[RFC, PATCH 0/3] tree-ssa-tail-merge engine replacement

[mliska <mliska@suse.cz>]

Hello.

It's going to be almost a year Richard advised me to utilize IPA ICF
infrastructure in tree-ssa-tail-merge, currently using value numbering which
is quite hard to maintain.
Following small patch set is kick-off and I am opened for advices. Meanwhile,
I'm going to send statistics about merged basic blocks before/after the patch set.

Patch set can bootstrap on x86_64-linux-pc and survives regression tests.

Thanks,
Martin

mliska (3):
  tree-ssa-tail-merge: add IPA ICF infrastructure.
  Fully remove legacy tree-ssa-tail-merge value numbering
    infrastructure.
  Fix ubsan tests by disabling of an optimization.

 gcc/dbgcnt.def                      |   1 +
 gcc/ipa-icf-gimple.c                | 272 ++++++++++++++++++++++++++++++++----
 gcc/ipa-icf-gimple.h                |  78 ++++++++++-
 gcc/ipa-icf.c                       |  67 +--------
 gcc/ipa-icf.h                       |  14 +-
 gcc/testsuite/g++.dg/ubsan/vptr-1.C |   2 +-
 gcc/testsuite/g++.dg/ubsan/vptr-2.C |   2 +-
 gcc/testsuite/g++.dg/ubsan/vptr-3.C |   2 +-
 gcc/tree-ssa-tail-merge.c           | 212 ++++++----------------------
 9 files changed, 377 insertions(+), 273 deletions(-)

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2.4.5