contifier bug
Matthew Fluet
fluet@CS.Cornell.EDU
Fri, 23 Feb 2001 11:54:38 -0500 (EST)
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> > The new contifier appears to have a bug (or two). In trying to run it on the
> > kit benchmark, I get an unhandled Option exception during transform when using
> > the Dom contify strategy, and I get an apparently bogus expression when using
> > the CallCont contify strategy. The latter I conclude because the shrinker
> > complains.
>
> O.k. I'll take a look at them.
The transformation code had a small bug in handling uncontifiable sccs;
it's fixed now. Here are the results for kit (using G0 mlton, so the
times are a little high):
contify starting
initReachCallerCallees starting
initReachCallerCallees finished in 1.020
analyzeCall starting
analyzeCall finished in 0.150
analyzeCont starting
analyzeCont finished in 0.180
analyzeDom starting
buildGraph starting
buildGraph finished in 1.360
computeDominators starting
computeDominators finished in 2.860
compute ADom starting
compute ADom finished in 0.040
analyzeDom finished in 4.370
diagnostics starting
functions: 7692
call_cont_dom: 2808 call_cont: 0
call_dom: 548 cont_dom: 329
call: 0 cont: 0 dom: 264
rem_call_cont_dom: 3 rem_call_cont: 0
rem_call_dom: 0 rem_cont_dom: 0
rem_call: 0 rem_cont: 0 rem_dom: 0
diagnostics finished in 0.020
transform starting
transform finished in 27.140
contify finished in 33.260
num functions 3746
num local functions 73593
num primExps 147948
So, 7692 - (2808 + 548 + 329 + 264 + 3) = 3740, but there are 3746
functions after contification. That means there is some group of mutually
recursive functions that couldn't be nested and, all told, they are
preventing 6 functions from being contified. I didn't look at the cps or
the call graphs to see what is really going on.
contify starting
initReachCallerCallees starting
initReachCallerCallees finished in 0.570
analyzeCall starting
analyzeCall finished in 0.190
analyzeCont starting
analyzeCont finished in 0.150
analyzeDom starting
buildGraph starting
buildGraph finished in 1.030
computeDominators starting
computeDominators finished in 2.320
compute ADom starting
compute ADom finished in 0.010
analyzeDom finished in 3.450
diagnostics starting
functions: 3685
call_cont_dom: 37 call_cont: 0
call_dom: 3 cont_dom: 6
call: 0 cont: 0 dom: 1
rem_call_cont_dom: 0 rem_call_cont: 0
rem_call_dom: 0 rem_cont_dom: 0
rem_call: 0 rem_cont: 0 rem_dom: 0
diagnostics finished in 0.000
transform starting
transform finished in 17.460
contify finished in 22.080
num functions 3644
num local functions 57065
num primExps 97883
Here we have: 3685 - (37 + 3 + 6 + 1) = 3638, but there 3644 functions at
the end. Again, 6 uncontifiable functions.
contify starting
initReachCallerCallees starting
initReachCallerCallees finished in 0.420
analyzeCall starting
analyzeCall finished in 0.150
analyzeCont starting
analyzeCont finished in 0.150
analyzeDom starting
buildGraph starting
buildGraph finished in 0.890
computeDominators starting
computeDominators finished in 3.480
compute ADom starting
compute ADom finished in 0.010
analyzeDom finished in 4.440
diagnostics starting
functions: 1620
call_cont_dom: 0 call_cont: 0
call_dom: 0 cont_dom: 5
call: 0 cont: 0 dom: 0
rem_call_cont_dom: 0 rem_call_cont: 0
rem_call_dom: 0 rem_cont_dom: 0
rem_call: 0 rem_cont: 0 rem_dom: 0
diagnostics finished in 0.000
transform starting
transform finished in 28.660
contify finished in 34.210
num functions 1620
num local functions 76116
num primExps 163200
Last pass the 5 cont_dom functions aren't contified. My guess is that one
of the 6 functions was inlined in multiple locations.
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