Normally, the hw that does an integer div or mul is very different the hw
executes the fp version. Float mult/div should probably be handled by a
different unit.
Ali
Sent from my ARM powered device
On May 27, 2011, at 7:09 AM, Maximilien Breughe
<maximilien.breu...@elis.ugent.be> wrote:
> Hello,
>
> I am using M5's inorder model (in ALPHA_SE mode).
> I found out that the InOrderCPU::createBackEndSked only makes schedules for
> the MultDivUnit IF the instruction is an Integer multiplication/division. It
> doesn't do this for floating point mul/divs. Is there a special purpose for
> this?
>
> Changing it to allow for fp mul/div only involves changing the following
> lines:
> in cpu/inorder/cpu.cc in the function InOrderCPU::createBackEndSked:
> ---else if (inst->opClass() == IntMultOp || inst->opClass() == IntDivOp) {
> X.needs(MDU, MultDivUnit::StartMultDiv);
>
> +++else if (inst->opClass() == IntMultOp || inst->opClass() == IntDivOp ||
> inst->opClass() == FloatDivOp|| inst->opClass() == FloatMultOp ) {
> X.needs(MDU, MultDivUnit::StartMultDiv);
>
> and similar lines in cpu/inorder/resources/mult_div_unit.cc (in functions
> MultDivUnit::getSlot, MultDivUnit::execute and MultDivUnit::exeMulDiv).
>
>
> Kind regards,
>
> Max
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