[PATCH] D41903: [ValueLattice] Use union to shave off ptr size bytes from elements.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: reames, anna, davide.

By using a union for Constant* and ConstantRange we can shave off ptr
size bytes off lattice elements. On 64 bit systems, it brings down the
size to 40 bytes from 48 bytes.

Initialization of Range happens on-demand using placement new, if the
state changes to constantrange from non-constantrange. Similarly, the
Range object is destroyed if the state changes from constantrange to
non-constantrange.


https://reviews.llvm.org/D41903

Files:
  include/llvm/Analysis/ValueLattice.h

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