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imho
2017 Jan 31
2
[GlobalISel] Questions about selection regions
...t more information in
order to choose optimal patterns.
However, the current global isel implementation still iterates over BBs
within functions, which is same as the original SelectionDAG approach, and
select individual instruction without "peeking" the information of other
basic blocks. IMOO, neither do the overall design nor the individual
instruction selector routines take the "global information" into concern.
Are my observations correct?
Also, are there any examples which show that the current global isel take
information across multiple BBs within a function?
Best Regar...
2017 Jan 31
0
[GlobalISel] Questions about selection regions
...; order to choose optimal patterns.
> However, the current global isel implementation still iterates over BBs
> within functions, which is same as the original SelectionDAG approach, and
> select individual instruction without "peeking" the information of other
> basic blocks. IMOO, neither do the overall design nor the individual
> instruction selector routines take the "global information" into concern.
> Are my observations correct?
It iterates over instructions (within blocks within functions) because
instructions are the "roots" of the selector...