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From: Jeremy F. <je...@go...> - 2002-12-05 09:16:14
|
I found the last bug in lazy-eflags, which was preventing most code from
working under memcheck. It turned out it was Tag_Left[124]'s habit of
using %ebp as a temp if there were no other dead registers. It was
crashing when it tried to use %ebp while saving the flags value during
this sequence. I changed it to push/pop some other register, thereby
keeping %ebp unchanged.
Performance is pretty good. --skin=none is now under 10 times slower
than native (for my gcc3 benchmark), and memcheck is another factor of 5
slower (addrcheck is 3-4 times slower, which is worse than I would have
expected).
The patch (62-lazy-eflags) keeps track of the flags in one of three
states: UPD_Simd (the baseblock is up to date), UPD_Real (the CPU's
%eflags is up to date) and UPD_Both (both are current). UPD_Both isn't
terribly useful, because the only instructions which read flags but
don't set them are SETcc and Jcc, and Jcc is always at the end of a
basic block anyway (and SETcc isn't that common).
Even if an instruction doesn't use any flags, if it doesn't set all the
flags it must read the flag state so that no unexpected flag state leaks
into the emulated state. The big problem here is the D flag, which is
stored in the eflags register, but is functionally completely different
from the status registers.
Patch 62 depends on 61-special-d, which factors out the D flag from the
rest, meaning the live state of D is not in eflags. Almost all
arithmetic instructions overwrite all the remaining flags, meaning that
mostly a flags fetch is not needed for instructions which don't
explicitly use flags input. The only common instructions which don't
affect all flags are INC and DEC, and they aren't terribly common as the
first flags-using instruction in a basic block.
I'm thinking a small improvement might be gained by making the CPUs
eflags register the default home between basic blocks. The dispatch
loop can be responsible for saving it in the base block when dropping
out of execution, and chaining means that the dispatch loop isn't hit
all that much. (Hm, just noticed a bug which was sometimes failing to
fetch eflags for instructions which do a partial flags update. Two
interesting points: it didn't seem to affect any programs I tried, but
more interestingly, when fixed it slowed things down a fair bit, which
makes me think long-life eflags might help more than I thought.)
I suspect it would only really help with --skin=none; when there's a
real instrumenting skin in place, the flags will be saved out pretty
regularly anyway, and most flags uses are Jcc, which, thanks to
fast-jcc, mostly don't need the flags to be present in the CPU to work
well.
J
|