masahi commented on pull request #7669:
URL: https://github.com/apache/tvm/pull/7669#issuecomment-800584527


   @mbrookhart @tqchen The SPIRV spec says their log2 intrinsics only support 
16 or 32 bit floating point 
https://www.khronos.org/registry/spir-v/specs/1.0/GLSL.std.450.html
   
   `The operand x must be a scalar or vector whose component type is 16-bit or 
32-bit floating-point.`


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