Re: Parameter passing: overly cautious or properly paranoid?

[Gerhard Postpischil]

On 8/13/2010 3:17 AM, Martin Trübner wrote:

is absolutly identical to
    LT  R15,PARM4
    BP  NICE_PARM
    BM  LAST_PARM

The detection of an empty parm has to be done anyway.

There are four possibilities, so an additional test is required,
which is all I pointed out. The instructions used are irrelevant
to that. X'80000000' under normal conditions is pathological -
it's not the zero expected for an end of parameter list, and
it's not a valid last parameter address.

Gerhard Postpischil
Bradford, VT