There's a very good StackOverflow question which covers this: "When is
memoization automatic in GHC?"[1]. I found it really cleared up the issue
for me.
[1]:
http://stackoverflow.com/questions/3951012/when-is-memoization-automatic-in-...
On Sat, Jun 15, 2013 at 9:13 PM, Clark Gaebel
Yes. In general, GHC won't CSE for you.
- Clark
On Saturday, June 15, 2013, Christopher Howard wrote:
On 06/15/2013 04:39 PM, Tommy Thorn wrote:
There's not enough context to answer the specific question, but lazy evaluation isn't magic and the answer is probably "no".
Tommy
Perhaps to simplify the question somewhat with a simpler example. Suppose you have
code: -------- let f x = if (x > 4) then f 0 else (sin x + 2 * cos x) : f (x + 1) --------
After calculating at x={0,1,2,3}, and the cycle repeats, are sin, cos, etc. calculated anymore?
-- frigidcode.com
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