Jim, and others (I'm ccing GHC users)
External Core is a feature of GHC that is lonely and unloved. External
Core longs to have someone to look after it, tell it that it is a Truly
Useful Feature, and keep it working.
Seriously, External Core has a strong tendency to bit-rot because (so
far as
| So, my hypothesis is that the inliner doesn't recognise that
| ``if (x = 0) then ...'' is effectively a case analysis on x, and thus
the
| argument discount is not fired. So we need to figure out how to
extend
| this criterion for when to apply the argument discount.
Correct. GHC generates
On Wed, 11 Oct 2006, Simon Peyton-Jones wrote:
Correct. GHC generates
case (x# =# 0#) of { True - ...; False - ... }
But the argument discount only applies when we have
case y of { ... }
So you really want a discount for the args of a primop.
Do you think it should be that
| Do you think it should be that general? I was thinking the discount
| should only apply in the situtation where a case expression contains
an
| expression with one free varaible that is a function argument, and all
| operations are primitive.
Well, if you see
x =# 0
then it'd be good
On Wed, 11 Oct 2006, Simon Peyton-Jones wrote:
The constant-folding rules for the primops are all in
prelude/PrelRules.lhs
in function primOpRules. Please add more rules. For example, I see
that
x +# 0 = x
is not in there!
It is in libraries/base/GHC/Base.lhs
x# +# 0#
Hello Simon,
Wednesday, October 11, 2006, 2:23:59 PM, you wrote:
The constant-folding rules for the primops are all in
prelude/PrelRules.lhs
in function primOpRules. Please add more rules. For example, I see
that
x +# 0 = x
is not in there!
but GHC.Base contains
{-#
===
The (Interactive) Glasgow Haskell Compiler -- version 6.6
===
The GHC Team is pleased to announce a new release of GHC.
There have been many changes since the 6.4.2
Simon Peyton-Jones simonpj at microsoft.com writes:
| So, my hypothesis is that the inliner doesn't recognise that
| ``if (x = 0) then ...'' is effectively a case analysis on x, and thus
the
| argument discount is not fired. So we need to figure out how to
extend
| this criterion for
Hi,
I was just talking yesterday with a group of other students about
using the ExternalCore data type as the starting point for a project
we're starting to work on with the goal of having more practice
implementing various compiler components.
We were also talking about the possibility
On Wed, 11 Oct 2006, Samuel Bronson wrote:
branch. I've got a patch that seems like it ought to do a bettter job,
but it doesn't seem to give the $wrotate functions any discount (the
$wshift functions having been tagged by the {-# INLINE shift #-} pragmas
I added all over). Unfortunately I
Dear GHC hackers,
I would like to experiment with the GHC API. However I get link errors when
using it. For example:
-
$ ghci -package ghc
___ ___ _
/ _ \ /\ /\/ __(_)
/ /_\// /_/ / / | | GHC Interactive,
Interesting. I was unable to reproduce your problem. What platform
are you running on? Are you using a binary distribution or one you
built from source?
Seems like something didn't build right... You might use 'nm' to
examine your libHSCabal.a to see if a similarly named symbol is
Hi,
for Win32 users wanting the latest GHC goodness, a candidate
6.6 installer is now available,
http://haskell.org/ghc/dist/6.6/ghc-6-6.msi
If anyone's willing to download it and kick the tires a bit,
that'd be great. If nothing too egregious shows up, I'm
planning to publish sometime
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