Commit Graph

5 Commits

Author SHA1 Message Date
Joerg Sonnenberger eb812efa12 Explicitly include <cassert> when using assert
Depending on the OS used, a module-enabled build can fail due to the
special handling <cassert> gets as textual header.
2020-03-02 22:45:28 +01:00
Roman Lebedev 9a20c79ddc
[NFC][KnownBits] Add getMinValue() / getMaxValue() methods
As it can be seen from accompanying cleanup, it is not unheard of
to write `~Known.Zero` meaning "what maximal value can this KnownBits
produce". But i think `~Known.Zero` isn't *that* self-explanatory,
as compared to a method with a name.

Note that not all `~Known.Zero` places were cleaned up,
only those where this arguably improves things.
2019-12-03 20:04:51 +03:00
Nikita Popov 7671fc71f6 [KnownBits] Add computeForAddCarry()
This is for D60460. computeForAddSub() essentially already supports
carries because it has to deal with subtractions. This revision
extracts a lower-level computeForAddCarry() function, which allows
computing the known bits for add (carry known zero), sub (carry known
one) and addcarry (carry unknown).

As we don't seem to have any yet, I've added a unit test file for
KnownBits and exhaustive tests for the new computeForAddCarry()
functionality, as well the existing computeForAddSub() function.

Differential Revision: https://reviews.llvm.org/D60522

llvm-svn: 358297
2019-04-12 18:18:08 +00:00
Chandler Carruth 2946cd7010 Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00
Craig Topper b498a23f0e [KnownBits][ValueTracking] Move the math for calculating known bits for add/sub into a static method in KnownBits object
I want to reuse this code in SimplifyDemandedBits handling of Add/Sub. This will make that easier.

Wonder if we should use it in SelectionDAG's computeKnownBits too.

Differential Revision: https://reviews.llvm.org/D36433

llvm-svn: 310378
2017-08-08 16:29:35 +00:00