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archived-llvm/include/llvm/Transforms
Adam Nemet 65ad27f81e [SLP] Emit optimization remarks
The approach I followed was to emit the remark after getTreeCost concludes
that SLP is profitable.  I initially tried emitting them after the
vectorizeRootInstruction calls in vectorizeChainsInBlock but I vaguely
remember missing a few cases for example in HorizontalReduction::tryToReduce.

ORE is placed in BoUpSLP so that it's available from everywhere (notably
HorizontalReduction::tryToReduce).

We use the first instruction in the root bundle as the locator for the remark.
In order to get a sense how far the tree is spanning I've include the size of
the tree in the remark.  This is not perfect of course but it gives you at
least a rough idea about the tree.  Then you can follow up with -view-slp-tree
to really see the actual tree.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302811 91177308-0d34-0410-b5e6-96231b3b80d8
2017-05-11 17:06:17 +00:00
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2017-05-11 17:06:17 +00:00