Peter Collingbourne b6e7ff238c Prevent Constant Folding From Optimizing inrange GEP
This patch does the following things:

1. update SymbolicallyEvaluateGEP so that it bails out if it cannot preserve inrange arribute;
2. update llvm/test/Analysis/ConstantFolding/gep.ll to remove UB in it;
3. remove inaccurate comment above ConstantFoldInstOperandsImpl in llvm/lib/Analysis/ConstantFolding.cpp;
4. add a new regression test that makes sure that no optimizations change an inrange GEP in an unexpected way.

Patch by Zhaomo Yang!

Differential Revision: https://reviews.llvm.org/D51698

llvm-svn: 341888
2018-09-11 01:53:36 +00:00
2018-08-09 22:05:19 +00:00
2016-01-26 21:29:08 +00:00
2018-06-18 12:22:17 +00:00
2018-06-08 21:21:55 +00:00

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