ghc produces poor code for `div` with constant powers of 2.
The code for Int (div x c) where c is a constant of the form 2^n^ should be implemented with an arithmetic right shift, currently it's a call to a function. This optimization should be done for all signed types.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.2.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |