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Commit 99a6672b authored by Roman Tereshin's avatar Roman Tereshin
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[LowerSwitch][AMDGPU] Do not handle impossible values 

This patch adds LazyValueInfo to LowerSwitch to compute the range of the
value being switched over and reduce the size of the tree LowerSwitch
builds to lower a switch.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D58096

llvm-svn: 354670
parent 70e97163
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