Commit Graph

8 Commits

Author SHA1 Message Date
Max Kazantsev 7d49a3a816 [LICM] Hoist guards from non-header blocks
This patch relaxes overconservative checks on whether or not we could write
memory before we execute an instruction. This allows us to hoist guards out of
loops even if they are not in the header block.

Differential Revision: https://reviews.llvm.org/D50891
Reviewed By: fedor.sergeev

llvm-svn: 346643
2018-11-12 09:29:58 +00:00
Max Kazantsev 90edc98c58 [NFC] Rename variable
llvm-svn: 341901
2018-09-11 05:10:01 +00:00
Max Kazantsev 6afebe1d30 [NFC] Simplify inner structure of InstructionPrecedenceTracking
Currently it has a set KnownBlocks that marks blocks as having cached
answers and a map FirstSpecialInsts that maps these blocks to first
special instructions in them. The value in the map is always non-null,
and for blocks that are known to have no special instructions the map
does not have an instance.

This patch removes KnownBlocks as obsolete. Instead, for blocks that
are known to have no special instructions, we just put a nullptr value.
This makes the code much easier to read.

llvm-svn: 341531
2018-09-06 09:29:42 +00:00
Max Kazantsev 8a9e059e5c Return "[NFC] Add severe validation of InstructionPrecedenceTracking"
This validation patch has been reverted as rL341147 because of conserns raised by
@reames. This revision returns it as is to raise a discussion and address the concerns.

Differential Revision: https://reviews.llvm.org/D51523
Reviewed By: reames

llvm-svn: 341526
2018-09-06 08:33:02 +00:00
Max Kazantsev c683d643c9 Revert "[NFC] Add severe validation of InstructionPrecedenceTracking" for discussion
llvm-svn: 341147
2018-08-31 00:01:54 +00:00
Max Kazantsev ec9b386820 [NFC] Add severe validation of InstructionPrecedenceTracking
llvm-svn: 341051
2018-08-30 10:26:06 +00:00
Max Kazantsev d3487bdb61 [NFC] Rename map to make the naming consistent
llvm-svn: 341043
2018-08-30 09:24:33 +00:00
Max Kazantsev d3a4cbe153 [NFC] Move OrderedInstructions and InstructionPrecedenceTracking to Analysis
These classes don't make any changes to IR and have no reason to be in
Transform/Utils. This patch moves them to Analysis folder. This will allow
us reusing these classes in some analyzes, like MustExecute.

llvm-svn: 341015
2018-08-30 04:49:03 +00:00