expression being loop invariant is not equivalent to the property of
properly dominating the loop header.
Other optimizations have also made this optimization less important.
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since they can support trivial implementations. This avoids potentially
expensive traversals of the operands.
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confusing to have different arguments for the same virtual
function at different levels of the class hierarchy.
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std::deque, since this is a stack and only supports push/pop on
one end, and remove an unimplemented declaration.
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eliminate several const_casts.
Make CallSite implicitly convertible to ImmutableCallSite.
Rename the getModRefBehavior for intrinsic IDs to
getIntrinsicModRefBehavior to avoid overload ambiguity with CallSite,
which happens to be implicitly convertible to bool.
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of Value deletions and RAUWs, instead of relying on ScalarEvolution's
Scalars map being notified, as that's complicated at best, and
insufficient in general.
This means SCEVUnknown needs a non-trivial destructor, so introduce
a mechanism to allow ScalarEvolution to locate all the SCEVUnknowns.
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extend it to handle the case where multiple RAUWs affect a single
SCEVUnknown.
Add a ScalarEvolution unittest to test for this situation.
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* contains(Loop), * getOutermostLoop()
* Improve getNameStr() to return a sensible name, if basic blocks are not named.
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that the values they refer to aren't being deleted underneath them.
Make sure these containters get cleared by clear(), which IndVarSimplify
and LSR both use before deleting instructions.
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The RegionInfo pass detects single entry single exit regions in a function,
where a region is defined as any subgraph that is connected to the remaining
graph at only two spots.
Furthermore an hierarchical region tree is built.
Use it by calling "opt -regions analyze" or "opt -view-regions".
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Make MDNode::destroy private.
Fix the one thing that used MDNode::destroy, outside of MDNode itself.
One should never delete or destroy an MDNode explicitly. MDNodes
implicitly go away when there are no references to them (implementation
details aside).
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Determine which loop exit blocks need a 'pre-exit' block inserted.
Recognize when this would be impossible.
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Still very much under development. Comments and fixes will be forthcoming.
(This commit includes some small tweaks to LiveIntervals & LoopInfo to support the splitter)
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