Reinstate constant propagation in some form
The new codegen doesn't have a constant propagation pass. This used to be done by the mini-inliner which was ad-hoc at best; instead of the mini-inliner we now have CmmSink
which is much less ad-hoc but doesn't do constant folding or propagation.
This is a regression that will affect performance of things like copyArray#
, so we should fix it before the release.
Trac metadata
Trac field | Value |
---|---|
Version | 7.7 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | highest |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | tibbe |
Operating system | |
Architecture |