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Editorial Team
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Asked: 2026-06-18T12:49:23+00:00

Looking at the disassembly of a C++ program, I see functions like _Z41__static_initialization_and_destruction_0ii.constprop.221 .

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Looking at the disassembly of a C++ program, I see functions like _Z41__static_initialization_and_destruction_0ii.constprop.221. What does the constprop mean in this case? It appears to be similar in appearance to the isra suffix (and is sometimes combined, e.g. .isra.124.constprop.226), but it means something else.

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  1. Editorial Team

    From source code comments I’ve read – they indicate functions which have been cloned during optimization.

    EDIT: This may be the answer, maybe not.

    Simple constant propagation

    This file implements constant propagation and merging. It looks for instructions involving only constant operands and replaces them with a constant value instead of an instruction. For example:

    add i32 1, 2

    becomes

    i32 3

    NOTE: this pass has a habit of making definitions be dead. It is a good idea to to run a DIE (Dead Instruction Elimination) pass sometime after running this pass.

    SOURCE

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