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Constant Propagation Constants assigned to a variable can be propagated through the flow graph and substituted at the use of the variable. Example: In the code fragment below, the value of x can be propagated to the use of x. x = 3; y = x + 4; Below is the code fragment after constant propagation and constant folding. x = 3; y = 7; Notes: Some compilers perform constant propagation within basic blocks; some compilers perform constant propagation in more complex control flow. Some compilers perform constant propagation for integer constants, but not floating-point constants. Few compilers perform constant propagation through bitfield assignments. Few compilers perform constant propagation for address constants through pointer assignments. © 1990-2012 Nullstone Corporation. All Rights Reserved.