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 |