
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:
1 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
1514131211109876543210
011111101110 IMM4