Core top-level bindings no longer deduplicated
This module
module Two where
f :: Int -> Int
f n = n + 1 + 1
g :: Int -> Int
g n = n + 1 + 1used to (in 8.0) optimize to a definition of g plus f = g. The Common sub-expression phase noticed f and g were equal.
That doesn't happen any more in HEAD and we end up with two copies of the code. The Common sub-expression pass apparently still runs, it just doesn't succeed in removing one of the bindings.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | high |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |