Lec-27: Question on Code Optimization in Compiler

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[@purpleocean1689]

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[@saurabhdubey9487]

Even i%2 can be changed to i=i+2 in for loop It's a strength reduction and loop invariant I think

[@krishgarg5665]

Great observation

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[@Er.Sunil.Pedgaonkar]

Excellent

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[@lalitkumar8445]

Hi sir, can we shift condition statement from High frequency to low frequency region like u shift if(i%2)? ....bcos next x and y statements execution depends on this condition and in case if we shift it then j loop will not run for each value of i like as usual it was before shifting.

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[@ratnakantahanse2661]

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[@PranjayVats]

In the first loop cant we increment the loop variable 'i' by 2 every time rather than by 1 as we can see we are doing further operations only when i%2 is true and there is no else part. This will also optimize our code as our loop will excecute for N/2 times. But can anyone tell me that if we do that then what kind of optimization would it be?

[@grovestreet9165]

can we optimize this code like this ?? int total_sum=n*(n-1)/2; int u=n/2-1; int num=4*total_sum; int x=num + 5*u*(u+1);; int y=7*(n-1)+ num; cout

[@entire_life]

Sir, Scientific Techanical assistance paper solution!?

[@umernoor4655]

I couldn't understand the option ( C ) Scope of strength reduction.

[@bhojaksmith]

for example: X Multiply by 2 can be swapped with Shift operation (in this case it is multiply by 4, so we can instead replace it with 2 shift operation instead)