Bulat Ziganshin wrote:
Hello Andrew,
Tuesday, May 20, 2008, 11:05:52 PM, you wrote:
-funbox-strict-fields.
I did try that, but it didn't seem to make any difference for me. [Maybe
it may be that ghc just not recompiled program when you supplied this switch.
Possibly. I notice that adding *some* switches makes GHC recompile everything, while others don't. [It's probably documented in the manual somewhere...]
and, without this switch representation for !Int32 is the same as for Int32 - only difference is that when data is assigned to such field they are evaluated first (and then boxed)
Right, OK - so strict evaluation, but some bitpattern in RAM.
it is not enabled by default, because for *non-primitive* datatypes such as B below automatic unboxing of strict fields of this type may decrease sharing and thus memory/performance.
Yeah, I can imagine...