1. [NFC] [LoopPeel] Change the way DT is updated for loop exits (details)
Commit fa16329ae0721023376f24c7577b9020d438df1a by mkazantsev
[NFC] [LoopPeel] Change the way DT is updated for loop exits

When peeling a loop, we assume that the latch has a `br` terminator and
that all loop exits are either terminated with an `unreachable` or have
a terminating deoptimize call. So when we peel off the 1st iteration, we
change the IDom of all loop exits to the peeled copy of
`NCD(IDom(Exit), Latch)`. This works now, but if we add logic to support
loops with exits that are followed by a block with an `unreachable` or a
terminating deoptimize call, changing the exit's idom wouldn't be enough
and DT would be broken.

For example, let `Exit1` and `Exit2` are loop exits, and each of them
unconditionally branches to the same `unreachable` terminated block. So
neither of the exits dominates this unreachable block. If we change the
IDoms of the exits to some peeled loop block, we don't update the
dominators of the unreachable block. Currently we just don't get to the
peeling logic, saying that we can't peel such loops.

With this NFC we just insert edges from cloned exiting blocks to their
exits after peeling each iteration (we accumulate the insertion updates
and then after peeling apply the updates to DT).

This patch was a part of D110922.

Patch by Dmitry Makogon!

Differential Revision:
Reviewed By: mkazantsev
The file was modifiedllvm/lib/Transforms/Utils/LoopPeel.cpp


  1. Fixed tests for FP classification intrinsics (details)
Commit 22d9df15f561874a062d1377101b8133d0082d27 by sepavloff
Fixed tests for FP classification intrinsics

The change contains small fixes and enhancements for these tests:
- previously these tests were run only if the Makefile was created
by running cmake. But the buildbots use configure, so they actually
did not execute the tests. This change fixes this behavior.
- Get rid of some compiler warnings.
- Tests data for NaN values are split into quiet and signaling NaNs
The file was modifiedSingleSource/UnitTests/Float/classify-f32.h (diff)
The file was modifiedSingleSource/UnitTests/Float/classify-f64.h (diff)
The file was modifiedSingleSource/UnitTests/Float/classify-ldouble.h (diff)
The file was modifiedSingleSource/UnitTests/Makefile (diff)
The file was modifiedSingleSource/UnitTests/Float/check-helper.h (diff)