On 04/11/2013 06:37 AM, Brandon Allbery wrote: > On Thu, Apr 11, 2013 at 1:38 AM, Christopher Howard > <christopher.how...@frigidcode.com > <mailto:christopher.how...@frigidcode.com>> wrote: > > Hi. For my own learning, I wanted to see how the exp function is > implemented in GHC. I have GHC 7.4.1 source code open, but I'm having > trouble figuring out which file the actual function definition is > in. I see > > expFloat (F# x) = F# (expFloat# x) > > > expFloat# is likely a primop; good luck.... Primops aka primitive > operations are generally implemented in the compiler backend as assembly > language or Cmm code. Untangling that part of ghc makes my head swim. >.> > > -- > brandon s allbery kf8nh sine nomine associates > allber...@gmail.com <mailto:allber...@gmail.com> > ballb...@sinenomine.net <mailto:ballb...@sinenomine.net> > unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
I traced it down some more: I think it eventually goes into the compiler/nativeGen section where it is translated into the platform's native version of the function. On my platform, I think this is the expf function from math.h. (See EXP(3)). I find that to be interesting, because it means you could change the output of your programs by altering your standard library. But I guess there are a lot of things you could change by altering your standard library! -- frigidcode.com
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