A few comments:

For such microbenchmarks you need to check the assembler for optimizations. 
The C code probably removed the complete loop.

The Go version and machine architecture is relevant. There were significant 
changes recently, particular with the introduction of SSA (static single 
assignment) for amd64.

Usally for _, x := range <slice/array> is much faster than direct access. 

The difference between array and slice is probably that the slice access 
must read the pointer to the backing array before the actual value can be 
accessed. This step is not required for arrays.

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