def execute_cmp(s, inst):
if condition_passed(s, inst.cond):
a, (b, _) = s.rf[inst.rn], shifter_operand(s, inst)
result = intmask(a - b)
s.N = (result >> 31) & 1
s.Z = trim_32(result) == 0
s.C = not_borrow_from(result)
s.V = overflow_from_sub(a, b, result)
if inst.rd == 15:
return
s.rf[PC] = s.fetch_pc() + 4
def execute_sbc(s, inst):
if condition_passed(s, inst.cond):
a, (b, _) = s.rf[inst.rn], shifter_operand(s, inst)
result = intmask(a - b - (not s.C))
s.rf[inst.rd] = trim_32(result)
if inst.S:
if inst.rd == 15: raise FatalError('Writing SPSR not implemented!')
s.N = (result >> 31) & 1
s.Z = trim_32(result) == 0
s.C = not_borrow_from(result)
s.V = overflow_from_sub(a, b, result)
if inst.rd == 15:
return
s.rf[PC] = s.fetch_pc() + 4