llvm-project.git/llvm/test/Transforms/LoopVectorize/vectorize-once.ll, branch users/nico/python-2

[LV] Disable runtime unrolling for vectorized loops.

2023-01-06T10:56:17+00:00

This patch adds metadata to disable runtime unrolling to the vectorized
loop. If runtime unrolling/interleaving is considered profitable, LV
will interleave the loop directly. There should be no need to perform
runtime unrolling at a later stage.

Note that we already add metadata to disable runtime unrolling to the
scalar loop after vectorization.

The additional unrolling unnecessarily increases code size and compile
time. In addition to that we have several bug reports of unncessary
runtime unrolling for vectorized loops, e.g. PR40961

Compile-time improvements:

  NewPM-O3: -1.04%
  NewPM-ReleaseThinLTO: -0.59%
  NewPM-ReleaseLTO-g: -0.97%

https://llvm-compile-time-tracker.com/compare.php?from=ce1be13a868d0f8afa367975558c1a6175cce33a&to=78bc2e67f22e9e10e61cdb6cdac4bb857d95eb1b&stat=instructions:u

Fixes #40306.

Reviewed By: lebedev.ri, nikic

Differential Revision: https://reviews.llvm.org/D115261

[LV] Convert some tests to use opaque pointers (NFC).

2022-12-19T20:55:44+00:00

[NFC] Port all runlines for LoopVectorize pass tests to -passes syntax

2022-12-05T19:17:30+00:00

[LV] Use variables instead of hard-coded metadata IDs in tests.

2022-08-16T11:21:49+00:00

[SimplifyCFG] TryToSimplifyUncondBranchFromEmptyBlock() already knows how to preserve DomTree

2020-12-16T22:03:49+00:00

... so just ensure that we pass DomTreeUpdater it into it.

Fixes DomTree preservation for a large number of tests,
all of which are marked as such so that they do not regress.

Migrate function attribute "no-frame-pointer-elim"="false" to "frame-pointer"="none" as cleanups after D56351

2019-12-25T00:27:51+00:00

Migrate function attribute "no-frame-pointer-elim-non-leaf" to "frame-pointer"="non-leaf" as cleanups after D56351

2019-12-25T00:05:15+00:00

Revert "Temporarily Revert "Add basic loop fusion pass.""

2019-04-17T04:52:47+00:00

The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552

Temporarily Revert "Add basic loop fusion pass."

2019-04-17T02:12:23+00:00

As it's causing some bot failures (and per request from kbarton).

This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.

llvm-svn: 358546

[Loop Vectorize] Added a separate metadata

2017-08-20T10:32:41+00:00

Added a separate metadata to indicate when the loop
has already been vectorized instead of setting width and count to 1.

Patch written by Divya Shanmughan and Aditya Kumar

Differential Revision: https://reviews.llvm.org/D36220

llvm-svn: 311281