Omer Zak wrote:
1. How do you ensure that the compiler did not optimize away the
assignment to q or the call to sqrt() due to recognition that it has no
side-effects (in 80x86 processors, there is a FP sqrt instruction so a
serious compiler knows to inline the function call and that it leaves no
side effects)?
2. Why not use q += sqrt(i) in the benchmark (solves the above problems
without special compiler options or obscure pragmas)?
While we're at it, let's also print out the result, to avoid a case
where the compiler notices that q is never used.
Shachar
--
Shachar Shemesh
Lingnu Open Source Consulting ltd.
http://www.lingnu.com/
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