| Issue |
208073
|
| Summary |
llvm-tblgen reg handling speedup
|
| Labels |
tablegen
|
| Assignees |
|
| Reporter |
roman1741941
|
I looked at performance of the two worst offenders (amdgpu register bank emission
and register info). It seems to me that the way to get superregs is very slow.
It creates a bitvector of *all* register classes in a set. Then uses it once
(register bank emission) or a very few times. Perhaps it's meant to be cached,
no idea.
I removed this weirdness and got some very nice speedup (~70x for reg bank
emission, and ~10x for register info).
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