What do you mean exactly? Writing it in the form of (0.5*x + 0.5) seems like it would map to a MAD instruction, while in the original form it doesn't. MAD does both Multiply and Add in a single instruction, but I the order of operation matters, so doing it in the order of Add then multiply (as in the original form) wouldn't work, at least not without breaking floating point rules.
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why （x+1.0f）*0.5f has optimized way? I think (0.5*x + 0.5) and （x+1.0f）*0.5f both need ADD and MUL Command....
What do you mean exactly? Writing it in the form of (0.5*x + 0.5) seems like it would map to a MAD instruction, while in the original form it doesn't. MAD does both Multiply and Add in a single instruction, but I the order of operation matters, so doing it in the order of Add then multiply (as in the original form) wouldn't work, at least not without breaking floating point rules.