Strictness is not preserved under -O1
With -O0, the attached code prints:
> /usr/local/ghc/ghc-8.4.1.0/bin/ghc -O0 src/foo.hs; and ./src/foo
[1 of 1] Compiling Main ( src/foo.hs, src/foo.o ) [Optimisation flags changed]
Linking src/foo ...
("exec",0)
("depth",0)
("exec",1)
("depth",0)But with -O1, it prints:
> /usr/local/ghc/ghc-8.4.1.0/bin/ghc -O1 src/foo.hs; and ./src/foo
[1 of 1] Compiling Main ( src/foo.hs, src/foo.o )
Linking src/foo ...
("depth",0)
("depth",0)Reproduced with 8.4.1 and 8.6.2. Doesn't seem to happen under 8.2.0
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.4.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | me@alang.ca |
| Operating system | |
| Architecture |