Help the Compiler

• Eliminate unnecessary function call overhead of small, often-called functions

• Rewrite expressions to help the compiler
  • The original code is

for(i=0; i<N; i++) sum += A[i] * B[i];
• But the compiler may generate faster code if the code is

ptA = A; ptB = B;

for(i=0; i<N; i++) sum += *ptA++ * *ptB++;

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