91e5e85831a5dda31dad2e094fb03f395709843f - platform_external_llvm80

commit	91e5e85831a5dda31dad2e094fb03f395709843f	[log] [tgz]
author	David Majnemer <david.majnemer@gmail.com>	Fri Apr 22 06:37:45 2016 +0000
committer	David Majnemer <david.majnemer@gmail.com>	Fri Apr 22 06:37:45 2016 +0000
tree	f878bfb873ed47ec0f741330e2551b19afcfa716
parent	fdc9ad7da219486d121a57d72d708bad407c043f [diff]

[EarlyCSE] Take the intersection of flags on instructions

EarlyCSE had inconsistent behavior with regards to flag'd instructions:
- In some cases, it would pessimize if the available instruction had
  different flags by not performing CSE.
- In other cases, it would miscompile if it replaced an instruction
  which had no flags with an instruction which has flags.

Fix this by being more consistent with our flag handling by utilizing
andIRFlags.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267111 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IR/InstrTypes.h[diff]
include/llvm/IR/Instruction.h[diff]
include/llvm/IR/Operator.h[diff]
lib/IR/Instruction.cpp[diff]
lib/IR/Instructions.cpp[diff]
lib/Transforms/Scalar/EarlyCSE.cpp[diff]
test/Transforms/EarlyCSE/flags.ll[Added - diff]

7 files changed

tree: f878bfb873ed47ec0f741330e2551b19afcfa716