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SSA IR

A compiler's internal representation where every variable is assigned exactly once, making code easy to analyze and optimize.

Static Single Assignment form rewrites code so each variable has a single definition, with special merge nodes where control flow joins. This makes it far easier for a compiler (or JIT) to track how values flow and to apply optimizations. A JIT with a custom SSA IR uses this form as the workbench where it analyzes and speeds up code before emitting machine instructions.

See also

  • SIMDA CPU technique that applies one instruction to several pieces of data at once for speed.
  • SPIR-VThe compiled binary format that Vulkan shaders are shipped in, independent of any GPU or source language.

Referenced by

SPIR-V