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ScheduleDAGInstrs: Comment on why subreg defs are not seen as uses; NFC
authorMatthias Braun <matze@braunis.de>
Tue, 10 May 2016 20:11:58 +0000 (20:11 +0000)
committerMatthias Braun <matze@braunis.de>
Tue, 10 May 2016 20:11:58 +0000 (20:11 +0000)
commit014fc128e6c684f90db90a1e3af34f70ee0c951b
tree8b76f6082f717d179e498ada32b6760981b00ad3tree | snapshot
parentdb21c5a5514660c83c26bac4176bcb7601782e19commit | diff
ScheduleDAGInstrs: Comment on why subreg defs are not seen as uses; NFC

Usually subregister definitions are consider uses of the remaining
lanes that did not get defined. Add a comment why the code in
ScheduleDAGInstrs does not add use dependencies regardless.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269107 91177308-0d34-0410-b5e6-96231b3b80d8
lib/CodeGen/ScheduleDAGInstrs.cpp diff | blob | history
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