[LLVMdev] pseudo lowering

[Reed Kotler]

On 02/17/2013 12:48 PM, Andrew Trick wrote:
> On Feb 16, 2013, at 1:31 PM, Cameron Zwarich <zwarich at apple.com> wrote:
>
>> That's exactly the right place.
> Really? You don't want the expansion to be optimized? You want to specify a machine model for the pseudo's as if they're real instructions? You don't want to schedule or register allocate the real instructions?
>
> -Andy

So then maybe my code should be called during instruction selection?

The very original MIPs port was for Mips I and Mips I has a need for 
lots of psuedos because it's primitive.
That code has mostly been removed now because we don't support Mips I 
which is just an historical processor at this time.

I approach level one implementations of things from the point of view of 
correctness and then make things better as I understand the problem better.

So my base scheme for all of this was to create multi line assembler 
expansion in pseudos.

Now that I'm passing mostly all of test-suite, I'm starting improve things.

At this time, I'm starting to place expansion in

expandPostRAPseudo

Would it be possible to call this same code during instruction selection?

When I emitting the code for certain formats, I would need to call some emitter which basically the same kind of I'm calling from  expandPostRAPseudo now.


>> On Feb 16, 2013, at 1:08 PM, Reed Kotler <rkotler at mips.com> wrote:
>>
>>> I have a bunch of pseudos that I want to lower right after instruction selection.
>>>
>>> Where is the best place to do that?
>>>
>>> I was planning to use expandPostRAPseudo.
>>>
>>> Is there a better place?
>>>
>>> TIA.
>>>
>>> Reed
>>>
>>>
>>>
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