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and clean up some loose ends.
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than an iteration count.
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have trouble with an intermediate add overflowing. Also, be more conservative
about the case where the induction variable in an SLT loop exit can step past
the RHS of the SLT and overflow in a single step.
Make getSignedRange more aggressive, to recover for some common cases which
the above fixes pessimized.
This addresses rdar://7561161.
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This new version is much more aggressive about doing "full" reduction in
cases where it reduces register pressure, and also more aggressive about
rewriting induction variables to count down (or up) to zero when doing so
reduces register pressure.
It currently uses fairly simplistic algorithms for finding reuse
opportunities, but it introduces a new framework allows it to combine
multiple strategies at once to form hybrid solutions, instead of doing
all full-reduction or all base+index.
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to make more intellegent AddRec folding decisions.
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so that unnamed blocks are handled.
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other files to compensate.
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s/errs/dbgs/g except for certain special cases.
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associative either.
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is not reassociative.
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contains another loop, or an instruction. The loop form is
substantially more efficient on large loops than the typical
code it replaces.
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and ConstantFoldCompareInstOperands.
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individual operands instead of taking a temporary array
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from various APIs, addressing PR5325.
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of the ScalarEvolution pass without needing to #include ScalarEvolution.h.
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clears out more information than just the stored backedge taken count.
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VISIBILITY_HIDDEN removal.
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Chris claims we should never have visibility_hidden inside any .cpp file but
that's still not true even after this commit.
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instructions.
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where the induction variable has a non-unit stride, such as {0,+,2}, and
there are expressions such as {1,+,2} inside the loop formed with
or or add nsw operators.
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SCEVUnknowns, as the non-SCEVUnknown cases in the getSCEVAtScope code
can also end up repeatedly climing through the same expression trees,
which can be unusably slow when the trees are very tall.
Also, add a quick check for SCEV pointer equality to the main
SCEV comparison routine, as the full comparison code can be expensive
in the case of large expression trees.
These fix compile-time problems in some pathlogical cases.
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will always return the same value. This isn't currently necessary,
since this code doesn't currently ever get called under circumstances
where it would matter, but it may some day.
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update all code that this affects.
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and hasNoSignedWrap, for consistency with the nuw and nsw properties.
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by hand, and fix a few places that were using hasInitializer() that
appear to depend on the initializer value.
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TargetData is not present. It still uses TargetData when available.
This generalization also fixed some limitations in the TargetData
case; the attached testcase covers this.
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change back are
metadata related, which I'm waiting on to avoid conflicting with Devang.
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