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Runtime of if

Peter Triple X

Hello,
if there is code like

    if (condition) bla = blub;


than the timming can be different if condition is true or false.

How to make timing equal on both path?

Is

   else dummy = blub;


a good idea?

Are there other ways?

Parents
  • 0 in reply to ImPer Westermark

    "an update of the compiler or change of optimization level can completely change the timing."

    It could change even without updating the compiler or adjusting the optimisation.

    eg, just by adding apparently unrelated code, the compiler might change its choice of which variables to optimise into registers...

    So, one more time:

    if this is really important to you, then you must do it in assembler.
    Period.

Reply
  • 0 in reply to ImPer Westermark

    "an update of the compiler or change of optimization level can completely change the timing."

    It could change even without updating the compiler or adjusting the optimisation.

    eg, just by adding apparently unrelated code, the compiler might change its choice of which variables to optimise into registers...

    So, one more time:

    if this is really important to you, then you must do it in assembler.
    Period.

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