Constant folding in Core could be better
Constant folding in Core is still a bit feeble. For example, when staring at the code for nofib/shootout/k-nucleotide
I saw this expression:
(x +# 8) -# 1
which would be relatively easy to optimise.
The difficulty is knowing where to stop. What about (8 +# x) -# 1
?
Anyway, this ticket is to record the issue. Currently constant folding is done by the built-in RULES in compiler/prelude/PrelRules
.
Trac metadata
Trac field | Value |
---|---|
Version | 7.8.2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |