Undocumented cost-centres (.\) using auto-all, and SCC pragma not being honored

15 Feb 2012

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1 When profiling my code with -auto-all, my .prof file names some
sub-expressions with a backslash. Cf. below. What are these?

     e_step
      e_step.ewords
      e_step.\
       e_step.\.\
        e_step.update_counts
      e_step.fwords

My e_step function binds seven expressions inside a let, then uses them in
two ugly nested folds. (Yes, very hackish)  As you can see, three such
expressions are named explicitly (ewords, fwords, and update_counts). But
where are the rest? Further, perhaps the backslashes have something to do
with the lambda expressions I am using in the two nested folds?

2. A related question: I tried using the SCC pragma instead of auto-all. I
added it to all seven expressions inside the let, and to the nested folds.
However, only two showed up in the .prof file! How come?

Thanks
ninestraycats

Dan Maftei

Thomas Schilling

Dan Maftei

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