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Many folds in InstCombine are limited to one-use instructions. For
that reason, if the use-count of an instruction drops to one, it
makes sense to revisit that one user. This is one of the most
common reasons why InstCombine fails to finish in a single iteration.
Doing this revisit actually slightly improves compile-time, because
we save an extra InstCombine iteration in enough cases to make a
visible difference.
This is conceptually NFC, but not NFC in practice, because differences
in worklist order can result in slightly different folding behavior.
The regressed tests in or-shifted-masks.ll now require a sequence of
instcombine,early-cse,instcombine to fold fully. D152876 would make
these fold in a single instcombine run again.
Differential Revision: https://reviews.llvm.org/D151807
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Over the past day or so, i've took a large swing at our tests,
and reduced the number of tests that were still using the old syntax
from ~1800 to just 200.
Left to handle: (as it is seen in this patch)
* Transforms/LSR
* Transforms/CGP
* Transforms/TypePromotion
* Transforms/HardwareLoops
* Analysis/*
* some misc.
I think this is the right point to start actively refusing
to honor the old syntax, except for the old tests,
to prevent the old syntax from creeping back in.
Thus, let's add temporary default-off flag,
and if it is not passed refuse to accept old syntax.
The tests that still need porting are annotated with this flag.
Reviewed By: aeubanks
Differential Revision: https://reviews.llvm.org/D139647
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As discussed in D86843, -earlycse-debug-hash should be used in more regression
tests to catch inconsistency between the hashing and the equivalence check.
Differential Revision: https://reviews.llvm.org/D86863
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llvm-svn: 345090
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llvm-svn: 345089
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Summary:
This patch will print out {Counter, Skip, StopAfter} info of all passes which have DebugCounter set at destruction.
It can be used to monitor how many times does certain transformation happen in a pass, and also help check if -debug-counter option is set correctly.
Please refer to this [[ http://lists.llvm.org/pipermail/llvm-dev/2018-July/124722.html | thread ]] for motivation.
Reviewers: george.burgess.iv, davide, greened
Reviewed By: greened
Subscribers: kristina, llozano, mgorny, llvm-commits, mgrang
Differential Revision: https://reviews.llvm.org/D50031
llvm-svn: 345085
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