[LLVMdev] asm parser functionality

[Eric Christopher]

On Tue, Nov 12, 2013 at 2:08 PM, reed kotler <rkotler at mips.com> wrote:
> Right now inline assembler just passes through to the assembler if there is
> no direct object emitter.
>
> If there is a direct object emitter, it gets processed in Asm parser and MC
> instructions are produced.
>
> I propose that the initial parsing happen very early and the inline assembly
> code be replaced with a sequence of MachineInstructions in the basic block
> where it occurs.
>
> Then code like constant islands, branch optimization and other things can
> operate better. Right now they have to make lots of pessimistic assumptions
> (or else be plain wrong).
>

By a concrete proposal I'm curious how you see this working? Right now
we don't intermix machine instructions and llvm IR.

-eric

>
>
> On 11/12/2013 01:04 PM, Eric Christopher wrote:
>>
>> A more concrete proposal would be good. I have no idea what you think
>> you mean by this.
>>
>> -eric
>>
>> On Tue, Nov 12, 2013 at 12:48 PM, reed kotler <rkotler at mips.com> wrote:
>>>
>>> It seems that some parts of asm parser should be moved earlier into llvm.
>>>
>>> It should be possible to parse inline assembler and produce a list of
>>> machine instructions that can be merged into the normal instructions of a
>>> basic block.
>>>
>>> This would make many other things be simple to do later.
>>>
>>> This guessing about and adjusting for uncertainty in later code when
>>> inline
>>> assembler is present is for the birds.
>>>
>>>
>>>
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>
>
>