AMD 250 manual Listing

Software Optimization Guide for AMD64 Processors 25112 Rev. 3.06 September 2005

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.
}
}

32 C and C++ Source-Level Optimizations Chapter 2