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[InstCombine] add/use overflowing math helper functions; NFC

Authored by spatel on Sep 14 2018, 2:30 PM.

Description

[InstCombine] add/use overflowing math helper functions; NFC

The mul case can already be refactored to use this similar to
rL342278.
The sub case is proposed in D52075.

llvm-svn: 342289

Details

Committed
spatelSep 14 2018, 2:30 PM
Parents
rGc68f78d5d86e: [PowerPC] Fix the calling convention for i1 arguments on PPC32
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