Commit 3eb443b6 authored by dterei's avatar dterei
Browse files

Fix comment in CgMonad

parent 5239074b
......@@ -299,12 +299,11 @@ data HeapUsage =
}
\end{code}
The heap high water mark is the larger of virtHp and hwHp. The latter is
only records the high water marks of forked-off branches, so to find the
heap high water mark you have to take the max of virtHp and hwHp. Remember,
virtHp never retreats!
Note Jan 04: ok, so why do we only look at the virtual Hp??
virtHp keeps track of the next location to allocate an object at. realHp keeps
track of what the Hp STG register actually points to. The reason these aren't
always the same is that we want to be able to move the realHp in one go when
allocating numerous objects to save having to bump it each time. virtHp we do
bump each time but it doesn't create corresponding inefficient machine code.
\begin{code}
heapHWM :: HeapUsage -> VirtualHpOffset
......
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