TMS320F280049: " if (A < B) " consumes 10~13 system clocks

Compile with optimization --opt_level=2 or higher.  B must be converted to a float before the comparison to A.  Consider the speed of the memory that holds A, B, and the instructions.  If those suggestions do not help, then for the source file that contains this comparison, please follow the directions in the article How to Submit a Compiler Test Case.

Thanks and regards,

-George

Thanks, George. Actually I found even with:  int A, B;

• " if (A < B) " still consumes 8  system clocks with Compile  optimization --opt_level=3
• " if (A < B) " still consumes 9  system clocks with Compile  optimization --off

how many system clocks are consumed for such a simple comparison on your side?

Context matters.  Are A and B local variables, global variables, parameters to a function?  What is being controlled by the if?  A return, a single statement, a block of statements?  The best way to answer these questions is by submitting a test case.  And the best way to submit a test case is to please follow the directions in the article How to Submit a Compiler Test Case.

Thanks and regards,

-George

Thanks, Geroge.  Please see below:

1. Both A and B are global variables: both are int.

2. the "if" statement " if (A < B) " controls a single statement

in such a scenario, how many system clocks is " if (A < B) " supposed to be consume?

I only know one way to answer the question ...

Quentin Fu said:

how many system clocks is " if (A < B) " supposed to be consume?

Please submit the test case I have requested.  I'll build it down to assembly code, then tell you how many clock cycles it takes.

Thanks and regards,

-George