On 17.03.2012 01:51, wren ng thornton wrote:
On 3/16/12 12:22 PM, Aleksey Khudyakov wrote:
Disclaimer. I'm no expert in text internals.
Because it's told to do so. This is an unfortunate feature of stream
fusion. It does eliminate intermediate data structures but it requires
that everything is inlined.
There are ways of mitigating that, however. In particular, the standard
style is to have things inline aggressively before stage 0 or 1, and then
in the last stage to "inline" things back to an indirect call to the
library. This is used ubiquitously in GHC's list fusion, and is essential
for stream-fusion since the intermediate stream form is a pessimation when
it can't partake in fusion.
I've checked source. Many functions have RULES to remove unfused
strings. pack however doesn't
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