[LLVMdev] LLVM Instruction selection matcher

[محمد ﻋﻤﺮ ﺩﻫﻠﻮﻯ]

On a related note: Is there any documentation on the DAG state machine ?

On Sat, Mar 31, 2012 at 1:33 PM, محمد ﻋﻤﺮ ﺩﻫﻠﻮﻯ <omerbeg at gmail.com> wrote:

>
> I have a few questions about matching in the selector.
> 1. Why does the size of the MatcherTable greatly exceed the number of
> patterns defined in the target description? If it simply contains all the
> variants of the patterns then what is the encoding of these entries ?
> 2. Is there a simple way to extract the root opcode of a pattern from the
> MatcherTable entry ?
> 3. I believe the entries in the MatcherTable are ordered by some measure
> of cost. What exactly does the cost represent and can it be retrieved while
> the selector runs ?
>
> -Omer
>
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