tree b978d8fba715be02c4f33013cc94e12267e2c86c
parent 6e8533b05630a1e06d39a61270dcbf6d0662b3b5
author David Green <david.green@arm.com> 1571758787 +0000
committer David Green <david.green@arm.com> 1571758787 +0000

[InstCombine] Signed saturation patterns

This adds an instcombine matcher for code that attempts to perform signed
saturating arithmetic by casting to a higher type. Unsigned cases are already
matched, this adds extra matches for the more complex signed cases, which
involves matching the min(max(add a b)) nodes with proper extends to ensure
legality.

Differential Revision: https://reviews.llvm.org/D68651


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375505 91177308-0d34-0410-b5e6-96231b3b80d8