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18 C and C++ Source-Level Optimizations Chapter 2
25112 Rev. 3.06 September 2005
Software Optimization Guide for AMD64 Processors
Because the odds that the animal name begins with a ‘y’ are comparatively low, it is better to put that
operand first:
if ((*p == 'y') && (strlen(p) > 4)) { ... }
Example 2
In the following code (assuming a uniform random distribution of i), the operands of || are not
arranged for quick expression evaluation because the first operand is not the condition most likely to
be true:
unsigned int i;
if ((i < 4) || (i & 1)) { ... }
Because it is more likely for the least-significant bit of i to be 1, it is better to put that operand first:
if ((i & 1) || (i < 4)) { ... }