(PromoteAbstractToConcrete), and to use a set to avoid recomputation.
In particular, this set eliminates the potentially exponential cases
from this little recursive algorithm.
On a particularly nasty testcase, llvm-dis on the .bc file went from 34
minutes (which is when I killed it, it still hadn't finished) to 0.57s.
Remember kids, exponential algorithms are bad.
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Move include/Config and include/Support into include/llvm/Config,
include/llvm/ADT and include/llvm/Support. From here on out, all LLVM
public header files must be under include/llvm/.
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- Remove Tabs
- Add inserters needed since Value doesn't implement them any more
- Move some functions here to avoid cyclic header file dependencies.
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this speeds up a release llvm-as from 21.95s to 11.21s, because before it
would do an expensive traversal of the type-graph of every type resolved.
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consistent across the various type classes, we can factor out a LOT more
almost-identical code. Also, add a couple of temporary statistics.
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all of the ad-hoc storage of contained types. This allows getContainedType to
not be virtual, and allows us to entirely delete the TypeIterator class.
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This change speeds up type resolution by checking to see if a type is
recursive, and if it's not, using a more efficient algorithm.
This dramatically reduces bytecode loading time of kc++, reducing time-to-jit
kc++ --version to 17s from 33s
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machinery. This dramatically simplifies how things works, removes irritating
little corner cases, and overall improves speed and reliability.
Highlights of this change are:
1. The exponential algorithm built into the code is now gone. For example
the time to disassemble one bytecode file from the mesa benchmark went
from taking 12.5s to taking 0.16s.
2. The linker bugs should be dramatically reduced. The one remaining bug
has to do with constant handling, which I actually introduced in
"union-find" checkins.
3. The code is much easier to follow, as a result of fewer special cases.
It's probably also smaller. yaay.
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This makes use of the new PATypeHolder's to keep types from being deleted
prematurely, instead of the wierd "self reference" garbage. This is easier
to understand and more efficient as well.
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call setAbstract). Now that we just compute abstractness we can also return
the computed value by value instead of as an argument.
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not correctly calculated, and calculating it wrong for fun seems rather
pointless. This also speeds up my favorite testcase by .25 seconds.
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we need to know anyway. This reduces the 2002-07-08-HugePerformanceProblem.llx
down to 3.210u:0.010s, which is back in the acceptable range again
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Now we're back to: 131.730u, 0.330s, which is still quite an improvement,
but still quite unacceptable
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the type is analyzed. Instead, only compute it when requested (with
getDescription), and cached for reuse later.
This dramatically speeds up LLVM in general because these descriptions almost
_never_ need to be constructed. The only time they are used is when a type is
<<'d. Printing of modules by themselves uses other code to print symbolic
types when possible, so these descriptions are really only used for debugging.
Also, this fixes the particularly bad case when lots of types get resolved to
each other, such as during linking of large programs. In these cases, the type
descriptions would be repeatedly recomputed and discarded even though: A. noone
reads the description before it gets resolved, and B. many many resolutions
happen at intermediate steps, causing a HUGE waste of time.
Overall, this makes the getTypeDesc function much more light-weight, and fixes
bug: Assembler/2002-07-08-HugePerformanceProblem.llx, which went from taking
1048.770u/19.150s (which is 17.5 MINUTES, on apoc), to taking 0.020u/0.000s,
which is a nice little speedup. :)
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* Remove ambiguous code that caused problems with understanding how stuff
worked.
* Implement DerivedType::typeIsRefined right. Add a big comment talking
about it.
* The removeUserFromConcrete method already checks to see if the type is
not abstract, so no need to duplicate the test all over this code
This checkin makes all of the type parsing related failures work. All
Assembler Regression tests now pass!
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That was due to the StructType object not getting called multiple times
to remove itself from the ATU list for an object, because it stopped
getting queried due to this wrong test
* Improve debug output when DEBUG_MERGE_TYPES is on
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* Refactor a bunch of code. Types now only remove one subelement at a time
when they are told that they have changed
* Improve debugging output, add more assertions...
* FIX Bugs:
* test/Regression/Assembler/2002-04-04-PureVirtMethCall.ll
* test/Regression/Assembler/2002-04-04-PureVirtMethCall2.ll
* The change to fix these bugs was the to ValTypeBase::refineAbstractType
method. Basically we #if 0'd out the chunk of code there and make the
table get reorganized EVEN IF the type has the same pointer. Merging
opportunities were being missed!
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* Fix a bug in DerivedType::refineAbstractTypeTo that caused
test/Regression/Assembler/2002-04-05-TypeParsing.ll to fail.
The added comment describes the fix
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1. Forward propogate a loaded constant to make debugging slightly less annoying
2. Fix an extremely nasty hard to find bug that really irritated me for the better
part of 6 hours and was causing linking to die and bizarre and mysterious ways.
Things should be much more stable now that this one liner has been fixed. GRR
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Remove lockty, remove fillerty
Make type lookup more efficient
Support shared generic factory code
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* Convert post to pre-increment for for loops
* Use generic programming more
* Use new Value::cast* instructions
* Use new Module, Method, & BasicBlock forwarding methods
* Use new facilities in STLExtras.h
* Use new Instruction::isPHINode() method
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