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Author SHA1 Message Date
Eric Christopher cee313d288 Revert "Temporarily Revert "Add basic loop fusion pass."" 
The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552
 2019-04-17 04:52:47 +00:00
Eric Christopher a863435128 Temporarily Revert "Add basic loop fusion pass." 
As it's causing some bot failures (and per request from kbarton).

This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.

llvm-svn: 358546
 2019-04-17 02:12:23 +00:00
Hiroshi Yamauchi 9364432cec 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

llvm-svn: 312930
 2017-09-11 17:52:08 +00:00