llvm/test/Transforms/CodeGenPrepare
Hiroshi Yamauchi b6b25740b7 Unmerge GEPs to reduce register pressure on IndirectBr edges.
Summary:
GEP merging can sometimes increase the number of live values and register
pressure across control edges and cause performance problems particularly if the
increased register pressure results in spills.

This change implements GEP unmerging around an IndirectBr in certain cases to
mitigate the issue. This is in the CodeGenPrepare pass (after all the GEP
merging has happened.)

With this patch, the Python interpreter loop runs faster by ~5%.

Reviewers: sanjoy, hfinkel

Reviewed By: hfinkel

Subscribers: eastig, junbuml, llvm-commits

Differential Revision: https://reviews.llvm.org/D36772

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312930 91177308-0d34-0410-b5e6-96231b3b80d8
2017-09-11 17:52:08 +00:00
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