tree fa8498ec24832b84d92bc1e1cf8561ad41496727
parent 467514942a5076757f238930fae0a7a6e9004af2
author Roman Lebedev <lebedev.ri@gmail.com> 1571600215 +0000
committer Roman Lebedev <lebedev.ri@gmail.com> 1571600215 +0000

[ConstantRange] makeGuaranteedNoWrapRegion(): `shl` support

Summary:
If all the shifts amount are already poison-producing,
then we can add more poison-producing flags ontop:
https://rise4fun.com/Alive/Ocwi

Otherwise, we should only consider the possible range of shift amts that don't result in poison.

For unsigned range not not overflow, we must not shift out any set bits,
and the actual limit for `x` can be computed by backtransforming
the maximal value we could ever get out of the `shl` - `-1` through
`lshr`. If the `x` is any larger than that then it will overflow.

Likewise for signed range, but just in signed domain..

This is based on the general idea outlined by @nikic in https://reviews.llvm.org/D68672#1714990

Reviewers: nikic, sanjoy

Reviewed By: nikic

Subscribers: hiraditya, llvm-commits, nikic

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69217

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375370 91177308-0d34-0410-b5e6-96231b3b80d8