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Author SHA1 Message Date
Michael Kuperstein dd92c78669 [ConstantFolding] Fix vector GEPs harder 
For vector GEPs, CastGEPIndices can end up in an infinite recursion, because
we compare the vector type to the scalar pointer type, find them different,
and then try to cast a type to itself.

Differential Revision: https://reviews.llvm.org/D28009

llvm-svn: 290260
 2016-12-21 17:34:21 +00:00
Keno Fischer dc09119776 ConstantFolding: Don't crash when encountering vector GEP 
ConstantFolding tried to cast one of the scalar indices to a vector
type. Instead, use the vector type only for the first index (which
is the only one allowed to be a vector) and use its scalar type
otherwise.

Fixes PR31250.

Reviewers: majnemer
Differential Revision: https://reviews.llvm.org/D27389

llvm-svn: 289073
 2016-12-08 17:22:35 +00:00
Peter Collingbourne d93620bf4d IR: Introduce inrange attribute on getelementptr indices. 
If the inrange keyword is present before any index, loading from or
storing to any pointer derived from the getelementptr has undefined
behavior if the load or store would access memory outside of the bounds of
the element selected by the index marked as inrange.

This can be used, e.g. for alias analysis or to split globals at element
boundaries where beneficial.

As previously proposed on llvm-dev:
http://lists.llvm.org/pipermail/llvm-dev/2016-July/102472.html

Differential Revision: https://reviews.llvm.org/D22793

llvm-svn: 286514
 2016-11-10 22:34:55 +00:00