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Author SHA1 Message Date
Chandler Carruth c246a4c973 Disable GVN Hoist due to still more bugs being found in it. There is 
also a discussion about exactly what we should do prior to re-enabling
it.

The current bug is http://llvm.org/PR32821 and the discussion about this
is in the review thread for r300200.

llvm-svn: 301505
 2017-04-27 00:28:03 +00:00
Geoff Berry 85a530fb59 Re-apply "[GVNHoist] Move GVNHoist to function simplification part of pipeline." 
This reverts commit r296872 now that PR32153 has been fixed.

llvm-svn: 300200
 2017-04-13 15:36:25 +00:00
Benjamin Kramer 9528f8c2fb Revert "Re-apply "[GVNHoist] Move GVNHoist to function simplification part of pipeline."" 
This reverts commit r296759. Miscompiles bash.

llvm-svn: 296872
 2017-03-03 14:27:53 +00:00
Geoff Berry 484d756583 Re-apply "[GVNHoist] Move GVNHoist to function simplification part of pipeline." 
This re-applies r289696, which caused TSan perf regression, which has
since been addressed in separate changes (see PR for details).

See PR31382.

llvm-svn: 296759
 2017-03-02 16:16:47 +00:00
Evgeniy Stepanov 95294127d0 Revert "[GVNHoist] Move GVNHoist to function simplification part of pipeline." 
This reverts r289696, which caused TSan perf regression.

See PR31382.

llvm-svn: 290030
 2016-12-17 01:53:15 +00:00
Geoff Berry ca11a1e147 [GVNHoist] Move GVNHoist to function simplification part of pipeline. 
Summary:
Move GVNHoist to later in the optimization pipeline, specifically, to
the function simplification part of the pipeline.  The new pipeline
location allows GVNHoist to run on a function after its callees have
been inlined but before the function has been considered for inlining
into its callers, exposing more opportunities for hoisting.

Performance results on AArch64 kryo:
Improvements:
  Benchmarks/CoyoteBench/fftbench  -24.952%
  spec2006/bzip2                    -4.071%
  internal bmark                    -3.177%
  Benchmarks/PAQ8p/paq8p            -1.754%
  spec2000/perlbmk                  -1.328%
  spec2006/h264ref                  -1.140%

Regressions:
  internal bmark                    +1.818%
  Benchmarks/mafft/pairlocalalign   +1.084%

Reviewers: sebpop, dberlin, hiraditya

Subscribers: aemerson, mehdi_amini, mcrosier, llvm-commits

Differential Revision: https://reviews.llvm.org/D27722

llvm-svn: 289696
 2016-12-14 19:38:22 +00:00