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32 C and C++ Source-Level Optimizations Chapter 2
25112 Rev. 3.06 September 2005
Software Optimization Guide for AMD64 Processors
To generalize the example in Listing 8 further for multiple-constant control code, more work may be
needed to create the proper outer loop. Enumeration of the constant cases reduces this to a simple
switch statement.
Listing 9.
for (i...) {
if (CONSTANT0) {
DoWork0(i); // Does not affect CONSTANT0 or CONSTANT1.
}
else {
DoWork1(i); // Does not affect CONSTANT0 or CONSTANT1.
}
if (CONSTANT1) {
DoWork2(i); // Does not affect CONSTANT0 or CONSTANT1.
}
else {
DoWork3(i); // Does not affect CONSTANT0 or CONSTANT1.
}
}