Re: Multiply Overflow - when to use UMULH

Uncle George (gatgul@voicenet.com)
Sun, 24 Nov 1996 20:24:18 -0500

Richard Henderson wrote:
>
> > From reading the asm manual, you have to wait for the pipeline to
> > clear, cause an exception, then get the status/overflow bit.
>
> Eh? There is no overflow bit. There is is no PSW to put one in.
> Thus doing umul and umulh sequentially is your only option.
>
FROM pg 4-30 Common architecture (i)
4.4.8 Quadword Multiply

MULQ

Exceptions:
Integer Overflow.

Qualifiers:
Integer Overflow Enable /V

so says my alpha architecture manual

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