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GPU/CPU have light texture coordinates broken
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Description

System Information
Kubuntu 16.04.3 kernel 4.10, AMDGPUpro 17.50 (legacy opecl)
CPU AMD R7 1700
GPU AMD Rx 480 8gb

Blender Version
Blender 2.79.1-c621832d3d3

Short description of error
I was trying to make an IES light using viewport GPU rendering using drivers, then I noticed different tiles when rendering with GPU+CPU.

Exact steps for others to reproduce the error

  1. open blend file
  2. render with GPU+CPU
  3. setting device to GPU makes a different result that CPU on the viewport