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[InstCombine] Add additional sub nsw inference tests; NFC

Description

[InstCombine] Add additional sub nsw inference tests; NFC

nsw can be determined based on known bits here, but currently
isn't.

Details

Committed
nikicMar 20 2019, 2:42 PM
Parents
rL356619: Allow machine dce to remove uses in the same instruction
Branches
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Tags
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