[LLVMdev] Min and max

[Nicolas Capens]

Hi all,

 

I'm trying to implement a floating-point 'min' and 'max' operation using
select. For 'min' I get the expected x86 assembly minss instruction, but for
'max' I get a branch instead of maxss.

 

The corresponding C syntax code looks like this:

 

float z = (x > y) ? x : y;

 

Any clues?

 

Could someone maybe explain to me the basics of LLVM's target specific
optimizations and code generation? I'd love to analyze things like this
myself but I don't know where to start.

 

Thanks,

 

Nicolas Capens

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