Using -g causes differences in generated core.
For nofib/shootout/fannkuch-redux:
Normal results
> /e/ghc-8.6.1/bin/ghc.exe Main.hs -O2 -XBangPatterns -fforce-recomp -ddump-simpl -dsuppress-all -dsuppress-uniques | less
...
Result size of Tidy Core
= {terms: 2,747, types: 2,736, coercions: 100, joins: 50/73}
...
> /e/ghc-8.6.1/bin/ghc.exe Main.hs -O2 -XBangPatterns -fforce-recomp -ddump-simpl -dsuppress-all -dsuppress-uniques -g | less
...
Result size of Tidy Core
= {terms: 2,654, types: 2,557, coercions: 100, joins: 38/71}
...
There are also structural differences in the generated code.
I've hit the issue with a tree based on head as well so likely happening there as well.
Trac metadata
Trac field | Value |
---|---|
Version | 8.6.2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |