Source:

Jacob Sorber

Make existing code run faster, with compiler optimizations.

Compiler Optimization

Examples of Compiler Optimizations

• loop unrolling, splitting, fusion
• function inlining
• precompute values
• reordering operations

Example.

gcc -O2 test.c
clang -O1 test.c

# -O is the optimization option and the trailing number 
# is the optimization level

There are usually ranging of optimization level from O0 to O3. O0 will produce expected result and is the default for -O option

GCC optimization options:

Optimize Options (Using the GNU Compiler Collection (GCC))

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