llvm-project.git/llvm/test/Transforms/LoopDataPrefetch/AArch64, branch users/nico/python-2

BlockFrequencyInfoImpl: Avoid big numbers, increase precision for small spreads

2023-10-25T03:27:39+00:00

BlockFrequencyInfo calculates block frequencies as Scaled64 numbers but as a last step converts them to unsigned 64bit integers (`BlockFrequency`). This improves the factors picked for this conversion so that:

* Avoid big numbers close to UINT64_MAX to avoid users overflowing/saturating when adding multiply frequencies together or when multiplying with integers. This leaves the topmost 10 bits unused to allow for some room.
* Spread the difference between hottest/coldest block as much as possible to increase precision.
* If the hot/cold spread cannot be represented loose precision at the lower end, but keep the frequencies at the upper end for hot blocks differentiable.

[SCEV] Fix incorrect nsw inference for multiply of addrec (#66500)

2023-09-18T06:23:10+00:00

SCEV currently preserves the nsw flag when performing an nsw multiply of
an nsw addrec. While this is legal for nuw, this is not generally the
case for nsw.

This is because nsw mul does not distribute over nsw add:
https://alive2.llvm.org/ce/z/mergCt

Instead, we need either both nuw and nsw to be set
(https://alive2.llvm.org/ce/z/7wpgGc) or explicitly prove that the
distributed multiplications are also nsw
(https://alive2.llvm.org/ce/z/wef9su).

Fixes https://github.com/llvm/llvm-project/issues/66066.

[NFC][Py Reformat] Reformat lit.local.cfg python files in llvm

2023-05-17T15:03:15+00:00

This is a follow-up to b71edfaa4ec3c998aadb35255ce2f60bba2940b0
since I forgot the lit.local.cfg files in that one.

Reformatting is done with `black`.

If you end up having problems merging this commit because you
have made changes to a python file, the best way to handle that
is to run git checkout --ours  and then reformat it
with black.

If you run into any problems, post to discourse about it and
we will try to help.

RFC Thread below:

https://discourse.llvm.org/t/rfc-document-and-standardize-python-code-style

Reviewed By: barannikov88, kwk

Differential Revision: https://reviews.llvm.org/D150762

[Transforms] Convert some tests to opaque pointers (NFC)

2023-01-05T11:43:45+00:00

These are all tests where conversion worked automatically, and
required no manual fixup.

[NFC] Port all LoopDataPrefetch tests to `-passes=` syntax

2022-12-07T23:38:45+00:00

[test] Switch to use -passes syntax in various test cases

2022-12-01T20:25:59+00:00

[LoopDataPrefetch] Fix crash when TTI doesn't set CacheLineSize

2022-07-26T05:08:42+00:00

Fix https://github.com/llvm/llvm-project/issues/56681

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D130418

[LoopDataPrefetch] Add missed LoopSimplify dependence for prefetch pass

2021-08-26T13:01:59+00:00

SCEVExpander::expandCodeFor may expand add recurrences for loop with a preheader,
so we should make LoopDataPrefetch dependent on LoopSimplify.
This patch will try to fix : https://bugs.llvm.org/show_bug.cgi?id=43784

Reviewed By: Meinersbur

Differential Revision: https://reviews.llvm.org/D108448

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