Nikita Popov 332c100562 [ValueTracking][ConstantRange] Distinguish low/high always overflow ...

In order to fold an always overflowing signed saturating add/sub,
we need to know in which direction the always overflow occurs.
This patch splits up AlwaysOverflows into AlwaysOverflowsLow and
AlwaysOverflowsHigh to pass through this information (but it is
not used yet).

Differential Revision: https://reviews.llvm.org/D62463

llvm-svn: 361858

2019-05-28 18:08:31 +00:00

214 KiB

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