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GCC Explorer - an interactive take on compilationGCC Explorer - an interactive take on compilationPosted Jun 3, 2012 5:37 UTC (Sun) by quotemstr (subscriber, #45331)In reply to: GCC Explorer - an interactive take on compilation by vonbrand Parent article: GCC Explorer - an interactive take on compilation
Your transformation isn't valid: consider multithreading. One printf will write to a stream as an atomic operation (enforced by internal stdio locks), but the output from discrete output functions may overlap.
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GCC Explorer - an interactive take on compilation Posted Jun 3, 2012 9:23 UTC (Sun) by dgm (subscriber, #49227) [Link]
That's why a naive coder with a optimizing compiler cannot beat a good coder. The compiler is bound by the precise semantics of the code, even if there are aspects of it that you don't care. The compiler has to care.
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