Program produces different output when compiled with -O
When compiled and run as
ghc Subtlety.hs
Subtletythe attached program generates the correct output of
Just (Vec3 0.0 0.0 1.0)but when compiled and run using
ghc -O Subtlety.hs
Subtletythe program's output is
Just (Vec3 0.0 0.9805806756909202 0.19611613513818404)Furthermore, subtle changes to the source code (like removing the strictness on the Vec3 type's fields) can alter the behavior of the compiled program.
I am using GHC 7.8.3 x86-64 from Haskell Platform 2014.2.0.0 RC2 on Windows 8.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.8.3 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |